Date: Mon, 21 Jan 2019 15:12:56 +0100 From: Borja Marcos <borjam@sarenet.es> To: Maciej Jan Broniarz <gausus@gausus.net> Cc: andy thomas <andy@time-domain.co.uk>, freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: ZFS on Hardware RAID Message-ID: <A4C7E74F-B602-414A-9B9D-F012F53BB025@sarenet.es> In-Reply-To: <1691666278.63816.1547976245836.JavaMail.zimbra@gausus.net> References: <1180280695.63420.1547910313494.JavaMail.zimbra@gausus.net> <92646202.63422.1547910433715.JavaMail.zimbra@gausus.net> <CAOeNLurgn-ep1e=Lq9kgxXK%2By5xqq4ULnudKZAbye59Ys7q96Q@mail.gmail.com> <alpine.BSF.2.21.1901200834470.12592@mail0.time-domain.co.uk> <1691666278.63816.1547976245836.JavaMail.zimbra@gausus.net>
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> On 20 Jan 2019, at 10:24, Maciej Jan Broniarz <gausus@gausus.net> = wrote: >=20 > Hi, >=20 > I am thinking about the scenario with ZFS on single disks configured = to RAID0 by hw raid. > Please correct me, if i'm wrong, but HW Raid uses a dedicated unit to = process all RAID related work (eg. parity checks). > With ZFS the job is done by CPU. How significant is the performance = loss in that particular case? Modern CPUs are supercomputers. ZFS performs amazingly well even with = the puny CPUs found in some small computers like the HP MIcroservers. And there is another advantage with ZFS running on the main processor: = end to end error detection and recovery, especially if you are using ECC memory. Borja.
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