Date: Tue, 18 Feb 2014 20:28:04 -0500 From: Eitan Adler <eadler@freebsd.org> To: freebsd@fongaboo.com Cc: questions@freebsd.org Subject: Re: ZFS on Hardware RAID controller Message-ID: <CAF6rxgkVWm9AbM8SWCA3oHg8DHwSrRbSTW%2Ba%2BE9o%2Bky9SKNc2w@mail.gmail.com> In-Reply-To: <alpine.BSF.2.00.1402181717580.4903@helix.wtfayla.net> References: <alpine.BSF.2.00.1402111550250.5347@helix.wtfayla.net> <CAF6rxgku91Rz037H-rpBCzc9G5bu5=KOiAm1Wms3%2B1Xcz%2BJjtQ@mail.gmail.com> <alpine.BSF.2.00.1402181717580.4903@helix.wtfayla.net>
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On Tue, Feb 18, 2014 at 5:27 PM, <freebsd@fongaboo.com> wrote: > > When we spoke, you noted that when installing ZFS on multiple disks > connected to a hardware RAID controller, it is best to config it to JBOD. There are a few reasons for this. (a) Hardware RAID serves as a single point of failure: if the contoller dies you have neither disk (b) As Andrew noted , using hardware RAID means that ZFS won't be able to tell which disk is which. The ZFS management tools won't work as expected (they will show only one disk). (c) Since ZFS implements RAID itself it can use knowledge about the physical disks for better performance Also see: https://en.wikipedia.org/wiki/ZFS#ZFS_and_hardware_RAID > I tried to explain this to a colleague, but they were skeptical. Would you > (or anyone) be willing to give me a one or two line sales-pitch on "ZFS does RAID better than the controller." > why one > should abandon traditional notions of RAID performance in favor of allowing > ZFS to do disk management? The goal isn't to give up on RAID but move its implementation to ZFS. -- Eitan Adler Source, Ports, Doc committer Bugmeister, Ports Security teams
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