search for: mismatch_cnt

CentOS 6.3, x86_64. I have noticed when building a new software RAID-6 array on CentOS 6.3 that the mismatch_cnt grows monotonically while the array is building: # cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] md11 : active raid6 sdg[5] sdf[4] sde[3] sdd[2] sdc[1] sdb[0] 3904890880 blocks super 1.2 level 6, 512k chunk, algorithm 2 [6/6] [UUUUUU] [==================>..] resync = 9...

...ture" the weekly raid partition check. we've got a lot's of server with raid1 system and i already try to configure them not to send these messages, but i'm not able ie. i already add to the SKIP_DEVS all of my swap partitions (since i read it on linux-kernel list that there can be mismatch_cnt even though i still not understand why?). but even the data partitions (ie. all of my servers all raid1 partitions) produce this error (ie. ther mismatch_cnt is never 0 at the weekend). and this cause all of my raid1 partitions are rebuild during the weekend. and i don't like it:-( so my questi...

Saturday I did an upgrade from 5.3 (original install) to 5.4. Saturday night, /etc/cron.weekly reported the following: /etc/cron.weekly/99-raid-check: WARNING: mismatch_cnt is not 0 on /dev/md0 md0 holds /boot and resides, mirrored, on sda1 and sdb1. md1 holds an LVM volume containing the remaining filesytems, including swap. The underlying hardware is just a few months hold, has passed the usual memtest stuff, and has been running 5.3 well for a few months. I'...

this has never happened to me before, and I'm somewhat at a loss. got a email from the cron thing... /etc/cron.weekly/99-raid-check: WARNING: mismatch_cnt is not 0 on /dev/md10 WARNING: mismatch_cnt is not 0 on /dev/md11 ok, md10 and md11 are each raid1's made from 2 x 72GB scsi drives, on a dell 2850 or something dual single-core 3ghz server. these two md's are in turn a striped LVM volume group dmesg shows.... md: syncing RAID...

Does software raid 1 compare checksums or otherwise verify that the same bits are coming from both disks during reads? What I'm interested in, is whether bit errors that were somehow undetected by the hardware would be detected by the raid 1 software. Thanks, Nataraj

Hello, since weeks I was ignoring this warning at my CentOS 5.6/64 bit machine - /etc/cron.weekly/99-raid-check: WARNING: mismatch_cnt is not 0 on /dev/md0 in the hope that the software RAID will slowly repair itself. I also had executed "echo 100000 > /proc/sys/dev/raid/speed_limit_max" on the advice from the mailing list. But now my web server is offline - I had to boot it remotely with rescue system. Does anybo...

Hi list! I recently butchered my filesystem, and I was wondering if anyone knows how to help. Problem: My filesystem is screwed up, and I can''t mount it at all right now. In the logs, the problem begins around 45s. Background: I''m running a 6x4TB RAID5 array using md. I have a few virtual machines using said array, and one of them is a btrfs storage server. I ran into some

...unable to handle kernel NULL pointer dereference at 00000008 [ 341.606359] IP: [<f1ddb0a4>] _scsih_qcmd+0x412/0x4d0 [mpt2sas] [ 341.612252] *pdpt = 0000000001466007 *pde = 0000000000000000 [ 341.618059] Oops: 0000 [#1] SMP [ 341.621352] last sysfs file: /sys/devices/virtual/block/md0/md/mismatch_cnt [ 341.628376] Modules linked in: xen_evtchn xenfs fuse 8021q garp bridge stp reiserfs loop snd_pcm snd_timer snd soundcore snd_page_alloc evdev psmouse dcdbas joydev pcspkr serio_raw ioatdma dca power_meter processor button acpi_processor ext3 jbd mbcache dm_mod raid1 md_mod sd_mod crc_t10dif usbh...