Date: Fri, 30 May 2014 17:45:50 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: freebsd-questions@freebsd.org Subject: Re: ZFS Recommendations for a new server Message-ID: <5388B5BE.6050609@infracaninophile.co.uk> In-Reply-To: <CAHieY7Ros7sXaOpWdR7E0fZvT_m%2Bz%2Bj79CaE8szxvBEyJeHhFg@mail.gmail.com> References: <CAHieY7Ros7sXaOpWdR7E0fZvT_m%2Bz%2Bj79CaE8szxvBEyJeHhFg@mail.gmail.com>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --8JgAd04FCwJ3toLCshphPVRHpgvnwnWox Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 05/30/14 16:11, Alejandro Imass wrote: > The new server has a 2 x 1TB RE4 3ware 9650SE RAID and I have friends t= hat > tell me is actually better to use ZFS RAID instead of HW RAID1. Is this= > true? Why so? I recently had a similar setup using an old 3ware RAID card, which we upgraded to 4TB drives .... and then had to ditch the 3ware card and replace it with a LSI HBA because the 3ware card didn't recognise anything beyond the first 2TB or the drives. Yes, you want to use ZFS RAID rather than putting ZFS onto a single virtual drive presented by your RAID controller. ZFS does all the resilience and patrol read^W^Wzpool scrubbing and disk IO caching and stuff using your system's main RAM and CPUs which are generally a lot more capable than any RAID controller. Plus ZFS does it better -- 'punctured stripe' is not something that happens to ZFS for instance. Even though 3ware does have a 'pass through' mode -- which is what you'ld want with ZFS, the RAID controller still gets in the way to some extent. Just using a plain and simple HBA gives much better performance.= Cheers, Matthew --8JgAd04FCwJ3toLCshphPVRHpgvnwnWox Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (FreeBSD) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQJ8BAEBCgBmBQJTiLXFXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXQxOUYxNTRFQ0JGMTEyRTUwNTQ0RTNGMzAw MDUxM0YxMEUwQTlFNEU3AAoJEABRPxDgqeTn3m0P+wWB/xiVjZATmbSMmW/Jo7a4 6zpBoRghmrM6jg41fGTawFTRe9jo/K3FCDFodjg+Lh3HG18sR/MtXJP6hg6ytt97 yH2gBZniF+TsPS9h3cH6cUffJA8zyR+erp0a4sAJO5GS/lzBhqHf6/FC219noBEn KtHdF+OOt4ky4nHcYlpuwE6bkyDBNJk4qgUDz1Gg3I0Ic8oOw0CLL33XG7Qb8Sqj Ugvv5EA/U2HX1T462GcMknXqyJP2Tg4NBe5HpyDpdnucBL44mvKwXjuwhMClN5lO dLxGHlQY497QBqC3gpDqV62nm6naS3G2yJz1GcvCdPWFR/BAsuk4TH/JezfN4r8l h53bGaH4YLJNy0ynGoqIG16mwP2JOKFuBtyghdACo6kE/Flm5KzPk1bmCXRF++ra L95Rz7/P/IW9tBUjYd7RbLX4CogUPTmZKoGnB76SXds4Atex6ys2pfGQnTy7ECV5 pWg61xHDZ9BHUb+enaEzVhCD5NmIpNQq8sCC4iuLtZ+n/PluOqQ5+S9B+gHOwOsJ d9dM6AOjYKwZFv0mqCGPsO5x0uRjhS74HSqzIL802mfJZVB09FpVHKVDI786U524 qTNBWNlYzm+Y7/O1KkQ6GHKRB2m62B/5/0/S3ByiE+j7IPus1/1zsUzdHnNEQ3sm fkL/7ACG2wK1oIfDFbno =OEQ3 -----END PGP SIGNATURE----- --8JgAd04FCwJ3toLCshphPVRHpgvnwnWox--
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