Buffer I/o Error On Device Dm-4 Logical Block
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Buffer I/o Error On Device Dm-0 Logical Block
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Buffer I/o Error On Device Dm-0
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Buffer I/o Error On Device Dm-1
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on megaraid rebuild, analysis and Issues related to hardware problems Post Reply Print view Search Advanced search 13 posts 1 2 Next jamesNJ Posts: 18 Joined: 2015/02/25 21:49:44 CentOS server freeze/crash on megaraid rebuild, analysis and buffer io error on device dm 0 logical block Quote Postby jamesNJ » 2015/07/24 17:25:21 Hello all,I have a problem with a large
Buffer I O Error On Device Sdb Logical Block
CentOS 7 server hosting an LSI MegaRAID controller with 16x 1tb SAS drives. The server goes dead at night requiring a forced buffer i o error on device sr0 logical block reboot or power cycle to restore service. If it matters, this server has 1 large RAID-6 volume with 1 global hot spare available.I believe I have narrowed this issue down to the MegaRAID controller being busy http://www.linuxquestions.org/questions/linux-software-2/buffer-i-o-error-on-device-dm-0-a-4175512149/ with a RAID rebuild, and some automated action occurring at night that confuses LVM into oblivion. The issue is difficult to narrow down because this “automated action” seems to result in all file systems being marked read-only. Syslog seems to continue working, but obviously cannot write useful data out to disk. Hence I have only been able to collect data on those rare times that I can actually log in when this http://www.centos.org/forums/viewtopic.php?t=53481 issue occurs. I was able to capture 2 points of data that seem to start out with the same error condition.This only seems to occur when a drive fails and the MegRAID rebuilds to the global hot spare, or if I force some action on the RAID which causes a drive fail and rebuild to an alternate disk (I had a few disks get SMART predictive failures and have been working to replace these with new). I initially thought this issue was related to smartd warning messages, however when I replaced the last drive with predictive failures, the rebuild triggered the same behavior.So what seems to be the pattern is that I kick off a rebuild (which takes many hours) and then sometime around midnight a systemd-udevd process kicks in and the system eventually ends up unresponsive. From the 2 times I was able to get on, these messages seem to be in common right at the time file systems go read-only:Jul 15 00:45:44 server1 kernel: megaraid_sas: scanning for scsi0...Jul 15 00:45:44 server1 systemd-udevd: failed to execute '/sbin/mdadm' '/sbin/mdadm -If sda5 --path pci-0000:09:00.0-scsi-0:2:0:0': Input/output errorJul 15 00:45:44 server1 systemd-udevd: failed to execute '/sbin/mdadm' '/sbin/mdadm -If sda4 --path pci-0000:09:00.0-scsi-0:2:0:0': Input/output errorJul 15 00:45:44 server1 systemd-udevd: failed to execute '/sbin/mdadm' '/sbin/mdadm -If sda3 --path pci-0000:09:00.0-scsi-0:2:0:0': Input
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of http://unix.stackexchange.com/questions/98208/i-o-errors-on-linux-lvm this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Unix & Linux Questions Tags Users Badges Unanswered Ask Question _ http://slated.org/device_mapper_weirdness Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Join them; it only takes a minute: Sign up Here's how error on it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top I/O errors on Linux LVM up vote 4 down vote favorite I have a CentOS 6 box with LVM setup and one of the PVs is a USB disk (I know). One of them is getting the error: Oct 30 10:57:07 alpha01 kernel: lost page error on device write due to I/O error on dm-3 Oct 30 10:57:07 alpha01 kernel: Buffer I/O error on device dm-3, logical block 4 Which is causing problems with all of the LVs on it. pvs shows the PV as unknown device. I can ls to the logical volumes and they show up in lvdisplay, but first I get a bunch of IO errors. I made sure the cables are secure between the USB drive. What should I do to get this back up and running for the meanwhile? Should I unmount each LV and run an fsck.ext4 on each one like fsck.ext4 -y /dev/vg1/lv_logvolname ? linux lvm fsck share|improve this question asked Oct 30 '13 at 15:06 Gregg Leventhal 2,29032752 In addition to fsck, if the external drive is SMART capable, checking the drive status/health and running the drive self tests may be useful. Backing up all the data may also be important. –rickhg12hs Oct 30 '13 at 15:44 add a comment| 1 Answer 1 active oldest votes up vote 2 down vote accepted I usually don't go the route of running an fsck and assume the disk is failing or has bad secto
Errors? Sun, 21/09/2008 - 2:06pm — Homer A couple of days ago I started getting these errors whenever I ran anything that scanned for logical volumes (Linux LVM2): Buffer I/O error on device dm-6, logical block 0 Buffer I/O error on device dm-7, logical block 0 Buffer I/O error on device dm-8, logical block 0 Buffer I/O error on device dm-9, logical block 0 My first reaction was panic, as I initially believed my HDD was failing, but after some investigation I realised that the above devices simply didn't exist. Yes, that is strange. Why would device mapper suddenly think there were devices there that ... well, weren't? I had a look in the /sys/block/ directory, and sure enough there were entries for dm-6; dm-7; dm-8 and dm-9, but looking in their respective slaves/ directory revealed the problem ... the soft links to the actual block devices were broken. Broken links to non-existent device nodes? It gets stranger. So then I thought I'd just try to delete those broken links, after all they pointed to non-existent hardware (for some reason that hadn't yet occurred to me), but alas the /sys/ directory is read-only, even for root. Hmm, what now? Then I suddenly remembered that a couple of days previously I'd inserted a USB thumb-drive, copied some files off it, then unplugged it. I did make sure that I'd unmounted it first, but I'd completely forgotten that logical volumes need to be explicitly deactivated first (using "lvm vgchange -an {volume group}"), before you remove them, and I hadn't done that. Oops. Unfortunately the lvm command simply returned a "device busy" error, so I found myself back at square one. Although the error messages were not fatal, since no actual hardware was damaged, and no data loss was likely, it was still very annoying to see these Buffer I/O error messages every time I did anything related to LVM. Rebooting would have fixed the problem of course, but I'm deeply averse to utilising Windows-style solutions on Linux systems that should be repairable without rebooting. Also, this is a server, and I hated the thought of losing uptime, and having to restart everything and check all the services were working properly, just to solve some stupid "non-existent logical volumes" problem. Sigh! It looked like I'd have to solve this problem the really old-fashioned way ... by going back to RTFM, or in my case several FMs. Some time later... I'd never played around with device mapper using the dmsetup command directly before, since I'd never needed to use anything other than the higher level vg* and lv* commands, but there's a first time for everything, I suppose, and this was one of those times. Apparently, stubbo