Swap Not Working

Mar 1, 2008

i want to know why the swap in the server didn't work he is always 208k used

see my top status

top - 09:41:51 up 4 days, 12 min, 2 users, load average: 2.05, 3.11, 3.33
Tasks: 185 total, 2 running, 181 sleeping, 2 stopped, 0 zombie
Cpu(s): 0.7% us, 1.0% sy, 1.6% ni, 92.4% id, 4.3% wa, 0.0% hi, 0.0% si
Mem: 4148808k total, 4008248k used, 140560k free, 117488k buffers
Swap: 2096440k total, 208k used, 2096232k free, 3016032k cached

cat /etc/fstab

LABEL=/ / ext3 defaults,usrquota 1 1
LABEL=/boot /boot ext3 defaults 1 2
none /dev/pts devpts gid=5,mode=620 0 0
none /dev/shm tmpfs noexec,nosuid 0 0
LABEL=/home /home ext3 defaults,usrquota 1 2
none /proc proc defaults 0 0
none /sys sysfs defaults 0 0
LABEL=/tmp /tmp ext3 defaults 1 2
LABEL=/usr /usr ext3 defaults,usrquota 1 2
LABEL=/var /var ext3 defaults,usrquota 1 2
LABEL=SWAP-sda7 swap swap pri=0,defaults 0 0
/dev/sdb1 /hdd1 ext3 defaults,usrquota 0 0
/tmp /var/tmp ext3 defaults,bind,noauto 0 0
/dev/hdb /media/cdrecorder auto pamconsole,exec,noauto,managed 0 0
/dev/scd0 /media/cdrom auto pamconsole,exec,noauto,managed 0 0

My box

WHM 11.15.0 cPanel 11.18.1-R20683
CENTOS Enterprise 4.6 i686 on standard - WHM X v3.1.0

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Run Out Of Swap

Apr 19, 2009

What would cause a Linux server to run out of swap? Would it be a memory leak? This happened today to my server and it had to be forcefully rebooted by the data center.

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Swap Not Being Used

Apr 25, 2008

My server load is up to 20 sometimes, all RAM is used but only a very little SWAP is used (never go above 3M). IOwait is also very high

top - 09:55:33 up 94 days, 3:35, 2 users, load average: 19.09, 9.43, 6.18
Tasks: 327 total, 2 running, 325 sleeping, 0 stopped, 0 zombie
Cpu(s): 38.0% us, 2.0% sy, 0.0% ni, 0.0% id, 59.5% wa, 0.0% hi, 0.5% si
Mem: 2056272k total, 2034064k used, 22208k free, 47516k buffers
Swap: 1052248k total, 3572k used, 1048676k free, 800656k cached

I tried swapoff, mkswap and swapon but it is still the same.

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Swap Used At 100%

Jul 6, 2007

do i need to upgrade my server if it looks like this?

I have one website running on it.

*sign* I'm not really sure why it's running like this.

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High Swap

Mar 31, 2009

I've got a dedicated with LW.

I've had it for a while and during that time I've never seen the swap memory go over 20%.

A month or so ago, I had the server upgraded to 8GB of ram to make room for more planned sites.

Since then, the swap memory has gone rampant. It regulary goes to 93% used with less than 20% of the regular ram and really no load on the server.

I've contacted support twice about it and was told don't worry it's normal.

From what I've read in the cpanel forum, no it's not normal and may in fact be caused by bad ram chips and if it hits 100% could freeze the server.

There are no processes or users causing it, so It's something else.

Has anybody had this type of problem that they resolved and could share what they did to resolve it?

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CPanel - Swap Used 100%

Jul 22, 2008

My swap is currently at 100% and my website isnt loading. What does swap mean and is this the reason my site isnt loading?

