CentOS 5 Hardware :: Software RAID1 Arrays Disappearing
Jun 22, 2010
I created two software RAID1 arrays with the following commands:
mdadm --create /dev/md2 --level=1 --raid-devices=2 -v /dev/hda5 /dev/hdc5
mdadm --create /dev/md3 --level=1 --raid-devices=2 -v /dev/hda6 /dev/hdc6
and I verify that /dev/md2 and /dev/md3 exist. But if I reboot the computer, these two devices are gone. I'm sure I am overlooking a step but I can't seem to find what it is. Could someone tell me what I need to do next?
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Nov 17, 2009
I currently have an array with 8TB, that will eventually grow to 10TB+ with 2TB disks. How would I partition, format, then mount an array of this size, and also have room to grow, when I add new disks? I heard ext3 only supports 8tb? So would lvm be the best use here?
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Mar 30, 2010
i want to remove the raid 1 arrays on our server centos and use standalone drive
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Feb 21, 2011
We have CentOS on an HP proliant g5 server and attached to it is an DAS with 3 branches of disks so 5 - 5 - 5 drives.Now what we had so far there is that every branch was on raid 5 and totaling 3 mounted drives each with 4TB (disks are 1Tb each).But a couple days ago something happened while i was replacing older drives with some bad sectors with new one. What I did is to remove old drive, put in new one, initialize and attach to array and rebuild starts.Now somehow 2 drievs ( as i was rebuilding 2 arrays at once) switched place.so disk on 1_1_5 and disk on 1_3_5 switched place. There coul dbe possibility that I made mistake and assigned them to different arrays when initializing but that is really hardly as i replaced one then later another so...
Anyway to the to the point.Is there painless option to remove 1 disk from array and then assign it to other array and then let raid rebuild everything normally?I;ve made backup of everything there so there is no fear of loosing anything...By the way at the same time when that switch happens a partition from 1 raid array completely dis speared and there is only unallocated space on that one right now.
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Jun 10, 2011
With mdadm was only able to add a new drive to the using the --force function. I do not feel comfortable with using the function that way though.
When I remove a disk in VMWare, it perfectly says that the drive is lost and the array is degraded (mdadm --detail /dev/md0). Although after re-adding the drive, it immediately shows device as busy for both mdadm and sfdisk when I don't use --force.
Recovery and repairation of degraded array worked fine with sfdisk --force, mdadm --add --force, it automatically started recovering and took not so long.
What are best practises to manage software raid-1 arrays?
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Jun 26, 2010
I recently bought a D-Link DWA-140 USB wifi adapter for use with my CentOS 2.6.18-194.el5 hoping that it would work seamlessly due to its popularity but having issues with it.
The USB adapter is detected in the System > Administration > Hardware.
It also appears in lsusb:
but when I went into System > Administration > Network it does not appear in the Hardware tab.
After some searching I found out that I need to install some packages which I did.
Namely, rt2870-firmware rpm and kmod-rt2870sta
Then I turned NetworkManager on as a service and through the docked applet on the top menu bar I was able to connect to my wifi net.
However when I rebooted the connection wasn't re-established and when I click on the NetworkManager applet icon it tells me "No network devices available"
Where did my USB adapter and joy go? :(
I can't for the life of me get the adapter to re-surface even if I go to System > Administration > Network and try create a new interface.
No devices appear there in the Devices tab and nothing in the Hardware tab.
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Dec 15, 2009
I have an intermittent issue with with Samba. I can access my samba share with windows xp and vista using windows networking and even by mapping the share to a drive. The problem is that the files and folders disappear inadvertently and I can only access them again if I open the share again from the start with windows explorer. Selinux is disabled and the firewall ports for samba are open. The following software is installed:
samba 3.0.33-3.15.el5_4
samba-client 3.0.33-3.15.el5_4
samba-common 3.0.33-3.15.el5_4
[code]....
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Sep 28, 2009
I am using CentOS 5.2. I am installing from disc on a machine with Intel Embedded Server Raid Technology. It has two 500 GB SATA drives. During the initial boot process, it sees that these two devices exist. However, after getting into the screen to partition and configure RAID, it just shows this:
Drive /dev/mapper/ddf1_MegaSR R! #0 (475879 MB) (Model: Linux device-mapper)
I want to do a RAID1 so that the disks are mirrored. However, I would expect to see both drives listed. I can select RAID to create RAID partitions, but I think I need to be able to see both drives in order to do this correctly.
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Jan 13, 2011
I recently followed this guide to create a RAID1 [URL]First I partitioned the disks with fdiskI made the RAID array with
mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb1 /dev/sdc1
Then I created the filesystem with
mkfs.ext3 /dev/md0
I then mounted md0 at /Video with
mount /dev/md0 /Video/
Today I made a samba-share out of /Video/Rorschach to easily put files in there from my windows7-machine (the plan is to steam from my CentOS-server to my HTPC which hasn't arrived yet).I started to put movies in there. It went just fine for a while but then I got this message:
[URL]
How is that even possible when df -h looks like this?:
[root@Rorschach Rorschach]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
446G 70G 354G 17% /
[code]...
