Date: Sat, 09 Jan 2010 12:32:04 +1100 From: Andrew Snow <andrew@modulus.org> To: freebsd-stable@freebsd.org Subject: Re: ZFS performance degradation over time Message-ID: <4B47DC94.7020202@modulus.org> In-Reply-To: <hi8kbh$fj2$1@ger.gmane.org> References: <7346c5c61001030842r7dc76199y51e4c1c90a3eea6e@mail.gmail.com> <hi2nsf$do5$1@ger.gmane.org> <7346c5c61001080831w375d158fu5b1996ee58cb0f8d@mail.gmail.com> <hi8kbh$fj2$1@ger.gmane.org>
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Ivan Voras wrote: > It is true that ZFS in theory doesn't do very well with random writes of > any kind - the kind that torrent clients do should actually be the worst > case for ZFS, *but*, this very much depends on the actual workload. ZFS has aggressive read-ahead for sequential read-aheads, so its worth noting that the performance problem can be mitigated by having lots of RAM free for read-ahead, as well as multiple vdevs in the zpool (so that it can be seeking all disks at once) - Andrew
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