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Why Do PHP Caches Use Swap

Feb 20, 2008

Opcode caches have stability problems with some PHP apps:


I've been trying to get XCache working with gallery2, right now apache has to restart every 2-4 hours but it's been worse at times and it'd be nice to know what's going on

I noticed that both XCache and eAccel use a small amount of swap space all the time, it grows slowly and if I'm lucky enough to go without a segfault it will reach maybe 4MB. That's not a lot but it doesn't happen at all without a PHP cache (swap stays locked at 72kb unless RAM runs out and the server thrashes).

Here's the error and my settings:

[Tue Feb 19 06:19:55 2008] [error] PHP Warning: Invalid argument supplied for foreach() in /home/cityv4/public_html/gallery/modules/customfield/classes/CustomFieldHelper.class on line 233
[Tue Feb 19 06:19:55 2008] [error] PHP Warning: Invalid argument supplied for foreach() in /home/cityv4/public_html/gallery/modules/customfield/classes/CustomFieldHelper.class on line 233
[Tue Feb 19 06:19:56 2008] [notice] child pid 31028 exit signal Segmentation fault (11)
[Tue Feb 19 06:19:56 2008] [notice] child pid 10638 exit signal Segmentation fault (11)


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CPanel - Swap Used 100%

Jul 22, 2008

My swap is currently at 100% and my website isn't loading. What does swap mean and is this the reason my site isn't loading?

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RAID 1 Swap

Oct 28, 2007

I have two servers, HP RAID and DELL RAID.

Both controllers are set to RAID 1

I want to take the 2 HD from HP, and put into Dell.

Would this ruin my HD? Will I break the RAID and all my files be lost?

How can I achieve this without loosing my files?

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Swap Space For VPS

Oct 1, 2007

I have purchased several VPS from a provider and found they do not provide swap space with VPS, and even with 256MB ram, I get 'out of memory' trying to compile a perl library... Creation of a swap file by myself doesn't work (operation is not permitted).
Hosting providers runs HyperVM.

So the question. Is it common or is it a misconfiguration? For now I got just 'checking on this for you' and three days of silence from their support.

I'm not opening hosting provider name, but I will if they say "You must pay for more RAM", just because other 5 VPS providers support my VPS servers with swap space.

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Xen And The Issue Of Swap

Jun 4, 2007

I have talked with the moderators and they have agreed that I can start a new thread to clarify the issue of Xen and swapping as long the discussion remains technical.

For people who are curious, I would first like to explain why this is important. What we have here is someone making a specific technical accusation against Xen, and if it is indeed crucial, it needs to be solved, or otherwise people have to know it before they get into Xen.

Claim Number 1: The original claim is that users can create arbitrarily large swap and this can lead to the equivalent of overselling.

Fact: Arbitrarily large swap has absolutely zero effect on a normal system, since Linux treats swap as an auxiliary storage, and will not use it unnecessarily. Linux will always use the RAM to the full, but swap is used only when all the buffers have been cleared. If you run free on a dedicated hardware, you will see that swap usage is most of the times zero, even though you have assigned a very large swap to the system. In fact, you can try this by simply increasing the swap to very huge value, you will see that Linux will ignore it completely.

For large swap to cause a problem, the user not only has to assign a large swap, he has to run a really huge workload on his limited RAM, and this being physically impossible, will cripple his vps long before it has any serious impact on the host.

I think the above has been agreed to by the person who made the initial claim.

Claim Number 2 Merely having a swap can lead to vps getting slowed down.

Fact ; The use of swap does not mean thrashing .

Thrashing is a technical term, and it means that the application is registering a swap hit every few instructions. This is rare in normal systems, because of a property of programs that execution is always localized. That is, at any particular time, a certain portion of the program will be continuously being executed, and other portions would be idle. Linux has algorithms that will swap out the Least Recently Used page, and this will mean that the system will not run into too many swap hits.

Now again, like in the earlier case, there will be trouble if the vps customer is trying to run a 1GB workload in a 64MB RAM. This will actually cripple his vps, which is what's the right thing to happen. So normal usage of Swap will not lead to disk I/O, since Linux has explicit algorithms to reduce swap usage.