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Jun 11, 2011
I'm new to Centos and very new to RAID/hd setup. I have a old HP proliant G3 ML150. I have no drivers cd or other, only the server. I have created a RAID1 array (named SYSTEM) with 2 HD of 250GB from the controller and have installed Centos 5.2 (updated after to 5.6). The installation is ok. Now I have added 2 HD of 1TB each and have created another RAID1 array (named DATI) from the controller. This RAID is to store data files. (And next I have to add another RAID1 for backup, but this is to do next week). how can I format and add it to Centos so I can use it?
[Code]...
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Oct 22, 2009
I have software RAID 1 on two physical discs. There are now 4 md -partitions (md0 ... md3), which are used in such as / and /home among others. Now current size of /home (md3) is starting to be full, and since / (md1) has more than plenty of free space I decided to fix the situation by shrinking / (md1) partition to free 40 Gigs of space and then growing /home (md3) partition for that 40 Gigs.
I already checked for some info using mdadm and got the following:
Now I would need some support on HOW exactly should I do this resizing since it is on RAID partitions.
Would it be good to use resize2fs to modify the filesystem sizes and mdadm to configure the partition sizes. Or could I perhaps get over this even easier by using GPartED (in case it supports my RAID)? Has anyone here done similar resizing on software RAID1 partitions?
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Jul 2, 2010
The motherboard currently installed on my PC has a RAID Utility (Ctrl+I) at the startup that allow creating RAID1. But I already have a system installed with CentOS 5.4. In order to protect my data, I need RAID1. Can I add another Hard Drive now and have the data mirrored and synced onto both hard drives as if it was in RAID1 right from the beginning?
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Aug 9, 2010
Not sure on what is going on here. The server is RAID1 through hardware RAID. It was running an unusual high load so I rebooted it. Now it won't boot up. I am getting these errors after the CentOS boot screen:sda: Current [descriptor]: sense key: Medium ErrorAdd.Sense: Address mark not found for data field
end_request: I/O error, dev sda, sector 3040555357
device-mapper: raid1: A read failure occurred on a mirror device.
device-mapper: raid1: All sides of mirror have failed.
[code]....
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Aug 28, 2009
OS Version: CentOS 5.3
Motherboard: ASUS M3A78-CM (BIOS v.2003)
I have a single disk running the base OS and just installed 2 x Seagate 500GB SATA 3.0 drives in a RAID1 set that I would like to use for data storage. The OS sees the drives individually but not the RAID. Has anyone worked with a similar board and has any ideas what I need to do to get the OS to recognize the RAID1 array?
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Nov 23, 2010
I'm trying to load CentOS 5.5 on a new server with an Intel S5500BC motherboard using RAID 1. This board has a known problem with RHEL 5.x and the driver disk supplied has a fix. Here is the download for the driver [URL] Under the ESRT2_RHEL4-5_SLES9-1--11_v.13.21.2010_README file are directions in Section 3.1.3 on how to install the RHEL5x megasr driver. This works. The last thing replaces the ACHI driver with the megasr driver (paragraph 15) by loading the megasr.13.21.0614.2010-1-rhel50-u4-all.img in a temp file and then type "./replace_achi.sh". This step doesn't work and it is the critical one as it replaces the achi with megasr in the initrd image.
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May 14, 2011
I installed a distro based on CentOS 5.5 (FreePBX distro FYI). It used an automated kickstart script to create an md RAID1 array of all the hard drives connected to the machine. Well, I installed from a thumb drive, which the script in interpreted as a hard drive and thus included in the array. So, I ended up with three md arrays (boot, swap, data) that included the thumb drive. Even better, it used the thumb drive for grub boot so I couldn't start up without it. I was able to mark the USB drive as 'failed' and remove from each array, and even change grub around to boot without the usb drive, but now each of the arrays is marked as degraded:
[Code]...
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Sep 2, 2009
I've got a mailserver set up in a raid1 array.I shut down the system to install a CD-ROM drive but forgot to change the master/slave settings (I know, don'tt say anything) and didn't realize it before Centos started booting up, so it booted the hdc drive from the array.I rebuilt the array using mdadm without any apparant issues but on subsequent bootup, I get the following error :
kernel: hdc: dma_intr: status=0x51 { DriveReady SeekCompleteError }
kernel: hdc: dma_intr: error=0x84 { DriveStatusError BadCRC }
kernel: ide: failed opcode was: unknown
[code]....
There doesn't seem to be any side effects to this but since that didn't happen prior, I figure there's probably something I didn't do properly since I'm fairly new to the linux world.My raid array was originally set up by the Centos instal software and is set up like this :
hda1 + hdc1 = md0 (boot)
Hda3 + hdc3 = md2 (/)
The other partitions are of the same size on each drive and are swap partitions.
PS : The drive is SMART capable and no errors appear during a self-test.
edit : Clonezilla also fails to boot properly although I don't know if its due to a software raid array in the first place or the errors in the filesystem. When only one drive was detected because of the jumpers, it booted properly.
