Tony, Can I make a suggestion to you? Instead of trying to do the mirroring in LVM, build yourself an MD mirror, then layer LVM ontop of that instead. You get nice seperation. You can also take that /dev/sdb3, make it into an MD RAID1 array with just one device, add it into the VG, then move the LVs onto the new device. Once that's done, you remove the sda3 from the VG, then add it into the MD device. Something like this... > mdadm --create /dev/md1 --level=1 --raid-devices=2 /dev/sdb3 missing > cat /proc/mdstat > pvcreate -v /dev/md1 > vgextend -v vg0 /dev/md1 > pvmove -v sda3 > vgreduce -v vg0 sda3 > mdadm --add /dev/md0 /dev/sda3 > cat /proc/mdstat And you will now be mirrored, etc. Tony> I'm trying to convert one of my logical volumes to be RAID1 mirrored Tony> using LVM on my Ubuntu 15.10 system. When I do, the command lvs shows Tony> the mirror set is 100% synchronized immediately. syslog show a failure Tony> saying one of the devices in the mirror set has failed and it reverts to Tony> a single device mirror set. Tony> Errors include saying attempt to access beyond end of device. There is Tony> also an error showing code=-5 for 'super_written'. A full extract of Tony> syslog is below. Tony> The volume group is configured so: Tony> root@the-circus:~# pvs Tony> PV VG Fmt Attr PSize PFree Tony> /dev/sda3 vg0 lvm2 a-- 2.73t 1.09t Tony> /dev/sdb3 vg0 lvm2 a-- 2.73t 2.68t Tony> So it's trying to create the mirror devices on /dev/sdb3. Tony> The disks are 3TB Seagate Barracuda disks. They both brand new. Tony> Experimentation shows I only get these errors for logical volumes bigger Tony> than 31GB, anything smaller behaves correctly. Tony> My version of Ubuntu: Tony> # lsb_release -a Tony> No LSB modules are available. Tony> Distributor ID: Ubuntu Tony> Description: Ubuntu 15.10 Tony> Release: 15.10 Tony> Codename: wily Tony> Kernel is: Tony> # uname -a Tony> Linux the-circus 4.2.0-18-generic #22-Ubuntu SMP Fri Nov 6 18:25:50 UTC Tony> 2015 x86_64 x86_64 x86_64 GNU/Linux Tony> Anyone any ideas? I've googled this until the cows come home but cannot Tony> find anything helpful. Tony> Regards, Tony> Tony. Tony> Nov 21 17:29:52 the-circus kernel: [ 231.538111] device-mapper: raid: Tony> Loading target version 1.7.0 Tony> Nov 21 17:29:52 the-circus kernel: [ 231.541976] device-mapper: raid: Tony> Superblocks created for new array Tony> Nov 21 17:29:52 the-circus kernel: [ 231.542894] md/raid1:mdX: not Tony> clean -- starting background reconstruction Tony> Nov 21 17:29:52 the-circus kernel: [ 231.542897] md/raid1:mdX: active Tony> with 2 out of 2 mirrors Tony> Nov 21 17:29:52 the-circus kernel: [ 231.542899] Choosing daemon_sleep Tony> default (5 sec) Tony> Nov 21 17:29:52 the-circus kernel: [ 231.542903] created bitmap (50 Tony> pages) for device mdX Tony> Nov 21 17:29:52 the-circus kernel: [ 231.542906] attempt to access Tony> beyond end of device Tony> Nov 21 17:29:52 the-circus kernel: [ 231.542908] dm-7: rw=13329, Tony> want=18446744073709551608, limit=8192 Tony> Nov 21 17:29:52 the-circus kernel: [ 231.542909] md: super_written gets Tony> error=-5, uptodate=0 Tony> Nov 21 17:29:52 the-circus kernel: [ 231.542920] md/raid1:mdX: Disk Tony> failure on dm-8, disabling device. Tony> Nov 21 17:29:52 the-circus kernel: [ 231.542920] md/raid1:mdX: Tony> Operation continuing on 1 devices. Tony> Nov 21 17:29:52 