So for minor OverUsage of memory:

For virtuozzo: the application will crash

For Xen: there will be a very minor degradation of quality. And sometimes it won't have any affect at all, since as I said, just because swap drive is non-empty doesn't mean that linux is constantly swapping out.

So summarizing:

a) Inordinately large swap has zero effect on Linux

b) Non-empty swap doesn't mean that the system is registering swap hits. For normal workloads, the swap hits will be very minimal.

And an extra advice is that if you are using Xen, don't ever use snapshoting, as it will double the disk I/O, and the worst thing is that the vps that's causing this will not even be penalized. The overhead will be completely borne by the system.

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To Swap Or To Burst

May 11, 2007

I'm planning to get a small VPS (128 MB).

I've come across a XEN based plan that offers additional 256MB swap space, and a few others Virtuozzo based plans that offer bursting capability (some even upto 8GB).

Which would be the better option?

Also, in Virtuozzo, will SLM allocation be significantly more beneficial than UBC for a small VPS?

Another question ... DirectAdmin officially claims to be able to run on a minimum of 64MB RAM. How would it perform on a 128 MB VPS ?
I'm not really looking to do much, only to host a few (5-6) small sites along with some other non-webhosting applications (which is the reason for getting a VPS instead of a reseller).

I've seen most people suggest atleast 256MB for DirectAdmin, but that is beyond my budget. (I'm also seriously considering the option of employing vi as a control panel to further conserve my limited resources)

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Server Way Too Eager To Swap

Mar 30, 2009

I have a handful of machines running Rails on CentOS 5, each with 8GB RAM. They're monitored with Nagios, so I get paged if we exceed 80% memory usage usage or 2% swap. FWIW, they're primarily dual x. dual-core Opterons, and we're using PAE.

The problem is that I keep getting paged in the middle of the night for situations where we're using 2-20% swap yet there are still several gigs of RAM free.

On some level, this makes sense -- if nothing is using a big chunk of RAM, we might as well move it out to disk. On the other hand, when there's still several gigs of RAM free, I don't see any point in bothering, especially when it causes me to get paged at 2am.

So my question is threefold:

Is there any easy way to see what's using swap? top can be made to show a swap column, but it's not what you'd think it is. (For example, most processes show as using lots of swap, and the sum vastly exceeds the actual size of our swap partition.) Can I get a list of what processes are actually swapped out to disk?

Is this a problem other people have? Are others just less aggressive in getting alerted at swap usage, or does this not happen to other people? Our setup is probably not too common (Opterons, PAE, adn 8GB on an older CentOS release?), which makes me think there's a small chance a bona fide bug plays into this somehow.

Is this a case for playing with the swappiness sysctl to make the machine less obsessed with swapping things out to disk? And if so, is there any good documentation on what the 0-100 value actually means, beyond the one sentence explaining that 100 is most likely to swap and 0 is least? Does the current setting of 60 "mean" anything, for example? 98% of the stuff online is just a mirror of the e-mail thread in which Andrew Morton and others go back and forth about what setting is ideal, which doesn't help and is tiring to read over and over.

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May 19, 2009

I've never needed or used swap, but I justed noticed i have 523k of it, which i'm guessing happened when I restored a big CPanel account.

Anyway, is their a correct way to restore it? I've got the memory space, and I've vm.swappiness set to 0.

