FreeBSD ZFS file server with SSD HDD

krad kraduk at
Mon Nov 6 19:35:29 UTC 2017

you might also find the throughput on that many drives in that
configuration is higher than the single ssd

On 1 November 2017 at 15:23, Warren Block <wblock at> wrote:

> 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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