Matt Cohen wrote:
> We have a 32 GB RAM server running about 14 zones. There are multiple
> databases, application servers, web servers, and ftp servers running in the
> various zones.
>
> I understand that using ZFS will increase kernel memory usage, however I am a
> bit concerned at this point.
>
> [EMAIL PROTECTED]:~/zonecfg #mdb -k
>
> Loading modules: [ unix krtld genunix specfs dtrace uppc pcplusmp ufs md mpt
> ip indmux ptm nfs ]
>
> ::memstat
> Page Summary Pages MB %Tot
> ----
> Kernel 4108442 16048 49%
> Anon 3769634 14725 45%
> Exec and libs 9098 35 0%
> Page cache 29612 115 0%
> Free (cachelist) 99437 388 1%
> Free (freelist) 369040 1441 4%
>
> Total 8385263 32754
> Physical 8176401 31939
>
> Out of 32GB of RAM, 16GB is being used by the kernel. Is there a way to find
> out how much of that kernel memory is due to ZFS?
>
The size of the ARC (cache) is available from kstat in the zfs
module (kstat -m zfs). Neel wrote a nifty tool to track it over
time called arcstat. See
http://www.solarisinternals.com/wiki/index.php/Arcstat
Remember that this is a cache and subject to eviction when
memory pressure grows. The Solaris Internals books have
more details on how the Solaris virtual memory system works
and is recommended reading.
-- richard
> It just seems an excessively high amount of our memory is going to the
> kernel, even with ZFS being used on the server.
>
>
> This message posted from opensolaris.org
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