I think you may have a point. I'm also inclined to enable prefetch caching per Saso's comment, since I don't have massive throughput - latency is more important to me.
-----Original Message----- From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-boun...@opensolaris.org] On Behalf Of James H Sent: Tuesday, September 11, 2012 5:09 AM To: zfs-discuss@opensolaris.org Subject: Re: [zfs-discuss] Interesting question about L2ARC Dan, If you're not already familiar with it, I find the following command useful. It shows the realtime total read commands, number hitting/missing ARC, number hitting missing L2ARC, breakdown of MRU/MFU etc. arcstat_v2.pl -f read,hits,mru,mfu,miss,hit%,l2read,l2hits,l2miss,l2hit%,arcsz,l2size,mrug,mf ug 1 That version of Arcstat is from http://github.com/mharsch/arcstat For comparison, I've got about 650GB of VMs on each of my two Nexenta VSAs (16GB/240GB L2ARC). When it's just ticking over at 50-1000r/s then 99% of that is going to ARC but I'm also seeing patches where it goes 2-5k reads and I'm seeing 20-80% l2arc hits. These have been running for about a week and, given my understanding of how L2ARC fills, I'd suggest maybe leaving it to warm up longer (e.g. 1-2 weeks?) caveat: I'm a complete newbie to zfs so I could be completely wrong ;) Cheers, James _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
