Verify RAID Status
Oct 26, 2009I have a Debian server with RAID 1 via hardware.
Could someone tell me how can i check the RAID status? ( if a hd failed or something like this ).
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Anyway To Verify RAID 1 Is Working
Apr 3, 2008I had a server admin install a new drive in RAID 1 (mirrored drives). I'm not the best linux guy in the world... but is there a way either through linux, WHM/cPanel, etc. to check and verify that the drives are mirroring correctly? I just want to sleep soundly everynight knowing if a drive failed I'd have another drive up and going.
View 3 Replies View RelatedRAID Health Status
Oct 15, 2009I have a PROMISE TECH hardware raid card running a 4 disk RAID 10 array. I logged into today to check the drive statuses which were:
Drive 1: OK
Drive 2: OK
Drive 3: OK
Drive 4: OK, PFA
So they all look to be okay, but that 4th disk has PFA (I'm guessing that stands for predicted failure analysis) but I am not sure if that means its predicting a fail, or just stating that the technology is running?
Also, this array is the system drive on a server which has much too little memory, (there is usually 5-7GB PF swap during the day) and I'm concerned that the drives constantly under that stress are more prone to fail. They are 2.5" SAS 10k Fujitsu if that means anything.
400GB Hard Disk Drives In RAID 0, RAID 5 And RAID 10 Arrays: Performance Analysis
Mar 7, 2007Quote:
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]
Httpd-status Vhost Status
Feb 25, 2007In httpd-status under vhosts column i sometime see "(unavailable)" instead of actual vhost.
Can you please tell me if it means that the connection has timed out or something else?
Hardware RAID: Is Motherboard RAID As Good As A Dedicated PCI-E Card
Mar 24, 2008Is Motherboard RAID as good as a dedicated PCI-E card? I am guessing a dedicated card is the best option, though costs more.
We are looking at buying a barebones server from Supermicro. It features an onboard RAID controller which supports RAID 0, 1, 5 & 10 - but for some strange reason it will only support RAID 5 if you use Windows. Here is a link to the page detailing the RAID features.
[url]
We are going to be running Linux, CentOS 5.1, so we will only have the choice of RAID 0, 1 or 10. This isn't an issue, as having RAID 10 on 4x SAS (15k) drives will be fine for speed and stability. What is an issue is would this RAID controller be as fast or reliable compared to a dedicated PCI-E card? If it can only use RAID 5 in windows, does that suggest this controller is too reliant on software? It would be a nightmare to suffer downtime and data loss because the controller couldn't hack it during a drive failure, or one day it decided to bugger up the array when rebooting.
So that leads me to looking at this card, this looks very good for what we need. Are adaptec a reliable brand? I've seen it advertised for £200, which is a good price.
[url]
This card features RAID 5 and 6, would RAID 6 be better than RAID 10 for redundancy, or is it too slow to bother with? Also it seems to have a battery module available for it, what does this achieve? Cos surely if the power dies the hard drives and motherboard can't run off this little battery, or does it just help the controller stay alive long enough with some hard drive information in its memory if the power goes out during a rebuild?
Any Experiences With Software-Raid 5 Vs Hardware-Raid 5? (e.g. Hetzner EQ9)
Sep 17, 2009I could try the Software-RAID 5 of the EQ9 Server of Hetzner.
Does anyone here has experiences, how fast a hardware raid 5 compared against the software-Raid 5 is?
The i7-975 should have enough power to compute the redundnacy on the fly, so there would be a minimal impact on performance. But I have no idea.
I want to run the server under ubuntu 8.04 LTS x64.
On it a vitualisation like VMware the IO-Load could get really high.
Whats The Best For Server With SATA Raid 1 And SCSI Raid 10
Jan 14, 2008So 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
How To Setup Software RAID-10 On Linux With /boot On RAID-1
Jul 8, 2007I am in a somewhat complicated situation... I wanted to order a custom server with hardware 3Ware RAID controller but after over a month of waiting I was told the HW RAID controller, as well as any other 3Ware controller they tried, does not work with the motherboard used in the server from Fujitsu-Siemens and that they simply got a reply from FS that the controller is not certified to work with their motherboard.
So although I'd prefer a HW raid, I am forced to either choose a different webhost or setup a software RAID. The problem is, I haven't done that before and am somewhat moderately...scared
I have read a lot of the info about SW RAID on Linux that I could find through Google but there are some questions unanswered still. So I thought that perhaps some of the more knowledgeable WHT members could help me with this problem...
The server specs will be:
Core2Duo E6600 (2.4Ghz), 2GB RAM, 6-8x* 250GB SATA II HDDs, CentOS 4.4 or SuSe, DirectAdmin
* I prefer 8 HDDs (or actually 9) over 6 but I am not sure if their server chassis can hold that many HDDs, I am awaiting answer from them. They don't have any other drives beside the 250GB ones so I am limited to those.
