Disk Writes Extremely Slow On SATA RAID
Jan 10, 2008
I'm running into a problem with a relatively new (2 months old) server. I have just a few accounts on it, and I'm already noticing unusual loads, for the... load. After some benchmarking with bonnie++ (and plain old "dd") there is clearly a problem.
Version 1.03b ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
SERVER NAME 2G 9096 16 7725 2 2543 0 20609 32 621627 55 +++++ +++
Isn't a write-speed over 7MB/s reasonable to expect? Also look at the low CPU times...
Anyway running the same test on a similar but older AND busier server showed much better results than this. In fact dd'ing a 1GB file from /dev/zero "finished" in about 10 seconds but then pegged the server at 99% iowait (wa) for a full three minutes (until done being written from cache I assume), bringing load to 15.00
That's all the info I have so far... the data center just replaced the card (which gave no errors) with no effect. Running these benchmark tests is about the extend of my hardware experience.
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Sep 18, 2007
I installed CentOS 5.0 and I configured it with software RAID 1, two disks - one IDE 160 GB and one SATA 40 GB.
Here is the setup of the disks:
RAID:
~40 GB RAID 1 md0 ext3
~500 MB RAID 1 md1 swap
Disk1:
~40 gb software raid md0
~500 mb software raid md1
Disk 2:
~40 gb software raid md0
~500 mb software raid md1
After the installation I noticed that the server was very slow so I did a performace test on disk 2, here is the result:
hdparm -tT /dev/hdd first gave me:
Timing buffered disk reads: 6 MB in 3.52 seconds = 1.70 MB/sec
Timing cached reads: 488 MB in 6.92 seconds = 70.57 MB/sec
then gave me:
Timing cached reads: 392 MB in 2.01 seconds = 195.01 MB/sec
Timing buffered disk reads: 2 MB in 3.62 seconds = 566.16 kB/sec
So I assumed something was wrong with the disk and replaced it with an 80 GB IDE disk (same setup as before) and got the following results:
hdparm -tT /dev/hdd:
Timing cached reads: 4 MB in 4.69 seconds = 872.73 kB/sec
Timing buffered disk reads: 6 MB in 3.72 seconds = 1.61 MB/sec
It feels highly unlikely that there is something wrong with both of the IDE disks. So what can be the problem? Can you think of anything?
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Dec 19, 2008
about the hd,there are two options, the first one is four 7200rpm sata to do raid 10,
the second one is two 10000rpm sata to do raid 1, about the performance, which one will be better?
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Mar 7, 2007
Quote:
Today we are going to conduct a detailed study of RAIDability of contemporary 400GB hard drives on a new level. We will take two "professional" drives from Seagate and Western Digital and four ordinary "desktop" drives for our investigation. The detailed performance analysis and some useful hints on building RAID arrays are in our new detailed article.
[url]
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Jul 3, 2008
I'm currently in the process of ordering a new server and would like to throw another $50-$70 at the default SATA II 7k 250 GB to increase performance. The server will host a site similar to WHT (php, mysql, and some forum traffic ).
There are three options I can get for the price:
1. Add another SATA II 7k 250 GB and set up RAID 1
2. Add a 73GB 15k RPM SA-SCSI and put mySQL on it. No RAID.
3. Toss out the SATA II 7k and take two SATA 10k 150 GB instead. Put mySQL on one of them. No RAID.
Please keep in mind that the question is budget-related (I know I can get more if I spend an extra $200 but that's not what I want ). Which of the above will make me happiest?
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Jan 14, 2008
So I've just got a server with 2xSATA raid 1 (OS, cpanel and everything in here) and 4xSCSI raid 10 (clean).
Which one do you guys think will give the best performance:
1. Move mysql only to 4xSCSI raid 10
2. Move mysql and home folder to 4xSCSI raid 10
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Dec 20, 2008
Limestone's support is extremely slow. I just got a server with them to host VPSes, so I was inquiring about additional IPs in case I needed them.
Their first two responses were within 4-5 hours, which is bearable. However, yesterday, I actually needed to order more IPs and posted a new reply. I have yet to receive a reply after over 12 hours and my client has been left waiting to receive the additional IPs he ordered.
I haven't been with Limestone long, and I haven't had much other experience with their support, but I was unsure what else to do other than post this here and hopefully get a resolution.
I know their servers are unmanaged and pretty cheap, but I think they should still take the time to answer tickets in a decent amount of time.
Has anyone had similar experiences with Limestone?
