Kjetil and Richard thanks for this.
Kjetil Torgrim Homme wrote:
Bogdan Ćulibrk <b...@default.rs> writes:
What are my options from here? To move onto zvol with greater
blocksize? 64k? 128k? Or I will get into another trouble going that
way when I have small reads coming from domU (ext3 with default
blocksize of 4k)?
yes, definitely. have you considered using NFS rather than zvols for
the data filesystems? (keep zvol for the domU software.)
That makes sense. Will it be useful to simply add new drive to domU
backed with greater blocksize zvol or maybe vmdk file? Does it have to
be nfs backend?
it's strange that you see so much write activity during backup -- I'd
expect that to do just reads... what's going on at the domU?
generally, the best way to improve performance is to add RAM for ARC
(512 MiB is *very* little IMHO) and SSD for your ZIL, but it does seem
to be a poor match for your concept of many small low-cost dom0's.
Writes are coming from backup packing before transfering on real backup
location. Most likely this is the main reason for whole problem.
One more thing regarding SSD, will be useful to throw in additional
SAS/SATA drive in to serve as L2ARC? I know SSD is the most logical
thing to put as L2ARC, but will conventional drive be of *any* help in
L2ARC?
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