Date: Wed, 1 Nov 2017 09:23:44 -0600 (MDT) From: Warren Block <wblock@wonkity.com> To: Kate Dawson <k4t@3msg.es> Cc: freebsd-questions@freebsd.org Subject: Re: FreeBSD ZFS file server with SSD HDD Message-ID: <alpine.BSF.2.21.1711010918350.68353@wonkity.com> In-Reply-To: <20171011130512.GE24374@apple.rat.burntout.org> References: <20171011130512.GE24374@apple.rat.burntout.org>
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On Wed, 11 Oct 2017, Kate Dawson wrote: > Hi, > > Currently running a FreeBSD NFS server with a zpool comprising > > 12 x 1TB hard disk drives are arranged as pairs of mirrors in a strip set ( RAID 10 ) > > An additional 2x 960GB SSD added. These two SSD are partitioned with a > small partition begin used for a ZIL log, and larger partion arranged for > L2ARC cache. For FreeNAS, we recommend against using sharing an SSD like this. In fact, we recommend against using one SSD for anything more than a single SLOG for a single pool. To be effective, this needs to be a low-latency SSD, and I/O contention with other shared partitions on the same device can negate the performance benefit.
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