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May 23, 2007
Just curious what your thoughts are on performance:
2 SCSI Drives 10k w/RAID 1
or
4 SATA 10k w/RAID 10
Prices are not too different with 4 drives just being a tad more.
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Jul 28, 2008
I have just gotten a new server and the ping results were pretty fine. However, when it comes to the download speed its horrible. What could be the issue?
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May 4, 2015
In the last few days the responses from Plesk's XML API have been extremely slow. It's now taking an average of 45 seconds to handle an XML API request where it used to be more around 5 seconds. What would cause that? What service handles these requests on the server so I can try rebooting it?
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Apr 28, 2007
on a new pc I tested to install a new disk sata;
ok I installed with using application disk manager 10, but when turned on pc I not see the initial dos screen;
I see directly win xp; (one other pc I have a first step where see for 1 second the dos and where I can, if I want, enter in the bios);
in this new pc I not see this step, so I not know how enter in the bios;
I clicked F10 etc other buttons but not work;
at the moment , after I does some error with acronis for make a dual bootI have this error:
pc not turn on more win xp but have always error mbr;
if I insert a boot floppy I can see the prompt C:
but if I write dir I not see noone files
I have only the dimension of the disk;
if I write format c: not work;
QUESTION:
how I can format all and reinstall
better the sata disk?
and after, the steps for install on a 2nd partition one linux S.O.
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May 22, 2008
I want to take some data from a raid-disk (taken from a raid-1 sstem). Put it into a new system already, but this system doesn't have any raid.
When viewing "fdisk -l", it said /dev/sdb doesn't contain valid partition. Is there anyway I can mount it now? I am on CentOS 4 box
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May 20, 2009
I have a new server and it is rather slow during raid 1 recovery after system installed
CPU: Intel Core2Duo E5200 Dual Core, 2.5Ghz, 2MB Cache, 800Mhz FSB
Memory: 4GB DDR RAM
Hard Disk 1: 500GB SATA-2 16MB Cache
Hard Disk 2: 500GB SATA-2 16MB Cache
root@server [~]# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb1[1] sda1[0]
256896 blocks [2/2] [UU]
md1 : active raid1 sdb2[1] sda2[0]
2096384 blocks [2/2] [UU]
md2 : active raid1 sdb4[2] sda4[0]
480608448 blocks [2/1] [U_]
[=======>.............] recovery = 36.7% (176477376/480608448) finish=1437.6min speed=3445K/sec
the sync speed is just 3.4Mb/second and the total hours needs to be more than 40 hours
Also the server load is very high (nobody uses it)
root@server [~]# top
top - 07:00:14 up 16:55, 1 user, load average: 1.88, 1.41, 1.34
Tasks: 120 total, 1 running, 119 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.2%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.2%si, 0.0%st
Mem: 4148632k total, 747768k used, 3400864k free, 17508k buffers
Swap: 5421928k total, 0k used, 5421928k free, 569252k cached
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Oct 23, 2008
I have a delicated server with "Intel RAID Controller: Intel(R) 82801ER SATA RAID Controller",I cannot find information on this raid.The 80 GB harddisk is about 4 years old,if one harddisk fail,I wonder if I can swap a new one bigger capacity and it will auto rebuilt?
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Apr 5, 2009
For a Vbulletin forum with up to 200 users online (only) but growing nicely and I want to be set for quite a while:
I am going to use Nginx, XCache, PHP-FPM, FreeBSD, Gzip
Currently using ~55 GB transfer with mod_deflate, all with dynamic traffic, little bits and pieces, no bigger files.
I want to be able to push 500 GB transfer or so this way, or ~ 1000 users online, many searches from non-registered users, too
I am looking at
Q9550, 8GB, 4x73 SAS 10k Raid-10, $200 Webnx
or
i7 920, 12GB, 4x73 SAS 15k Raid-10, $250 Webnx
or
X3220, 8GB, X25-E SSD Intel, $300 Softlayer
Am I too concerned about disk I/O? Should I save some money and settle for a 2xSATA Raid-1.
Databases are < 2GB and would fit into the RAM
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Sep 12, 2009
trying to get my Win2k3 Standard R2 server to work.
Problem:
I did some Windows update around 3am this morning but during the update process. I lost Remote desktop connection as my machine is do several attempts to connect with the remote server. I cancel the attempt after several try. I figure i can remote desktop back in again if i wait for a bit but I couldn't re-establish the connection with my remote server. So, I drove to the Datacenter to check it out and it turn out the machine have rebooted and I'm stuck with "NTDetect failed" error message. After some googling, I was trying to fix this error by copying NTLDR and NTDetect.COM into C: but when i tried to use the Win2k3 CD to go into Windows Setup and repair. I got an error message telling me that "Setup did not find any hard disk drives installed in your computer...".
