On 05/08/2014 05:50 AM, Russell Coker wrote:
I've got a server/workstation (KDE desktop and file server) running kernel
3.14.1 from the Debian package 3.14-trunk-amd64.
It was running well until I decided to do a full balance of the BTRFS RAID-1
array of 3TB SATA disks (which hadn't been balanced before due to previous
kernels performing badly with scrub or balance). I canceled the balance after
about 5 days when it had been claiming to be about 65% done for a day while
doing a lot of disk IO.
Can I see dmesg/messages for the time that this was running for so long?
After canceling the balance the performance of the array has been poor. It
has a cron job that runs twice a week to rsync data from a Maildir based mail
server that currently has 2401473 Inodes in use according to ZFS on the mail
server (unfortunately BTRFS won't tell me how many Inodes are in use). The
cron job does an "rsync -va" type backup WITHOUT the -c option, so we're
basically doing a recursive stat on all files and then transferring new files
(Dovecot index files are excluded so files tend never to change). After the
rsync is complete "cp -rl" is used to make a backup of the tree.
The cp -rl usually takes something less than 30 minutes (not long enough for
me to even notice) but today cp has been running for 5.5 hours and seems to be
about 3/5 done (9000/15000 subdirectories linked).
Sysrq+w while it's running, just one and then wait a while and then
another. Thanks,
Josef
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