[zfs-discuss] I see 50% and more cache miss on ZFS with BackupPC

Arman Khalatyan arm2arm at gmail.com
Fri Sep 27 12:17:36 EDT 2013


Hello,
I use BackupPC without compression.
zfs is configured with zle compression, sync=disabled, noatime, noxattr
with 16 SATA disks + 512GB SSD cache.
on  bin/arcstat.pl 2
I see:
  time  read  miss  miss%  dmis  dm%  pmis  pm%  mmis  mm%  arcsz     c
18:16:47     2     1     50     1   50     0    0     0    0    15G   15G
18:16:49  1.1K   532     50   532   50     0    0     3    0    15G   15G
18:16:51  1.1K   560     50   560   50     0    0     1    0    15G   15G
18:16:53  1.3K   680     50   549   45   131  100   149   18    15G   15G

Are there way to optimize zfs for BackupPC usages?
Thanks,
Arman.

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