After some googling, I found the two Maxtor SATA hard disks might be the problem and one soultion that i found was to disable the SATA or set it to IDE since the motherboard have nvida RAID controller onboard. I check the BIOS and the RAID is set to disabled and then i tried to disable SATA and only enable IDE. It still give me the same error message about not able to find any hard disk.
I'm on my last rope here. I'm short of reformatting the hard disk and do a fresh reinstall but I will like to avoid this.
Does anyone know if cancel Remote desktop connection attempt during Windows update process cause this NTdetect failed problem or something else that might related to my hardware. I can assure you that two SATA hard disks shown on BIOS.
The soultion to NTDecte failed problem seem to be just copying NTLDR and NTdectect.com into C: but since i can't even get to Repair mode during Windows setup with no disk install error. Can someone recommand how to solve this problem?
The motherboard that i use is ASUS M2N-MX SE AM2 NVIDIA GeForce6100 / nForce430 and the BIOS is American Megatrends Inc.
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Dec 11, 2007
Planning to buy a server from softlayer, adding a single 300gb 15k scsi drive costs 100$/month and adding 4 250gb sata drives with raid-10 costs 90$/month
Which one would you pick up and why?
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Nov 13, 2007
I've recently put together a server in a hurry and overlooked an important aspect - data integrity after power loss. I'm using Linux software RAID-1 with two 150GB WD Raptors but I'm worried that data could be lost due to having write-back cache enabled without a battery backup unit. I would rather not disable the write-back cache for performance reasons.
What is the cheapest way to get a battery backup solution for Linux software RAID? Do I have to use a hardware RAID card or do standalone battery backup units exist that can use existing motherboard SATA ports?
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Dec 20, 2007
I've been having trouble with my VPS for a while now. In the QoS alerts page in Virtuozzo it seems to be a problem with numtcpsock and tcprcvbuf, mainly numtcpsock.
Copy these into the browser:
i18.photobucket.com/albums/b106/gnatfish/qosnumtcpsock2.jpg
And when i run cat /proc/user_beancounters:
i18.photobucket.com/albums/b106/gnatfish/beancounters2.jpg
This line is particularly scary:
numtcpsock 164 164 166 166 7321
What do i need to do, to get the website running again? It's only one site on the vps a proxy. So i thought a vps would be able to handle one proxy.
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Apr 30, 2007
Recently, my access to my server is very slow. I am on a VPS with 2 Quad E5320 processors and with Softlayer datacenter. I have been monitoring ping latency and it is acceptable at 50ms monitored every 10 minutes for several weeks.
Below is a record of the server memory I got from CPanel WHM. Can you help interpret what these numbers mean and how this affects the performance of the server?
Code:
Current Memory Usage
total used free shared buffers cached
Mem: 12453608 12361356 92252 0 25724 3161160
-/+ buffers/cache: 9174472 3279136
Swap: 16779884 1238076 15541808
Total: 29233492 13599432 15634060
I would like to send a feedback to the webhost provider and this will help me back it up with data.
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Jan 11, 2007
I took two harddrives out of a windows 2003 server and imported them as foreign disks in my pc
the problem is... when i imported them as foreign disks, windows xp decided to mark every partition on both disks as failed... even though it hasn't failed.
Problem is now, i cant map to a drive... i need to do this so i can do an NT backup from the data off the drive, then restore that data to a new drive.
Here is what disk management looks like:
http://www.digitallyhosted.com/disk_management.gif
However when i look at it in Active Partition Recovery.... without running any recovery tools... it sees the data on all the drives fine:
http://www.digitallyhosted.com/partition_recovery.gif
Is there anyway to get windows to stop being a complete pain about this and just map the drive.
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Jan 29, 2007
I have configured a Xen setup on a dual xeon system with a 3ware 8506 2 ports sata controller.
Array is configured in raid1 and I am using LVM.
I get really slow accesses on the virtual machines, when I create a big ext3 system, the system is nearly freezing.
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Oct 27, 2009
If you want a quick run down as to WHY I want to do this, read here
Basically, my ISP could not get my server running stable on a simple raid 1 (or raid 5) so what it came down to was having them install my system on a single disk. I don't exactly like this, main reason being, if the system (or HDD) crashes, I'll end up with another several hours of down time... So here is my proposal:
Please Note: This will have to be accomplished on a live System (full backups!) over ssh as I don't trust my ISP to do things right as described in my post above.
