Hi all, can anybody help me with this? Thanks, Roman Dissauer > Anfang der weitergeleiteten Nachricht: > > Betreff: Millions of mismatches after scrubbing lvm raid > Von: Roman Dissauer <roman@dissauer.net> > Datum: 19. März 2015 22:54:02 MEZ > An: linux-lvm@redhat.com > > Hi all, > > I’m on centos 7 and have several logical volumes on my machine. Yesterday I scrubbed the raid1/raid10 logical volumes for the first time after 6 months. Scrubbing reported multi million mismatches on three of my logical volumes (the older ones). Recently created lvs didn’t have any mismatches though. Now I raised some questions: > > 1. Is this a normal behaviour of raid1/raid10 to have this much mismatches? > 2. Is it safe to do "lvchange --syncaction repair“ on this logical volumes? > 3. How does lvm know which one is the „good“ side of the raid1? > 4. Is it a good idea to do „lvchange --resync“ from time to time? > 5. Is it more reliable to change the lvm from raid10 to raid6? > > maybe someone can help me answering my questions. > enclosed you’ll find some more information. > > Thanks, > Roman Dissauer > > > Here is the scrub output: > LV VG Attr Start SSize #Str Type Stripe Chunk Mismatches SyncAction Cpy%Sync > data vg0 rwi-aor-m- 0 3,49t 4 raid10 512,00k 0 895444480idle 100,00 > owncloud vg0 rwi-aor-m- 0 250,00g 2 raid1 0 0 285961472 idle 100,00 > root vg0 rwi-aor-m- 0 30,00g 4 raid1 0 0 16501376 idle 100,00 > > on data this is about 0.1% mismatch of the volume > on owncloud this is about 0.4% mismatch of the volume > on root this is about 0.2% mismatch of the volume > > > And here the output of the system storage manager: > --------------------------------------------------------------- > Device Free Used Total Pool Mount point > --------------------------------------------------------------- > /dev/sda 2.73 TB PARTITIONED > /dev/sda1 873.50 GB 1.88 TB 2.73 TB vg0 > /dev/sdb 2.73 TB > /dev/sdb1 860.84 GB 1.89 TB 2.73 TB vg0 > /dev/sdc 2.73 TB > /dev/sdc1 10.82 GB 2.72 TB 2.73 TB vg0 > /dev/sdd 2.73 TB > /dev/sdd1 10.82 GB 2.72 TB 2.73 TB vg0 > /dev/sde 7.32 GB > /dev/sde1 500.00 MB /boot > /dev/sdg 0.00 KB 931.51 GB 931.51 GB backup > /dev/sdh 0.00 KB 2.73 TB 2.73 TB backup > --------------------------------------------------------------- > ------------------------------------------------- > Pool Type Devices Free Used Total > ------------------------------------------------- > backup lvm 2 0.00 KB 3.64 TB 3.64 TB > vg0 lvm 4 1.71 TB 9.20 TB 10.92 TB > ------------------------------------------------- > ------------------------------------------------------------------------------------------- > Volume Pool Volume size FS FS size Free Type Mount point > ------------------------------------------------------------------------------------------- > /dev/backup/backup backup 3.64 TB ext4 3.64 TB 509.38 GB linear /backup > /dev/vg0/data vg0 3.49 TB ext4 3.49 TB 595.34 GB raid10 /data > /dev/vg0/home vg0 200.00 GB ext4 200.00 GB 128.58 GB raid10 /home > /dev/vg0/owncloud vg0 250.00 GB xfs 249.99 GB 145.01 GB raid1 /var/owncloud > /dev/vg0/jail vg0 10.00 GB ext4 10.00 GB 6.71 GB raid1 /jail > /dev/vg0/fotos vg0 500.00 GB ext4 500.00 GB 456.07 GB raid1 /fotos > /dev/vg0/virtswap vg0 20.00 GB ext4 20.00 GB 17.89 GB striped /virt/swap > /dev/vg0/iso vg0 10.00 GB ext4 10.00 GB 8.05 GB linear /virt/iso > /dev/vg0/images vg0 100.00 GB ext4 100.00 GB 83.09 GB raid1 /virt/images > /dev/vg0/root vg0 30.00 GB xfs 29.99 GB 5.79 GB raid1 / > /dev/vg0/swap vg0 8.00 GB striped > /dev/sde1 500.00 MB xfs 496.67 MB 240.59 MB /boot > ------------------------------------------------------------------------------------------- > > Disks are WD RED 3TB > > and here some revision numbers: > uname -r > 3.10.0-123.20.1.el7.x86_64 > > lvm version > LVM version: 2.02.105(2)-RHEL7 (2014-03-26) > Library version: 1.02.84-RHEL7 (2014-03-26) > Driver version: 4.27.0 > > _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