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Aug 15, 2010
I have installed a 2TB drive in my dual PIII 866 with 750MB ram. The drive is properly installed and I have configured the drive with 1 partition in RAID1. The array loads fine, but when I add the entry to mount the /dev/md2 /data/repository the following error occurs The filesystem size according to the superblock is 488378000 blocks The physical size of the device is 488377986 blocks Either the superblock or partition table is likely corrupt I have run fsck manually with no errors reported. I have removed the partition and rebuilt the array. The array assembles properly and I can manually mount the /dev/md2, but as soon as I add the entry to the fstab I get dropped to a shell after a reboot. Not sure where to go now?
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Dec 29, 2010
I have 2 WD20EARS hard drives on the way (2 TB green WD disks with 4k sectors) and I'll be installing Centos 5.5 in RAID1 on them (2 partitions, one 16 GB / at the beginning and the rest in its own partition). I read the following thread: [URL]
and it seems that I might be having problems with the 4k sectors (Advanced Drive Format in WD lingo). I'm confused as to what exactly to do. I was thinking of downloading Fedora 14 Live CD and partitioning there and then switching to Centos 5.5 to install. Will that work? Seems I want the md 0.9 metadata because it doesn't have the space limit for me (2 TB) and it's stored at the end of the partition so it avoids alignment issues. Will I be able to make that happen with Fedora 14?
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Feb 27, 2011
I've faced the problem with server freeze on heavy write.
System
CentOS 5.5 x64_86 with latest updates and kernel (2.6.18-194.32.1). Also tried 2.6.18-194.26.1 and 2.6.37-2 from ELRepo with the same results.
CPU: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz
Memory: 3 x 2Gb DDR3.
HDDs: 2 x Western Digital WDC WD1002FBYS-02A6B0
[Code].....
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Mar 15, 2009
Yesterday I installed a new server with a large partition for my XEN images. This partition is a about 930GB. The installation tooks ages and after he finished I was finding out why that is. The SoftRAID1 I configured is rebuilding the large partition.
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Feb 1, 2011
We have had a hardisk crash in our RAID1 webhosting server running CentOS5 and Plesk. We first realized something was wrong when our main site didn't load but showed MySQL errors. We then found out that the system was in read-only state. Something that also happened the day before yesterday, but we could fix with a FSCK. Then the system worked well til around 18 hours later when it crashed with the same sympoms. So, we rebooted the server and wanted to do a filesystem check again. But the HDD wouldnt even load. It was gone. Unfortunatelly it was not realized that the second disk in the system was also not working any more for some time now. Fortunatelly we had our main site backed up externally though. So we could re-install a fresh box and mounted the two drives to the system. We checked the harddisk. One is practically empty (the older one), the other has almost only files in 'lost + found' but these are all "numbered", no real filenames or so.
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Nov 12, 2009
I'm trying to create new RAM image file to get my server load raid1 module upon start, I was following redhat documentation & it suggested to use the following command mkinited --with=raid1 inited-raid1-$(uname -r).img $(uname -r) However after running this command I'm getting this message No Kernel available for 'inited-2.6.18-128.el5"
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Dec 15, 2010
So I didn't notice when I setup my CentOS 5.5 server that I left / as RAID 0 on md1. All the rest are RAID 1. Is there a way I can modify the array to RAID 1 without a risk of data loss? I'm glad I caught this before I setup any other services. I've only setup smb so far...
[root@ftpserver ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/md1 16G 3.0G 13G 20% /
[code]....
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Mar 1, 2010
I have a problem on a program,the problem take a very long time when i try to add two big arrays element by elementI know that matlab make adding vectors more faster than adding element by element but I don't know how!!!do any body knew how matlab make vectors operations more faster than element by element???I want to make my calculation more faster because the program is very big
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Nov 3, 2010
I was reading Kernighan Ritchie book chapter 4 which deals with character pointers.I am not able to understand following different type of declarations
Code:
char aname[][15] = { "Illegal month", "Jan", "Feb", "Mar" };
char amessage[] = "now is the time";
[code]...
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Sep 3, 2009
need to process files within multiple directories and transfer these to a remote server. What I had in mind was to use arrays for this; code pasted below (explains it better):
Code:
#set the arrays
array_A=( fileA* pathtodestA hostA passwordA )
[code]...
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Jun 2, 2010
Is there a way to compare an array in a while conditions?
I have one array that contains the results of some search and if the script has found all the items, then it should stop, so my idea is to have a while loop � la:
Code:
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Mar 11, 2011
If I umount both of them, can I run an e2fsck on each at the same time through 2 putty sessions, or will that not really gain me anything from doing them one after another?
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Sep 30, 2010
I am writing a script to get the multiples of 2 and 3, place them in an 2 arrays, and then show the common integers. So far everything works fine till the comparision. I don't know how to compare them. Here is the code:
Code:
#!/bin/bash
let num1="2"
let num2="3"
[code]...
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