Current Setup:
CentOS 5.3 x86_64
Dual Xeon 5410
16GB RAM
4x 750GB HDDs
/boot - /dev/sda1 - 512MB (real 471MB) ext3
/ - /dev/sda2 - 50GB (real 46GB) ext3
/home - /dev/sda3 - remaining space (real 642GB) ext3
swap - /dev/sdb1 - 32GB
/backup - /dev/sdb2 - remaining space (real 659GB) ext3
/dev/md0 - /dev/sdc + /dev/sdd - raid 1 (NOTE: uses entire disk, no partitions!)
Proposed Solution:
Code:
vgcreate -s 64M vg0 /dev/md0
lvcreate -L 512M -n lvboot vg0
lvcreate -L 50G -n lvroot vg0
lvcreate -L 5G -n lvtmp vg0
lvcreate --extent 100%FREE -n lvhome vg0
mkfs -t ext3 -m 1 /dev/vg0/lvboot
mkfs -t ext3 -m 1 /dev/vg0/lvroot
mkfs -t ext3 -m 1 /dev/vg0/lvtmp
mkfs -t ext3 -m 1 /dev/vg0/lvhome
Now, I'd like to 'init 1' at this stage but I can't, so I won't (possible solutions?? Possible to umount the / partition??)
Assuming I'd have to do this on a fully live system, I'd disable all services that I can
Code:
/etc/init.d/sendmail stop
/etc/init.d/postfix stop
/etc/init.d/saslauthd stop
/etc/init.d/httpd stop
/etc/init.d/mysql stop
/etc/init.d/courier-authlib stop
/etc/init.d/courier-imap stop
/etc/init.d/amavisd stop
/etc/init.d/clamd stop
/etc/init.d/pure-ftpd stop
/etc/init.d/fail2ban stop
/etc/init.d/syslogd stop
Then we copy all of our data from the single partitions to the raid disks
Code:
mkdir /mnt/newroot
mkdir /mnt/newroot/boot
mkdir /mnt/newroot/tmp
mkdir /mnt/newroot/home
Code:
mount /dev/vg0/lvboot /mnt/newroot/boot
mount /dev/vg0/lvroot /mnt/newroot/root
mount /dev/vg0/lvtmp /mnt/newroot/tmp
mount /dev/vg0/lvhome /mnt/newroot/home
(I think I covered everything)
Code:
umount -l /dev/sda1 (/boot)
umount -l /dev/sda3 (/home)
cp -dpRx /* /mnt/newroot/
mount /dev/sda1 /boot
cp -dpRx /boot/* /mnt/newroot/boot/
mount /dev/sda3 /home
cp -dpRx /home/* /mnt/newroot/home/
Once we have everything copied, update /etc/fstab and /etc/mtab to reflect the changes we made:
vi /etc/fstab
Code:
LABEL=/home /home ext3 defaults 0 3
LABEL=/ / ext3 defaults,usrquota,grpquota 1 1
LABEL=/boot /boot ext3 defaults 1 2
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
LABEL=SWAP-sdb1 swap swap defaults 0 0
To
Code:
/dev/vg0/lvhome /home ext3 defaults 0 3
/dev/vg0/lvroot / ext3 defaults,usrquota,grpquota 1 1
/dev/vg0/lvboot /boot ext3 defaults 1 2
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
LABEL=SWAP-sdb1 swap swap defaults 0 0
Moving on, we make a fail safe in the event this doesn't work out:
vi /boot/grub/menu.lst
find
Code:
default=0
add after
Code:
fallback=1
Then we find (in the same file):
Code:
title CentOS (2.6.18-164.el5)
root (hd1,0)
kernel /vmlinuz-2.6.18-164.el5 ro root=/dev/vg0/vgroot
initrd /initrd-2.6.18-164.el5.img
Add before:
Code:
title CentOS (2.6.18-164.el5)
root (hd3,0)
kernel /vmlinuz-2.6.18-164.el5 ro root=/dev/sda2
initrd /initrd-2.6.18-164.el5.img
Where (hd3,0) is /dev/sdc. If the system fails to boot to the raid then it'll auto boot to the single disk (/dev/sda)
then update my ramdisk:
mv /boot/initrd-`uname -r`.img /boot/initrd-`uname -r`.img_bak
mkinitrd /boot/initrd-`uname -r`.img `uname -r`
And now to set up grub...
