On 7/1/2010 12:23 PM, Lo Zio wrote:
Thanks roy, I read a lot around and also was thinking it was a dedup-related problem.
Although I did not find any indication of how many RAM is enough, and never find
something saying "Do not use dedup, it will definitely crash your server". I'm
using a Dell Xeon with 4 Gb of RAM, maybe it is not an uber-server but it works really
well (when it is not hung, I mean).
Do you have an idea about the optimal config to have 1,5T of available space in
10 datasets (5 deduped), and 10 rotating snapshots?
Thanks
Take a look at the archives for these threads:
Dedup RAM requirements, vs. L2ARC?
http://mail.opensolaris.org/pipermail/zfs-discuss/2010-June/042661.html
Dedup performance hit
http://mail.opensolaris.org/pipermail/zfs-discuss/2010-June/042235.html
4GB of RAM is likely to be *way* too small to run dedup with your setup.
You almost certainly need a SSD for L2ARC, and probably at least 2x the
RAM.
The "hangs" you see are likely the Dedup Table being built on-the-fly
from the datasets, which is massively I/O intensive.
--
Erik Trimble
Java System Support
Mailstop: usca22-123
Phone: x17195
Santa Clara, CA
Timezone: US/Pacific (GMT-0800)
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