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Apr 19, 2009

if there is any specific way (maybe logs) to see what is using the swap memory of a dedicated server..

its a server with 8GB ram.. it has 60% of memory used, and a constant swap memory usage of 30%.. i thought that in normal conditions swap memory was not used..

its a centos / cPanel/WHM based server

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Feb 18, 2007

i have a problem with my server it is a Xeon with 2Gb ram, i have a igh swap usage and when it reach the size of 4gb that i have set it go in kernel panic, this is the actual value

top - 14:19:47 up 1 day, 23:07, 1 user, load average: 1.74, 1.93, 1.89
Tasks: 223 total, 5 running, 217 sleeping, 1 stopped, 0 zombie
Cpu(s): 39.8% us, 6.6% sy, 14.0% ni, 32.3% id, 7.3% wa, 0.0% hi, 0.0% si
Mem: 2074640k total, 1980804k used, 93836k free, 66200k buffers
Swap: 4192924k total, 1735588k used, 2457336k free, 365136k cached

total used free shared buffers cached
Mem: 2026 1877 148 0 61 306
-/+ buffers/cache: 1509 516
Swap: 4094 1699 2394

maybe i can work on KeepAlaive setting?

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Dec 2, 2007

Up to now we've been using CentOS with SCSI/SATA disk shich weren't "hot swap", and now we're upgrading to a Dell PowerEdge 1950 revision III with SAS hot swap disks on a PERC RAID 6i (new model of raid controller from Dell).

OF COURSE, Dell ONLY supports Windows (and Red Hat at the very most on the Linux world) so we were told by a Microsoft Tech that to be able to extract a disk and replace with another it had to be done via software. (The software powers the disk down and then you replace it)

Does anyone use CentOS with hot swap SAS disks? Do you use any special software to monitor the disks and/or replace them?

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High Swap Usage

Jan 20, 2007


total used free shared buffers cached
Mem: 1034060 1004864 29196 0 50756 340272
-/+ buffers/cache: 613836 420224
Swap: 1020088 373648 646440

Is there anything I can do to reduce the swap usage?

Running cpanel, Dual Xeon 3.0ghz with 1 gb ram


root@****** [~]# uname -a
Linux ****** 2.6.9-42.0.3.EL.cernsmp #1 SMP Fri Oct 6 12:07:54 CEST 2006 i686 i686 i386 GNU/Linux

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Linux Swap On A Second Hdisk

Jan 2, 2007

I have a second Hdisk on my system, is it okay to sent the tmp swap file folder for the main drive on the second drive? This idea is to lower the disk access and stress of the main hdisk... i have 3gigs of ram and from what i'm reading i should have 6 gigs of swap in which i'm creating 6 swap files 1gig per file.

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Aug 7, 2007

We're about to buy a Dell Poweredge 1950 with hot swap disks in a raid 1 configuration (might even think about other raid combinations).

We will be installing Centos 5 (never tried it - normally use Centos 4) + control panel

The question is: what happens when a disk fails? How do we find out?(Apart from looking at the server) Any software notices?

Once noticed, what is the standard procedure to replace the disk? (Remember they are "hot swap") Do you just pull one out and replace it? Surely you have to rebuild the array...

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May 23, 2007

When is a good time to add more ram?

Since I got my server its ran with 1gb ram and has kept a free of at least 400mb since that time.

Now withing a few hours all of it is being kept in buffer/cache as the past week an showing about 15mb free (not counting buffer/cache) and has started in on the disk swap of about 400Kb.

So should I upgrade to 2gb now or wait till it goes deeper into the swap, and if so how far into the swap before you'd upgrade?

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Server Sucking Up Memory And Using Swap

Jan 25, 2007

I have a server that I have had for a little while now that was runnning perfectly fine. All of the sudden it started just using up a ton of the memory and started using up swap. This has caused the server to slow down and e-mail to stop working. I would upgrade to more memory but I suspect it is someone on the server doing something they shouldn't be. My only reasoning for this is due to the fact that this problem just suddenly arised. I cannot for the life of me determine where this ram usage is coming from.

Here are a few of the errors I have recently got just while logging in..

