Buffer I/o Error On Device Dm-6
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Buffer I O Error On Device Sr0
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Kernel Buffer I O Error On Device
Links Eclipse Support Site Admin Can I safely ignore I/O errors on dm devices? The root user of a system using may occasionally receive a message similar to the following in the daily logwatch email: --------------------- Kernel Begin ------------------------ WARNING: Kernel Errors Present Buffer I/O error on device dm-7, ...: 11 Time(s) EXT3-fs error (device dm-7): e ...: 90 Time(s) lost page write due to I/O error on dm-7 ...: linux buffer i o error on device 11 Time(s) Likewise, you may notice similar error messages in the /var/log/messages file: May 16 04:04:52 eclipse kernel: lost page write due to I/O error on dm-20 May 16 04:04:52 eclipse kernel: Buffer I/O error on device dm-20, logical block 0 May 16 04:04:52 eclipse kernel: lost page write due to I/O error on dm-20 May 16 04:04:52 eclipse kernel: Buffer I/O error on device dm-20, logical block 0 May 16 04:04:52 eclipse kernel: lost page write due to I/O error on dm-20 May 16 04:04:52 eclipse kernel: Buffer I/O error on device dm-20, logical block 0 May 16 04:04:52 eclipse kernel: lost page write due to I/O error on dm-20 If the device mapper (dm-n) device(s) mentioned in the messages refer to a snapshot logical volume (LV), these messages can be ignored. By their definition, snapshot LVs are temporal in nature; they are created, destroyed and expire when changes written to them exceed their predefined capacity. To determine if the dm device points to a snapshot LV: First, locate the "dm" device number in the logs (in our example, 20): [root@eclipse ~]# grep "I/O error" /var/log/messages May 16 04:04:52 eclipse kernel: Buffer I/O error on device dm-20, logical block 1545 Ma
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 I O Error On Device Sda
Quote Postby jamesNJ » 2015/07/24 17:25:21 Hello all,I have a problem with a large kernel buffer i/o error on device dm-2 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 dm-3 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://kb.eclipseinc.com/kb/can-i-safely-ignore-io-errors-on-dm-devices/ 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': In
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 http://slated.org/device_mapper_weirdness device dm-7, logical block 0 Buffer I/O error on device dm-8, logical block 0 Buffer http://kb.open-e.com/Buffer-I/O-Errors_139.html 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, error on 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/ error on device 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
you enjoy this article? Share it! Article ID: 139 Last updated: 13 Feb, 2009 Print Email to friend Views: 11636 Buffer I/O Errors Rating: 9.0000 / 10 Votes: 2 Posted: 13 Feb, 2009 by: Updated: 13 Feb, 2009 by: If you receive the following messages listed in the example below, it could be related to a RAID Issue. Most of these errors could be found in dmesg or dmesg.2 or sent to you by email notification If you receive these errors, Please check your RAID Controller and your RAID array. Before removing a disk drive please verify that you are removing the correct failed disk drive, as removing the incorrect disk drive may break your RAID. While the RAID array is running in an unstable or degraded condition, unexpected results can occur. It can lead to filesystem errors and data loss. It is best practice to fix this issue as soon as possible. After you fix your RAID: Please click on the remove button, then let the system run for a bit and download and send us your system log files for us to check to see if there are any other issues. Logs are located here STATUS -> HARDWARE -> Logs. The “Logical block” or “sectors” in most instances in the examples below will refer to an issue with one or more of the disk drives. The following are a few examples of error messages that were caused by either a bad disk drive or a problem with the RAID controller. Example 1 Buffer I/O error on device dm-6, logical block 235528 lost page write due to I/O error on dm-6 sd 1:0:0:0: rejecting I/O to offline device Example 2 (failed disk drive) end_request: I/O error, dev sdf, sector 7007993 Buffer I/O error on device dm-3, logical block 3464313 ata6: translated ATA stat/err 0x51/40 to SCSI SK/ASC/ASCQ 0x3/11/04 ata6: status=0x51 { DriveReady SeekComplete Error } ata6: error=0x40 { UncorrectableError } ata6: translated ATA stat/err 0x51/40 to SCSI SK/ASC/ASCQ 0x3/11/04 ata6: status=0x51 { DriveReady SeekComplete Error } sd 5:0:0:0: SCSI error: return code = 0x8000002 sdf: Current: sense key=0x3 ASC=0x11 ASCQ=0x4 Dec 26 14:35:27 nas kernel: end_request: I/O error, dev sdf, sector 7007983 Example 3 Buffer I/O error on device dm-4, logical block 61520 lost page write due to I/O error on dm-4 sd 1:2:0:0: rejecting I/O to offline device lost page write due to I/O error on dm-4 This example as it turned out was a bad RAID controller. arcmsr0 abort device comm