Date: Sun, 26 May 2002 23:00:50 -0600 From: "Kenneth D. Merry" <ken@kdm.org> To: Phil Rosenthal <winter@villaweb.net> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: Hardware RAID vs vinum Message-ID: <20020526230050.A8026@panzer.kdm.org> In-Reply-To: <004701c20530$68e98a20$0700a8c0@zoom>; from winter@villaweb.net on Sun, May 26, 2002 at 11:41:39PM -0400 References: <004701c20530$68e98a20$0700a8c0@zoom>
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On Sun, May 26, 2002 at 23:41:39 -0400, Phil Rosenthal wrote: > I've been using vinum for about a year now, and have been using it on some > pretty large, heavily accessed RAID5 file system (500GB & 70MBits/sec > constantly ). > Is there any reason why a hardware raid would be better, am I missing out on > anything? As someone else mentioned, CPU utilization, and possibly features, depending on the RAID card. > What hardware RAID cards are best under FreeBSD 4.6? I would recommend an Adaptec 5400S. It has a hardware parity engine to accelerate RAID-5 parity calculations, so writes will be faster than on a RAID card without a parity engine. On the read side, I've seen one of those cards pump out 175MBytes/sec. (under NT, the guy doing the test didn't have FreeBSD installed), and I think the benchmarks claim it can do up to 190MB/sec on reads. (From looking at the benchmark web page, it looks like they only got 160MB/sec, but since I've seen it go faster I think that's a tad low.) Writes are obviously slower, but the parity engine helps speed things up. The card also does well with high transaction loads. (disclaimer: I work for Adaptec) Ken -- Kenneth Merry ken@kdm.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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