Linux Buffer I O Error On Device Dm
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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 ...: 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 lost page write due to i/o error on dm-0 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 May 16 04:04:52 eclipse kernel: lost page write due to I/O error on dm-20 Next, list the /dev/mapper/* devices, noting the minor device numbers of each, which correspond with the "dm" device number (in our example, 20): [root@eclipse ~]# ls -l /dev/mapper/ | grep 20 brw-rw---- 1 root disk 253, 20 May 16 1
Common F23 Bugs Common F24 Bugs Communicate with Fedora The Documents Bug Reports Fedora Update System (Bodhi) Fedora Build System (Koji) Official Spins FedoraForum.org > Fedora 23/24 buffer i/o error on device dm-7 logical block > Hardware & Laptops Buffer I/O error on device dm-0 FedoraForum Search buffer i/o error on device logical block User Name Remember Me? Password Forgot Password? Join Us! Register All Albums FAQ Today's Posts Search Hardware & buffer i/o error on dev dm-0 logical block Laptops Help with your hardware, including laptop issues Google™ Search FedoraForum Search Red Hat Bugzilla Search Search Forums Show Threads Show Posts Tag Search Advanced Search Go to Page... http://kb.eclipseinc.com/kb/can-i-safely-ignore-io-errors-on-dm-devices/ Thread Tools Search this Thread Display Modes #1 1st March 2016, 06:03 PM pmeni Offline Registered User Join Date: Mar 2016 Location: AR Posts: 2 Buffer I/O error on device dm-0 Hi, I have problems with Fedora 23, (Fedora 22 works fine, doesn't have this kind of errors), with no reason the disk fail an run into read-only. I changed the http://forums.fedoraforum.org/showthread.php?t=309039 disk to a new one and the same issue. Anyone have this errors?, May be I can try to install Fedora whit no LVM and see if this solve the problem. Tested with this kernel versions: kernel.x86_64 4.3.5-300.fc23 kernel.x86_64 4.4.2-301.fc23 Full log: http://ur1.ca/ol96o Mar 01 12:51:48 NORC kernel: ata6.00: exception Emask 0x0 SAct 0x400 SErr 0x0 action 0x6 frozen Mar 01 12:52:48 NORC kernel: ata6.00: failed command: WRITE FPDMA QUEUED Mar 01 12:52:48 NORC kernel: ata6.00: cmd 61/50:50:08:6c:1b/00:00:06:00:00/40 tag 10 ncq 40960 out res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout) Mar 01 12:52:48 NORC kernel: ata6.00: status: { DRDY } Mar 01 12:52:48 NORC kernel: ata6: hard resetting link Mar 01 12:52:48 NORC kernel: ata6: link is slow to respond, please be patient (ready=0) Mar 01 12:52:48 NORC kernel: ata6: COMRESET failed (errno=-16) Mar 01 12:52:48 NORC kernel: EXT4-fs warning (device dm-0): ext4_end_bio:329: I/O error -5 writing to inode 2368435 (offset 0 size 0 starting block 4954560) Mar 01 12:52:48 NORC kernel: Buffer I/O error on device dm-0, logical block 4954560 Mar 01 12:52:48 NORC kernel: EXT4-fs warning (device dm-0): ext4_end_bio:329: I/O error -5 writing to inode 2368435 (offset 0 siz
编辑 Linux服务器日志(Oracle Linux Server release 5.7)里面出现了一些"Buffer I/O error on device dm-4, logical block 0"之类的错误,如下所示: Jul 3 02:33:24 localhost kernel: Buffer I/O error on device dm-4, logical http://www.cnblogs.com/kerrycode/p/5711663.html block 0 Jul 3 02:33:24 localhost kernel: Buffer I/O error on device dm-4, logical block 1 Jul 3 02:33:24 localhost kernel: Buffer I/O error on device dm-4, logical block 2 Jul http://slated.org/device_mapper_weirdness 3 02:33:24 localhost kernel: Buffer I/O error on device dm-4, logical block 3 Jul 3 02:33:24 localhost kernel: Buffer I/O error on device dm-4, logical block 0 Jul 3 02:33:24 o error localhost kernel: Buffer I/O error on device dm-4, logical block 0 Jul 3 02:33:24 localhost kernel: Buffer I/O error on device dm-4, logical block 1 Jul 3 02:33:24 localhost kernel: Buffer I/O error on device dm-4, logical block 2 Jul 3 02:33:24 localhost kernel: Buffer I/O error on device dm-4, logical block 3 在这篇"Buffer I/O Error in /var/log/messages"博客里面的英文介绍: A server o error on using a LUN, which is presented by a storage array through fabric channels, may show buffer I/O errors while the server is booting or commands such as fdisk and vgscan are being run. The access can be a read or write attempt. These messages are sometimes harmless. When using PowerPath, these errors are suppressed. However, in the case where Linux native multipathing is used, there is no automatic provision for filtering these messages. The errors can occur when using an active/passive storage array, such as EMC Clarion series. These types of SANs contain two storage processors. LUNs are assigned to only one of the processors at the time of LUN creation. The LUN can receive I/O only via that one processor. The other processor is passive; it acts as a backup, ready to receive I/O if the active controller fails, or if all paths to the LUN via the active controller fails. Paths to the LUN going via the passive controller are passive paths and will generate an I/O errors should I/O be sent over them. At bootup, the kernel's SCSI mid-l
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