On Mon, Apr 14, 2008 at 11:34 PM, Will Murnane <[EMAIL PROTECTED]> wrote:
> On Tue, Apr 15, 2008 at 1:25 AM, Bob Friesenhahn > <[EMAIL PROTECTED]> wrote: > > For obvious reasons (redundancy and throughput), it makes more sense > > to purchase two 12 port cards. I see that there is an option to > > populate more cache RAM. > More RAM always helps ;) > > > I would be interested to know what actual throughput that one card is > > capable of. The CDW site says "300MB/s". > It looks like it's more like 600 MB/s. See this thread on Hardforums: > http://hardforum.com/showpost.php?p=1032222973&postcount=111 > for more details. He's got a 1280ML and 24 disks with 22 in raid 6 > and 2 hot spares, getting up to 588 MB/s sustained block read > according to HDTach. > > Two other people on that forum (handles Ockie and odditory) have those > cards, and are similarly impressed, but I don't see benchmarks from > them. In any case, I agree with your suggestion: get two 12-port > cards, or three 8-port cards, and save money and get better > performance anyways. > > Will > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss > I'm sure you're already aware, but if not, 22 drives in a raid-6 is absolutely SUICIDE when using SATA disks. 12 disks is the upper end of what you want even with raid-6. The odds of you losing data in a 22 disk raid-6 is far too great to be worth it if you care about your data. /rant
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