Date: Wed, 10 Feb 2016 10:15:17 +0000 From: krad <kraduk@gmail.com> To: "Patrick M. Hausen" <hausen@punkt.de> Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: Best practices for ZFS setup for a strictly SSD based system? Message-ID: <CALfReyfD2Div4g-3fK%2B0FeVfb53ndOpr1sCwd2TxPW09G0mEQQ@mail.gmail.com> In-Reply-To: <2D296837-3B06-4E72-B8B0-A33AE6CE48AE@punkt.de> References: <2D296837-3B06-4E72-B8B0-A33AE6CE48AE@punkt.de>
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Dont forget alignment and ashift. You may also want to test compression as well. IF you have spare cpu cycles I would imagine the systems cpu will handle it faster than any onboard ssd compression. Benchmarking would be of use here though. On 9 February 2016 at 15:54, Patrick M. Hausen <hausen@punkt.de> wrote: > Hi, all, > > while there is quite a bit of documentation on how to improve ZFS > performance > by using a combination of rotating disks and SSDs, I have not found much > about > an SSD only setup. > > We are planning to try a hosting server with 8 SATA SSDs with ZFS. Things > I am > not at all sure about: > > * Does the recommended limit of 6 disks for a RAIDZ2 still > hold? 2x 4 disks is quite a bit of overhead, could I use all 8 > in one vdev and get away with it? > (The maximum of 6 recommendation is in some old Sun doc) > > * Will e.g. MySQL still profit from residing on a mirror > instead of a RAIDZ2, even if all disks are SSDs? > > * Does a separate ZIL and/or ARC cache device still > make sense? > > Any pointers or direct help greatly appreciated. Or should I take this to > freebsd-fs@? > > Thanks and best regards, > Patrick > -- > punkt.de GmbH * Kaiserallee 13a * 76133 Karlsruhe > Tel. 0721 9109 0 * Fax 0721 9109 100 > info@punkt.de http://www.punkt.de > Gf: J=C3=BCrgen Egeling AG Mannheim 108285 > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org"
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