RAID 5 shrink array

CptHowdy · 1. April 2016

I believe my problem is unique.

Code

root@openmediavault:~# blkid
/dev/sda1: UUID="af782114-bc98-4558-8046-1cba921ff1a5" TYPE="ext4"
/dev/sda5: UUID="7c81c3d6-63ce-47cd-b562-0574f02b1cc3" TYPE="swap"
/dev/sdc: UUID="a8dea49c-6d89-522a-2e18-e7c4d0ebe820" UUID_SUB="859e1f6a-7f93-41                                               7c-8a7c-1c565c996b53" LABEL="openmediavault:OMV2" TYPE="linux_raid_member"
/dev/sdd: UUID="a8dea49c-6d89-522a-2e18-e7c4d0ebe820" UUID_SUB="0e1243f5-a933-09                                               fe-810c-6422953f5766" LABEL="openmediavault:OMV2" TYPE="linux_raid_member"
/dev/sde: UUID="a8dea49c-6d89-522a-2e18-e7c4d0ebe820" UUID_SUB="cd1a5556-e57c-3e                                               49-ad6e-3155129fb320" LABEL="openmediavault:OMV2" TYPE="linux_raid_member"
/dev/md8: LABEL="Internal2" UUID="5a83be57-f975-4367-b2bd-764905a6a6f9" TYPE="xf                                               s"
/dev/sdb: UUID="a8dea49c-6d89-522a-2e18-e7c4d0ebe820" UUID_SUB="87e57a4b-c17a-81                                               b1-d717-487576c198dc" LABEL="openmediavault:OMV2" TYPE="linux_raid_member"
/dev/sdh: UUID="a8dea49c-6d89-522a-2e18-e7c4d0ebe820" UUID_SUB="b595c6f9-46b5-7f                                               0d-a8a2-3b047dc935d8" LABEL="openmediavault:OMV2" TYPE="linux_raid_member"
/dev/sdi: UUID="a8dea49c-6d89-522a-2e18-e7c4d0ebe820" UUID_SUB="a40f35e3-e1e1-d1                                               05-32db-43de9f9464a1" LABEL="openmediavault:OMV2" TYPE="linux_raid_member"
/dev/sdg1: LABEL="ID2" UUID="94a293dc-3f3c-4a8e-b73c-e2b62dfe60f3" TYPE="xfs"

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Code

root@openmediavault:~# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md8 : active raid5 sdi[5] sdh[4] sdc[0] sdb[3] sde[2] sdd[1]
      19534435840 blocks super 1.2 level 5, 512k chunk, algorithm 2 [6/6] [UUUUUU]


unused devices: <none>

My main goal is to use LUKS in which I need to shrink my array from 6 drives to 3 and create a 2nd RAID5, Install LUKS, then rsync data, then wipe remaining 3 drives, then readd those to the 2nd array. So is this even possible using the xfs file system?

subzero79 · 1. April 2016

AFIAK one of the things that xfs doesn't allow is Fs shrink. @ryecoaaron can confirm.

ryecoaaron · 1. April 2016

Nope, can't shrink XFS.

CptHowdy · 1. April 2016

can the fs be converted to something like ext4 then shrink?

ryecoaaron · 1. April 2016

Nope.

CptHowdy · 3. April 2016

just an update for anyone else with same unique circumstances, to solve this, I ended up hooking back up some old HDD that were removed from OMV a few weeks ago, set-up a 2nd RAID array, copied data, then turned on my LUKS encryption, then copy data back. . . . sounds like alot of work and it is, but worth it if i actually "NEED" my data drives to be encrypted one day

CptHowdy · 3. April 2016

apparently I broke something. . . .
this is what happens when access web interface

Code

Error #3008:
exception 'OMVException' with message 'Failed to load configuration (Warning 1549: failed to load external entity "/etc/openmediavault/config.xml" (line=0, column=0))' in /usr/share/php/openmediavault/config.inc:577
Stack trace:
#0 /usr/share/php/openmediavault/env.inc(22): require_once()
#1 /var/www/openmediavault/index.php(23): require_once('/usr/share/php/...')
#2 {main}

re-wrote config via:

Code

omv-mkconf fstab

and that made no difference.

wondering if i should just reinstall OMV and start from scratch?

davidh2k · 3. April 2016

Somethings wrong with your config.xml, is it still there?

ls -la /etc/openmediavault/

Greetings
David

CptHowdy · 3. April 2016

Code

root@openmediavault:~# ls -la /etc/openmediavault/
total 144
drwxr-xr-x  2 openmediavault openmediavault  4096 Apr  3 01:21 .
drwxrwxr-x 98 root           root            4096 Apr  3 10:21 ..
-rw-------  1 root           root           35821 Apr  2 23:50 config.xml
-rw-------  1 root           root           32275 Apr  3 01:09 config.xml.2
-rw-r--r--  1 openmediavault openmediavault 67028 Mar 14  2014 php.ini

i modified the config.xml and saved it as config.xml.2 so the orig one should be orig one the *.xml.2 is my modified one

CptHowdy · 16. April 2016

well somewhere between the latest update to OMV and/or setting up the LUKS i see a 30% drop in read speed at best. . . . but just today i ran hdparm on the LUKS array and the other. . . . maybe my bottleneck is in the IOCREST SATA controllers. Any input would be appreciated.

Code

root@openmediavault:~# hdparm -t /dev/sda


/dev/sda:
 Timing buffered disk reads: 160 MB in  3.05 seconds =  52.38 MB/sec
root@openmediavault:~# hdparm -t /dev/md126


/dev/md126:
 Timing buffered disk reads: 886 MB in  3.01 seconds = 294.45 MB/sec
root@openmediavault:~# hdparm -t /dev/mapper/md127-crypt


/dev/mapper/md127-crypt:
 Timing buffered disk reads: 300 MB in 33.73 seconds =   8.89 MB/sec
root@openmediavault:~#

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RAID 5 shrink array

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