Date: Fri, 4 Oct 2013 02:50:23 -0700 (PDT) From: Beeblebrox <zaphod@berentweb.com> To: freebsd-fs@freebsd.org Subject: Questions re swap-on-zfs Message-ID: <1380880223590-5848720.post@n5.nabble.com>
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I have 2 swap devices on my system. #1-tank0/swap on ZFS, #2-/dev/ada0p1 on SSD 1GB. I have some questions for swap-on-zfs: 1. I had read in the past that swap-on-zfs can cause instability if memory gets used to full capacity. Is this still the case, or has that issue been corrected? The reason I created swap-#2 is precisely for this purpose; a small backup resource. 2. If the problem still persists, I would like to tweak the setup so that swap-#2 is only used as last resort. I tried setting the priority (pri) in fstab, but it does not seem to work - how can this be done? /dev/ada0p1 none swap sw,pri=0 0 0 tank0/swap none zfs sw,pri=9 0 0 3. Is it necessary for the data on swap to go through the Intent Log? I have a separate ZIL device for tank0 pool. What risk is there if I disable the log for the swap dataset? Is this done by modifying the "primarycache" parameter for dataset? 4. Any other ideas to speed-up swap performance on tank0/swap? Regards. -- View this message in context: http://freebsd.1045724.n5.nabble.com/Questions-re-swap-on-zfs-tp5848720.html Sent from the freebsd-fs mailing list archive at Nabble.com.
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