On Feb 26, 2010, at 5:46 AM, Ronny Egner wrote: > Dear All, > > our storage system running opensolaris b133 + ZFS has a lot of memory for > caching. 72 GB total. While testing we observed free memory never falls below > 11 GB. > > Even if we create a ram disk free memory drops below 11 GB but will be 11 GB > shortly after (i assume ARC cache is shrunken in this context). > > As far as i know ZFS is designed to use all memory except 1 GB for caching....
In arcstat (or kstats for arc) the "c" value is the target value for "arcsz" which is the current size. http://www.solarisinternals.com/wiki/index.php/Arcstat You can track this over time to see how it reacts. However, if there is a decrease in "c," the cause is not seen from the ZFS perspective and you will need to look for other sources of memory demand. -- richard ZFS storage and performance consulting at http://www.RichardElling.com ZFS training on deduplication, NexentaStor, and NAS performance http://nexenta-atlanta.eventbrite.com (March 16-18, 2010) _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
