[zfs-discuss] Fwd: l2arc fully aggressive settings?
dajhorn at vanadac.com
Tue Sep 15 10:50:02 EDT 2015
On Tue, Sep 15, 2015 at 2:28 AM, Håkan Johansson
<zfs-discuss at list.zfsonlinux.org> wrote:
> I am trying to use ZFS as a replacement for a low-latency file system
> built with MD mirror raid of SSD and (a few) HDDs for resiliency. By
> using the MD option write-mostly for the HDDs, all reads are served
> by the SSD with low latency and high bandwidth.
> (As long as the SSD is alive :) )
> I have not been able to find an option to tell a ZFS mirrored pool to
> serve all reads by some specific disks (the SSDs). Is there one?
> (Such an option would be very nice.)
The issue tracker has some technical discussion about optimizing
mirrors that have asymmetric performance. Start at
and click into the related issues and enhancement proposals.
I recall that the feature you probably want wasn't added to ZoL
because it had side-effects. OpenZFS is working on an alternative
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