The preferred SW RAID setup is to have everything in RAID 10, except for the /boot partition which has to be on RAID-1 or no RAID I believe, plus one drive as hot spare (that would be the 9th drive). I am quite sure they will not do the setup for me but will give me access to KVM over IP and a Linux image preinstalled on the first HDD so that I'll have a functional system that needs to be upgraded to RAID-10.
How do I do that? The big problem I see is that LILO or GRUB can't boot from a software RAID-5/10 so I will have to mount the /boot partition elsewhere. It's probably terribly simple...if you have done it before which I have not. I have read some articles on how to setup a RAID-5/10 with mdadm (e.g. [url] ) but they usually do not talk about how to setup the boot partition. Should it be setup as a small sized (100-200MB) RAID-1 partition spread over all of the drives in the otherwise RAID-10 array?
What about swap? Should I create a 4-8GB (I plan to upgrade the server RAM to 4GB in near future) RAID-1 swap partition on each of the disks or swap to a file on the main RAID-10 partitions. The second sounds simpler but what about performance? Is swapping to a file on RAID-10 array a bad idea, performance wise?
Is it possible to grow a RAID-10 array in a way similar to growing a RAID-5 array with mdadm (using two extra drives instead of one of course)? mdadm doesn't actually even mention RAID-10 despite it does support it without having to create RAID-0 on top of RAID-1 pairs if the support is in kernel, from what I know.
Worth Having RAID 1 If Raid Arrays Break
Feb 25, 2009How often do RAID arrays break? Is it worth having RAID if a servers hard drive goes down? I was thinking it may just be a better option to just have a backup drive mounted to my system and in the even of a system failure just pop in a new hard drive, reload the OS, and then reload all my backups?
View 14 Replies View RelatedSoftware Raid 1 - Rather Slow During Raid 1 Recovery
May 20, 2009I 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
RAID 5 Vs RAID 10 In Shared Hosting Server
Oct 22, 2009I am in the process of restructuring the infrastructure on our servers. I am thinking of using either RAID 5 (1 hot spare) vs RAID 10 as my 1U server has 4 HDD tray.
RAID 5 would have better capacity but RAID 10 has better overall performance. Which one do you guys go for a shared hosting server?
Turn Non Raid Into Raid On Live Server
Dec 23, 2008Is it possible to turn a non raided setup into Linux software raid, while it is live, and if it's the OS drive? Can you even software raid the OS drive remotely? I've been thinking about doing it for the redundancy (and possible slight performance boost for reads, but doing it more for redundancy). I'm using CentOS.
View 12 Replies View RelatedRead Raid-disk On Non-raid System
May 22, 2008I 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
3ware RAID Or Software RAID
Mar 24, 2009MY server configure our drives with RAID-1.
How can I check it my server configure with 3ware or software raid ?
Also please advise me how can I monitor raid configuration that my raid is working fine or no ?
RAID Or Not To RAID: Trying To Decide On A New Server
Jul 11, 2008I've been talking to the Planet about trading in my four and a half year old "SuperCeleron" (from the old ServerMatrix days) Celeron 2.4 GHz system for something new. As part of their current promotions, I've configured a system that looks decent:
Xeon 3040, 1 gig of RAM, 2x250GB hard disks, RHEL 5, cPanel+Fantastico, and 10 ips for $162.
Not too bad. I could bump up the ram to 2 gb for, I think, $12 more, which I'm thinking about and wouldn't mind some thoughts on. But, the thing that has me really confused is RAID. I like the idea of doing a RAID 1 setup with those two hard disks. But, the Planet wants $40/month for a RAID controller to do it. I really don't want to go over $200 a month!
Any thoughts on alternative redundancy strategies that might avoid that cost? Software RAID does not seem to be offered by the Planet, unless I can figure out how to do it after installation (is that possible?) Better ideas in general on the server?
Raid 1 SCSI Or Raid 10 SATA 10k
May 23, 2007Just 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.
Software Raid Vs. Hardware Raid
Jun 5, 2007how well software raid can perform and how it compares to hardware raid. How does software raid actually work and is it worth it?
How should I look at be setting up software raid if I was going to? Would you recommend just to use hardware raid instead?
RAID 10 Or RAID 5 With Online Backup
Dec 10, 2007Which do you guys recommend of the following?
4x 73GB 15,000rpm SAS drives in a RAID 10
or
4x 73GB 15,000rpm SAS drives in a RAID 5 w/ online backup
How To Verify Guarenteed Ram
Aug 27, 2007I have a virtuozoo VPS and I want to know whether I actually have the 384 MB RAM I have been promised. how do I verify my guarenteed ram figure?
View 7 Replies View RelatedCan't Verify My Site On Google
Jan 30, 2009please bear w/ me since this is my first time on launching a site online..