RIGHT after logging in...
id: cannot find name for group ID 0
id: cannot find name for user ID 0
[root@www root]# top
top: Unknown terminal "xterm" in $TERM
[root@www root]# killall -9 spamd
bash: /usr/bin/killall: Too many open files in system

I have added 2 screen shots as well. First one (top1) is what happens once I can get the command "top" to actually run (normally takes quite a few tries). Second attachement (top2) is after I sorted by mem usage...

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Server Hang - No Free Swap

Mar 24, 2008

I encounter this problem in one of my server today..

Memory is 99% used
Swap is 100% used

top - 20:50:53 up 2 days, 7:05, 2 users, load average: 69.58, 41.63, 24.91
Tasks: 397 total, 57 running, 334 sleeping, 1 stopped, 5 zombie
Cpu(s): 1.9% us, 96.5% sy, 0.1% ni, 0.0% id, 0.0% wa, 0.5% hi, 1.0% si
Mem: 2076300k total, 2027140k used, 49160k free, 1116k buffers
Swap: 5245212k total, 5245212k used, 0k free, 13108k cached

Over my KVM, it just hang. When I try to type something, it shows this on the KVM screen:

[17379796.260000] HighMem 59*4kB 3*8kB 0*16kB 0*32kB 0*64kB 1*128kB 1*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 664kB
[17379796.260000] Swap cache: add 6615861, delete 6615849, find 2695269/27558673, race 0+86
[17379796.260000] Free swap = 0kB
[17379796.260000] Total swap = 5245212kB

Based on the message on screen, what is the message telling me?

[17379796.260000] HighMem 59*4kB 3*8kB 0*16kB 0*32kB 0*64kB 1*128kB 1*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 664kB
[17379796.260000] Swap cache: add 6615861, delete 6615849, find 2695269/27558673, race 0+86

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Why Is Taking Swap If My Server Still Have Free Ram

Apr 14, 2008

Look this:

root@empresarios [~]# free -m
total used free shared buffers cached
Mem: 2017 1966 50 0 20 1054
-/+ buffers/cache: 892 1125
Swap: 2000 1378 621

U know more than me, but why my dedicated server is taking Swap if as u cann se still have 50 Mb free of RAM?

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Ntp Is Set; High Load; Full Swap

Jun 6, 2008

I was getting high load on one of our test machines -- it was high enough to where I couldn't ssh in. However, I happened to have a shell open at the time with top running. Load was very high and swap was full. -- afterwards, when I check /var/log/messages it looks as if the load affected the time (see below).

1) At first I was guessing that the load somehow affected the clock, but you'd think it would slow it down -- but apparently the pace of time was quicker?

2) perhaps the time was wrong in the first place - then upon reboot, ntp sync'd up properly.

3) time was originally correct but after the high load, it somehow erroneously sped up the ticks

Then again, from googling around someone on another forum was saying that the computer clock chip shouldn't ever be affected.

So my question isn't about what cause the load, but why was there a time descrepancy in /var/log/messages, and was it related to the load?

from top:

top - 17:52:32 up 246 days, 23:34, 1 user, load average: 76.52, 75.68, 68.79
Tasks: 192 total, 62 running, 129 sleeping, 0 stopped, 1 zombie
Cpu(s): 0.0% us, 99.5% sy, 0.0% ni, 0.0% id, 0.0% wa, 0.2% hi, 0.2% si
Mem: 3376168k total, 3281060k used, 95108k free, 256k buffers
Swap: 4192956k total, 4192956k used, 0k free, 95656k cached

from /var/log/messages:

Jun 5 17:34:44 staging kernel: Out of Memory: Killed process 26522 (oracle).
Jun 5 17:41:45 staging sshd(pam_unix)[25223]: session closed for user gin
Jun 5 17:09:50 staging syslogd 1.4.1: restart.

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RHEL Installation Without A Swap Partition, Anyway To Fix It

Oct 27, 2007

My data center happen to install RHEL 4 without a swap partition

Is there anyway to fix it without an OS reload?

