Date: Tue, 9 Feb 2016 16:54:36 +0100 From: "Patrick M. Hausen" <hausen@punkt.de> To: freebsd-stable <freebsd-stable@freebsd.org> Subject: Best practices for ZFS setup for a strictly SSD based system? Message-ID: <2D296837-3B06-4E72-B8B0-A33AE6CE48AE@punkt.de>
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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 --=20 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
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