My site is being hosted by a free hosting company..
When I tried viewing the source code of my page some of the html tags are not seen like the <html>,<meta>,<head>...
and I can't seem to verify my site on google...
Verification status: NOT VERIFIED
Last attempt Jan 30, 2009: We've detected that your 404 (file not found) error page returns a status of 200 (Success) in the header.
why is this so?
Did the host delete those?
what should i do?
Exim Sender Verify
Oct 30, 2009We had a non-client (not on our server) that was getting 550 email rejections when he attempted to email us due to having Sender Verify enabled.
In the past I figured Sender Verify was necessary for fighting spam, amongst other things, but have realized that we may be having more rejections than we know because we never hear about them.
Is there a general best practice in terms of enabling Sender Verify or leaving it off? I've never heard about complaints about rejects from legitimate emails senders, so it doesn't seem to be an issue, but then again, you really never know...
Verify If Domain Is On Nameservers
Apr 6, 2008I have a domain: myname.com
whose nameservers have been already update to the new host's nameservers: ns1.myhost.com and ns2.myhost.com
The new NS for the domain was already propagated over 1 day ago.
However, it seems that myname.com is not yet resolving at myhost.
How can I check whether myname.com is on ns1.myhost.com nameservers?
I have yet no shell access, and it is shared hosting.
HELO Verify In Exim
Jan 6, 2007!verify = helo
!verify = reverse_host_lookup
in exim acl and drop message if helo is not passed.
But one issue is this validates for users even having account in the server and trying to send mail using server account to someone else
I want to put validation for only incoming mails "to" this server
What i dont want is to validate the mails that authenticated smtp users send
Sender Verify Callout
Jan 17, 2007I´m seeing that a lot of servers are rejecting my emails showing this error:
451 - could not verify sender (callout)
Reverse DNS is working fine, and I couldnt see any kind of error on dnsstuff.com.
I´m using EXIM/CPANEL. I tried to send from one cpanel server to another cpanel server and I´m still getting error.
Warning: Verify 404 Error Pages
Feb 22, 2009This is just to recommend verifying your 404 error pages. We have found they have been replaced by junk advertising.
View 14 Replies View RelatedHow Can I Verify My Dedicated Server Architecture
Jan 14, 2009if there was a way of remotely verifying my dedicated server architecture.
The hosting is done through our design company who then use a 3rd party for hosting a number of sites, and as such I don't have direct access to server control panels etc.
Short of just taking their word for the fact that we have the servers we're supposed to, I was wondering if there's any way I can be sure. We're supposed to have dual web servers plus a database server.
Check And Verify DDOS Attack?
Jan 4, 2008in the last couple of days we really have problem accessing web service, while ftp, ssh, work fine. While we getting connection time out, the load on the server is really load around .2 and get numerous e-mail from Cpanel that httpd is failling and try to restart.
How can i do to check and verify that there a DDOS attack?
What step can i do to possibly minimize DDOS attack?
How To Verify 100 MBPS Uplink Speed
Aug 14, 2007I recently purchased a new Dedi server, and got 100 MBPS Uplink. Now, I'm uploading 16GB size of files into this server, and I have a suspicious feeling that this upload speed is not what they told me. For the very 1st day, I opened a ticket and they said that they upgraded it to 100 mbps. I saw this speed was faster immediately. On 2nd day, it went down to around same slow speed before. Since then, I kept opening a new ticket and they said it was done, or sometimes I am under DDos attack..? What? I don't even have the site up yet! How come there is DDos attack?
Anyway, today I was told that I'm getting billed for this 100 mbps uplink, because it's a new service. What a crazy thing going on here... I am so tired of this ticket game and just don't understand why they don't commit what they told me initially.
Can anyone please tell me how I can verify and prove that I am having this 100 MBPS Uplink speed? The only thing I can tell with my eyes is that I can see those FTP upload progress bar. When it's very fast to upload one file, I assume that I have right speed.
But is there any tool or command that I can execute on the server shell, and tell them what I get as a proof?
Apache :: What Do Values From SSL CLIENT VERIFY Mean
Dec 18, 2012If you enable ssl in apache, you can verify a client certificate. If so apache will create a environment variable for you with the name 'SSL_CLIENT_VERIFY' with values 'NONE, SUCCESS, GENEROUS or FAILED:reason'. URL....What is the meaning of this different values?
View 1 Replies View RelatedApache :: Can't Verify Server Identity
Jun 17, 2015We are facing an issue i.e "Can't verify server identity",When we hit the platform 'teampark.sogeti.com' from android mobile application.Whenever we hit teampark.sogeti.com from Mobile Application ( IBM connections android App), our initial request will hit our Reverse Proxy and Validates the user certificate and forward it to the next level.We are using Apache 2.2.9 as our Reverse Proxy.
View 10 Replies View Related