Date: Wed, 5 Nov 2014 08:53:42 +0000 From: =?utf-8?B?S2FybGkgU2rDtmJlcmc=?= <Karli.Sjoberg@slu.se> To: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: Differences in memory handling on systems with/out cache drives Message-ID: <5F9E965F5A80BC468BE5F40576769F099DF87FBB@exchange2-1> In-Reply-To: <5F9E965F5A80BC468BE5F40576769F099DF87F57@exchange2-1> References: <5F9E965F5A80BC468BE5F40576769F099DF87F57@exchange2-1>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wed, 2014-11-05 at 08:44 +0000, Karli Sjöberg wrote: > Hey all! > > Still investigating the intermittent lockups we are experiencing on our > storage systems and have started to compare memory graphs from our > Graphite monitoring system. What´s interesting about two of our systems > is that they both have the same amount of RAM; 32 GB. But on one of > them, I have "zpool remove"'d the cache drives from the pool and have > been able to study how different their memory graphs now look like. > > Also worth noting is that the cache-less system nearly haven´t swapped > at all (1112K) since the last stall 20 days ago, while the other system > has swapped 78 MB during it´s 48 days of uptime. > > I´ve attached both screenshots from the two systems, with- and without > cache drives, displaying a period of 12 hours. > > What´s most notable are the characteristic cuts that happen on the > cache-less system when ZFS goes in and evicts blocks from ARC that shows > as a decrease in "wired" and increase in "free", that just doesn´t > happen/looks different in the system with cache drive configured in the > pool. > > What´s your take on this? Are we hitting bug: 187594 perhaps? How can we > know? > > > -- > > Med Vänliga Hälsningar > > ------------------------------------------------------------------------------- > Karli Sjöberg > Swedish University of Agricultural Sciences Box 7079 (Visiting Address > Kronåsvägen 8) > S-750 07 Uppsala, Sweden > Phone: +46-(0)18-67 15 66 > karli.sjoberg@slu.se > _______________________________________________ > freebsd-fs@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" Damnit, the images attached disappeared, here are weblinks for them instead: with-l2arc: http://i.imgur.com/ouNFOvc.png without-l2arc: http://i.imgur.com/0pBkyOS.png Sorry about that. -- Med Vänliga Hälsningar ------------------------------------------------------------------------------- Karli Sjöberg Swedish University of Agricultural Sciences Box 7079 (Visiting Address Kronåsvägen 8) S-750 07 Uppsala, Sweden Phone: +46-(0)18-67 15 66 karli.sjoberg@slu.se
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?5F9E965F5A80BC468BE5F40576769F099DF87FBB>