Code:
grub
> root (hd0,0)
> setup (hd0)
we should see something like this:
Checking if "/boot/grub/stage1" exists... no
Checking if "/grub/stage1" exists... yes
Checking if "/grub/stage2" exists... yes
Checking if "/grub/e2fs_stage1_5" exists... yes
Running "embed /grub/e2fs_stage1_5 (hd0)"... 15 sectors are embedded.
succeeded
Running "install /grub/stage1 (hd0) (hd0)1+15 p (hd0,0)/grub/stage2 /grub/grub.conf"... succeeded
Done.
Code:
> root (hd3,0)
> setup (hd3)
Again, we should see something like this:
Checking if "/boot/grub/stage1" exists... no
Checking if "/grub/stage1" exists... yes
Checking if "/grub/stage2" exists... yes
Checking if "/grub/e2fs_stage1_5" exists... yes
Running "embed /grub/e2fs_stage1_5 (hd1)"... 15 sectors are embedded.
succeeded
Running "install /grub/stage1 (hd1) (hd1)1+15 p (hd1,0)/grub/stage2 /grub/grub.conf"... succeeded
Done.
Code:
> quit
From here I think we're ready to reboot, can't see where I missed anything. If all goes well then I should see my volume groups listed in 'df- h'
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Mar 6, 2007
I tried setting up my web server with the user's home directories as a NFS and everything seemed to be working except for one thing I found. When I used php write which I have a couple scripts that do, it can't use fopen with the option "w" which means to trunicate the length to 0 and point at the beginning of the file.
It allows me to use "a" which just writes at the bottom of the file. This is weird because when I login to shell I can delete the files, edit the files, and make files.
It gives me this error....[function.fopen]: failed to open stream: Operation not permitted
httpd 2.0.59, php 4.4.6, userspace nfs, using no_root_squash,sync,no_all_squash,rw in the exports.
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Mar 16, 2008
I have a disk in raid, but it seems raid is not working correctly. I took it out, and plug into another server without raid. However, fdisk shows error
Quote:
#fdisk /dev/sdb
device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
The number of cylinders for this disk is set to 20023.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
Command (m for help):
Should I correct the partition table now, or should I put it in another raid for checking?
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May 15, 2007
I have a windows 2003 VPS and I'm not satisfied with the HD I/O speed, and before I mention what speeds I am getting I just want to see what people say should be plausible. I want to know if I am thinking I should get more out of the VPS then I really should.
Anyway, I used this program from ATTO to benchmark:
short-media.com/download.php?d=108
Called ATTO Disk Benchmark
If anyone is willing, run it on your VPS and post a screenshot. It's a standalone .exe, no install needed.
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Jul 19, 2007
During my poking around performance tips I found the DELAY_KEY_WRITE option (and innodb_flush_log_at_trx_commit = 0 for innodb)
which supposedly for mysql will disable the immediate disk flush for every transaction written and instead update only once every second at most?
One thing I've never had to restart on my vps is mysql, it's been great. So is this safe to turn on? Am I risking corruption? Will the performance gain be worth it with only a 16M cache?
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Apr 22, 2008
Just a warning to everyone.
I ordered 5 servers from alphared.com, I spent an entire evening explaining to their sales person what I required.
In the end I decided on 4 Duo's and one P4. All to be connected with a Gigabit private Lan and to share 10Mbit premium bandwidth. I was promised it would take approx three days for this to be setup.
One week later I was met with an apology that the price quoted would unfortunately have to be tripled due to a mistake.
I paid $3,500 setup. Its now three weeks later and I have NO service.
I follow up every few days and am promised the service will be up soon.
STILL NO SERVICE!
Today I'm met with ANOTHER email saying it will be 10 days to allocate me 32 IP's. Not to mention the mess that every few days I'm asking how I want the servers setup.
I have missed my deadlines, my current provider is still billing me, my clients are moaning that I"m doing nothing about our current providers issues.
Are there any decent providers out there? or is finding someone who is competent and does what they say a pipedream?
And I guess I've lost $3,500 ... haven't I?
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Jul 29, 2008
We've a quadcore Xeon and start to have issues with its very high cpu load (which is made by apache & mysqld,).