the-circus kernel: [ 231.542933] attempt to access Tony> beyond end of device Tony> Nov 21 17:29:52 the-circus kernel: [ 231.542936] dm-5: rw=13329, Tony> want=18446744073709551608, limit=8192 Tony> Nov 21 17:29:52 the-circus kernel: [ 231.542939] md: super_written gets Tony> error=-5, uptodate=0 Tony> Nov 21 17:29:52 the-circus kernel: [ 231.569851] attempt to access Tony> beyond end of device Tony> Nov 21 17:29:52 the-circus kernel: [ 231.569859] dm-5: rw=13329, Tony> want=18446744073709551608, limit=8192 Tony> Nov 21 17:29:52 the-circus kernel: [ 231.569863] md: super_written gets Tony> error=-5, uptodate=0 Tony> Nov 21 17:29:52 the-circus kernel: [ 231.596802] mdX: bitmap file is Tony> out of date, doing full recovery Tony> Nov 21 17:29:52 the-circus kernel: [ 231.712193] mdX: bitmap Tony> initialized from disk: read 4 pages, set 102400 of 102400 bits Tony> Nov 21 17:29:52 the-circus systemd[1]: Started Device-mapper event daemon. Tony> Nov 21 17:29:52 the-circus dmeventd[3132]: dmeventd ready for processing. Tony> Nov 21 17:29:52 the-circus kernel: [ 231.786858] RAID1 conf printout: Tony> Nov 21 17:29:52 the-circus kernel: [ 231.786863] --- wd:1 rd:2 Tony> Nov 21 17:29:52 the-circus kernel: [ 231.786866] disk 0, wo:0, o:1, Tony> dev:dm-6 Tony> Nov 21 17:29:52 the-circus kernel: [ 231.786868] disk 1, wo:1, o:0, Tony> dev:dm-8 Tony> Nov 21 17:29:52 the-circus kernel: [ 231.793942] RAID1 conf printout: Tony> Nov 21 17:29:52 the-circus kernel: [ 231.793947] --- wd:1 rd:2 Tony> Nov 21 17:29:52 the-circus kernel: [ 231.793949] disk 0, wo:0, o:1, Tony> dev:dm-6 Tony> Nov 21 17:29:52 the-circus kernel: [ 231.794033] md: resync of RAID Tony> array mdX Tony> Nov 21 17:29:52 the-circus kernel: [ 231.794037] md: minimum Tony> _guaranteed_ speed: 1000 KB/sec/disk. Tony> Nov 21 17:29:52 the-circus kernel: [ 231.794039] md: using maximum Tony> available idle IO bandwidth (but not more than 200000 KB/sec) for resync. Tony> Nov 21 17:29:52 the-circus kernel: [ 231.794042] md: using 128k window, Tony> over a total of 52428800k. Tony> Nov 21 17:29:52 the-circus kernel: [ 231.794196] md: mdX: resync done. Tony> Nov 21 17:29:53 the-circus kernel: [ 232.037242] RAID1 conf printout: Tony> Nov 21 17:29:53 the-circus kernel: [ 232.037248] --- wd:1 rd:2 Tony> Nov 21 17:29:53 the-circus kernel: [ 232.037251] disk 0, wo:0, o:1, Tony> dev:dm-6 Tony> Nov 21 17:29:53 the-circus lvm[3132]: Monitoring RAID device vg0-testlv Tony> for events. Tony> Nov 21 17:29:53 the-circus lvm[3132]: Device #1 of raid1 array, Tony> vg0-testlv, has failed. Tony> Nov 21 17:29:53 the-circus lvm[3132]: Use 'lvconvert --repair Tony> vg0/testlv' to replace failed device. Tony> -- Tony> Tony Arnold, IT Security Analyst, University of Manchester. Tony> T: +44 (0) 161 275 6093, F: +44 (0) 705 344 3082, Tony> M: +44 (0) 773 330 0039, E: tony.arnold@manchester.ac.uk Tony> -- Tony> ubuntu-users mailing list Tony> ubuntu-users@lists.ubuntu.com Tony> Modify settings or unsubscribe at: Tony> https://lists.ubuntu.com/mailman/listinfo/ubuntu-users Tony> _______________________________________________ Tony> linux-lvm mailing list Tony> linux-lvm@redhat.com Tony> https://www.redhat.com/mailman/listinfo/linux-lvm Tony> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ _______________________________________________ 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/