Linux OS:
[root@server2 log]# uname -a
Linux 2.6.9-55.0.9.ELsmp #1 SMP Tue Sep 25 02:17:24 EDT 2007 i686 i686 i386 GNU/Linux
[root@server2 log]#

Kernel Version(uname -r)
[root@server2 log]# uname -r
[root@server2 log]#
Hardware Information
Clovertown with quad core , dual thing.
4 gb ram.

Control Panel(if any)

[root@server2 sbin]# df -l
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda5 75505212 37384684 34285012 53% /
/dev/sda1 101086 17347 78520 19% /boot
none 2074560 0 2074560 0% /dev/shm
/dev/sda3 25197252 80800 23836476 1% /tmp
/dev/sda2 40313996 7249168 31016944 19% /var
/tmp 25197252 80800 23836476 1% /var/tmp
[root@server2 sbin]#

[root@server2 sbin]# fdisk -l

Disk /dev/sda: 146.8 GB, 146815733760 bytes
255 heads, 63 sectors/track, 17849 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 5112 40957717+ 83 Linux
/dev/sda3 5113 8299 25599577+ 83 Linux
/dev/sda4 8300 17849 76710375 5 Extended
/dev/sda5 8300 17849 76710343+ 83 Linux
[root@server2 sbin]#

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Lighttpd - 95% Cpu Usage. Apache - All Ram Used, Swap Comes In

Oct 9, 2007

I've hired *name* to take care of my server, but it's just getting so frustrating, as it seems they can't fix my server/optimize it correctly.

I just want some input as to what the problem is here.

I got them to install lighttpd along with xcache.

After about 15-18 hours, the server's CPU slowly increases to be using 90-90%, giving me the 500 Internal Server Error.

I've asked them to optimize xcache and lighttpd, but I keep getting these responses:


The should be pretty optimized. Xcache has limited optimization features.


Lighttpd itself is pretty optimized, the problem is php. Php runs as its own binary and theres not many parameters that can be tweaked.

Is that even correct?


So I got them to enable apache, and disable lighttpd.

This time, it's the other way around.

My ram get's completely used up, forcing the server to use Swap; making the load shoot to 50+. CPU usage is fine the entire way.


This has been going back and forth, enabling/disabling lighttpd and re-enabling apache but a problem always comes up each time.

Am I asking for too much?

Server specs;
Intel C2D E6400
4GB Ram

There is only one IPB board on this server - nothing else.

Average users is 70-200 users within 15 minutes.

This is what I'm getting when lighttpd is on:

top - 22:56:02 up 18:46, 1 user, load average: 23.38, 22.84, 22.44
Tasks: 117 total, 17 running, 100 sleeping, 0 stopped, 0 zombie
Cpu(s): 95.0%us, 4.3%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.2%hi, 0.5%si, 0.0%st
Mem: 4147196k total, 1346888k used, 2800308k free, 203144k buffers
Swap: 2907756k total, 0k used, 2907756k free, 712584k cached