So here is ps aux:
Code:
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.0 2040 620 ? Ss Jul13 0:13 init [3]
root 2 0.0 0.0 0 0 ? S Jul13 0:00 [migration/0]
root 3 0.0 0.0 0 0 ? SN Jul13 0:00 [ksoftirqd/0]
root 4 0.0 0.0 0 0 ? S Jul13 0:00 [watchdog/0]
root 5 0.0 0.0 0 0 ? S Jul13 0:00 [migration/1]
root 6 0.0 0.0 0 0 ? SN Jul13 0:00 [ksoftirqd/1]
root 7 0.0 0.0 0 0 ? S Jul13 0:00 [watchdog/1]
root 8 0.0 0.0 0 0 ? S Jul13 0:00 [migration/2]
root 9 0.0 0.0 0 0 ? SN Jul13 0:00 [ksoftirqd/2]
root 10 0.0 0.0 0 0 ? S Jul13 0:00 [watchdog/2]
root 11 0.0 0.0 0 0 ? S Jul13 0:00 [migration/3]
root 12 0.0 0.0 0 0 ? SN Jul13 0:00 [ksoftirqd/3]
root 13 0.0 0.0 0 0 ? S Jul13 0:00 [watchdog/3]
root 14 0.0 0.0 0 0 ? S< Jul13 0:00 [events/0]
root 15 0.0 0.0 0 0 ? S< Jul13 0:00 [events/1]
root 16 0.0 0.0 0 0 ? S< Jul13 0:00 [events/2]
root 17 0.0 0.0 0 0 ? S< Jul13 0:00 [events/3]
root 18 0.0 0.0 0 0 ? S< Jul13 0:00 [khelper]
root 19 0.0 0.0 0 0 ? S< Jul13 0:00 [kthread]
root 25 0.0 0.0 0 0 ? S< Jul13 0:01 [kblockd/0]
root 26 0.0 0.0 0 0 ? S< Jul13 0:01 [kblockd/1]
root 27 0.0 0.0 0 0 ? S< Jul13 0:01 [kblockd/2]
root 28 0.0 0.0 0 0 ? S< Jul13 0:03 [kblockd/3]
root 29 0.0 0.0 0 0 ? S< Jul13 0:00 [kacpid]
root 122 0.0 0.0 0 0 ? S< Jul13 0:00 [cqueue/0]
root 123 0.0 0.0 0 0 ? S< Jul13 0:00 [cqueue/1]
root 124 0.0 0.0 0 0 ? S< Jul13 0:00 [cqueue/2]
root 125 0.0 0.0 0 0 ? S< Jul13 0:00 [cqueue/3]
root 128 0.0 0.0 0 0 ? S< Jul13 0:00 [khubd]
root 130 0.0 0.0 0 0 ? S< Jul13 0:00 [kseriod]
root 205 0.0 0.0 0 0 ? S Jul13 0:46 [pdflush]
root 207 0.0 0.0 0 0 ? S< Jul13 0:43 [kswapd0]
root 208 0.0 0.0 0 0 ? S< Jul13 0:00 [aio/0]
root 209 0.0 0.0 0 0 ? S< Jul13 0:00 [aio/1]
root 210 0.0 0.0 0 0 ? S< Jul13 0:00 [aio/2]
root 211 0.0 0.0 0 0 ? S< Jul13 0:00 [aio/3]
root 383 0.0 0.0 0 0 ? S< Jul13 0:00 [kpsmoused]
root 433 0.0 0.0 0 0 ? S< Jul13 0:00 [ata/0]
root 434 0.0 0.0 0 0 ? S< Jul13 0:00 [ata/1]
root 435 0.0 0.0 0 0 ? S< Jul13 0:00 [ata/2]
root 436 0.0 0.0 0 0 ? S< Jul13 0:00 [ata/3]
root 437 0.0 0.0 0 0 ? S< Jul13 0:00 [ata_aux]
root 443 0.0 0.0 0 0 ? S< Jul13 0:00 [scsi_eh_0]
root 444 0.0 0.0 0 0 ? S< Jul13 0:00 [scsi_eh_1]...
They don't appear for some time if I kill them (a day or more). But it repeats again and again. One day there were 8 similar processes in total in max which used all 4 cores at 100% (and even ssh console was extremely slow to do something there).
I think that somebody is trying to make a small attack of some sort but I need to check it first. I tried to look at apache logs but there were too many posting requests from different IPs and no dublicates for little period of time so I had no success.
Anyway, that script worked for us for 4 years already and we didn't have any problems with it even on our old single core P4 2.8 ghz.
way to make sure is this an attack of some sort or just this script doesn't work correctly on our new machine?
Are there any ways to get IPs of visitors who are running posting.php with CPU overloading?
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