[SGVLUG] MDADM support

[Matthew Campbell]

Good morning everyone,


Through an unfortunate event (a visit to the comic book store near Caltech)
my data needs have rapidly grown.  My old data array (8 drives RAID-6)
needs to be expanded.

I have added 2 more drives to the server, but unfortunately they are
slightly smaller than the existing drives so they won't add directly with
mdadm --add.

I am trying to reduce the size of the existing drives but it does not seem
to work.  I am getting no log messages or other indication as to why.  Do
you have any suggestions?

matt at aslan:160% sudo mount /Backups
matt at aslan:161% sudo df -k /Backups
Filesystem       1K-blocks        Used Available Use% Mounted on
/dev/md0       17469360128 16917599856 549035664  97% /Backups
matt at aslan:162% sudo btrfs filesystem resize -100g /Backups
Resize '/Backups' of '-100g'
0.000u 160.068s 1:06:09.85 4.0% 0+0k 208543776+225062784io 0pf+0w
matt at aslan:163% time sudo btrfs scrub start -Bd /Backups
scrub device /dev/md0 (id 1) done
        scrub started at Mon Oct 20 00:27:31 2014 and finished after 29330
seconds
        total bytes scrubbed: 15.75TiB with 0 errors
0.185u 4877.358s 8:08:49.71 16.6%       0+0k 33835288864+47080io 10pf+0w
matt at aslan:164% df -k /Backups
Filesystem       1K-blocks        Used Available Use% Mounted on
/dev/md0       17364502528 16917585648 444184208  98% /Backups
matt at aslan:165% sudo umount /Backups
matt at aslan:166% sudo mdadm --grow /dev/md0 --size=2928268288
mdadm: component size of /dev/md0 unchanged at 2929036288K
matt at aslan:167%

Note "unchanged" in the last line of output.

Thanks for any thoughts...

Matt
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