2401 mysql 15 0 318m 107m 3868 S 44 2.6 49:02.02 /usr/libexec/mysqld --defaults-file=/etc/my.cnf --basedir=/usr --datadir=/var/lib
3279 root 15 0 27712 15m 2900 S 12 0.4 10:33.81 /usr/local/lighttpd/bin/php-cgi
3272 root 16 0 29752 16m 2908 R 11 0.4 10:15.94 /usr/local/lighttpd/bin/php-cgi
3266 root 15 0 27536 14m 2920 S 11 0.4 10:40.14 /usr/local/lighttpd/bin/php-cgi
3270 root 16 0 27624 14m 2908 R 11 0.4 10:36.71 /usr/local/lighttpd/bin/php-cgi
3267 root 16 0 27796 14m 2972 R 10 0.4 10:35.22 /usr/local/lighttpd/bin/php-cgi
3268 root 15 0 28148 15m 3112 S 10 0.4 10:49.86 /usr/local/lighttpd/bin/php-cgi
3276 root 16 0 27696 15m 2900 R 10 0.4 10:29.73 /usr/local/lighttpd/bin/php-cgi
3269 root 16 0 28312 15m 2916 R 10 0.4 10:23.57 /usr/local/lighttpd/bin/php-cgi
3274 root 16 0 27924 15m 2912 R 10 0.4 10:44.51 /usr/local/lighttpd/bin/php-cgi
3275 root 16 0 29368 16m 2928 R 9 0.4 10:41.84 /usr/local/lighttpd/bin/php-cgi
3278 root 15 0 29432 16m 2876 S 9 0.4 10:28.52 /usr/local/lighttpd/bin/php-cgi
3271 root 16 0 26784 14m 2900 R 9 0.3 10:41.61 /usr/local/lighttpd/bin/php-cgi
3277 root 16 0 27156 14m 2928 R 9 0.4 10:31.07 /usr/local/lighttpd/bin/php-cgi
3265 root 15 0 28408 15m 2880 S 8 0.4 10:46.89 /usr/local/lighttpd/bin/php-cgi
3280 root 16 0 27036 14m 2880 R 8 0.3 10:43.20 /usr/local/lighttpd/bin/php-cgi
3273 root 15 0 24676 12m 2952 R 8 0.3 10:43.57 /usr/local/lighttpd/bin/php-cgi
3262 root 15 0 13356 11m 632 R 3 0.3 3:04.27 /usr/local/lighttpd/sbin/lighttpd -f /etc/lighttpd.conf
1 root 15 0 2032 648 552 S 0 0.0 0:00.36 init [3]
2 root RT 0 0 0 0 S 0 0.0 0:00.00 [migration/0]
3 root 34 19 0 0 0 R 0 0.0 0:00.00 [ksoftirqd/0]
4 root RT 0 0 0 0 S 0 0.0 0:00.00 [watchdog/0]
5 root RT 0 0 0 0 S 0 0.0 0:00.00 [migration/1]
6 root 34 19 0 0 0 S 0 0.0 0:00.00 [ksoftirqd/1]
7 root RT 0 0 0 0 S 0 0.0 0:00.00 [watchdog/1]
8 root 10 -5 0 0 0 S 0 0.0 0:00.00 [events/0]
9 root 10 -5 0 0 0 S 0 0.0 0:00.00 [events/1]
10 root 10 -5 0 0 0 S 0 0.0 0:00.00 [khelper]
11 root 11 -5 0 0 0 S 0 0.0 0:00.00 [kthread]
15 root 10 -5 0 0 0 S 0 0.0 0:00.00 [kblockd/0]
16 root 10 -5 0 0 0 S 0 0.0 0:00.00 [kblockd/1]

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Jun 22, 2009

I'm having an issue with what I believe is Apache. Things will be running nicely, then all of a sudden things will just 'blow up'. Apache seems to fork a bunch of new processes, and it starts ripping into the memory. I've had it essentially eat through all the free memory and swap, and the system will then freeze up as there's no more memory. This is a CentOS server running CPanel, the configuration had been up and running for a long time without problems then this suddenly started happening.

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Feb 4, 2008

Considering skipping VPS and going to a colo setup for a handful of sites. Nothing major, so the server will be very entry level, but with redundancy in mind (software RAID1 and 2 nics). But I have a few basic questions:

How good is hot swapping in Linux? This was very hard to me to find out online. I am getting a 1U rack with a hot swap backplane and 2 SATA drives. I won't be using any commercial software with my setup.

How does redundant NIC work? This is new to me and am wondering how this is setup.

I think I can shop around NYC for a 1U slot for around $40 a month. I don't need a lot of transfer, but would like a decent pipe. The thought of 1Mbit sounds unattractive (transfer is around 100KBytes/s, right?). How much would 10Mbit cost? I found some quotes but they seem way too much (I could be wrong).

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