[rescue] Ultra 2 upgrade question...
Janet L. Campbell
janet at foonly.com
Mon Apr 4 22:48:36 CDT 2005
On Mon, 4 Apr 2005, Sandwich Maker wrote:
> " From: Phil Stracchino <phil.stracchino at speakeasy.net>
> " Patrick Giagnocavo wrote:
> " > I have had poor results with software RAID and Solaris. Not sure
> " > why... it does work, just slowly.
> " You surprise me. I have eight disks RAIDed with Solstice Disksuite (or
> " whatever Sun's currently calling it) on a single-250MHz U30 running
> " Solaris 9, and it can easily saturate a 100Mbit connection.
> " That is, to be fair, just a stripe, not RAID5.
> apples and oranges. striping - especially across controllers - is a
> great way to improve disk i/o. raid5 requires the metadriver to
> calculate/analyze ecc sums on the fly every time there's an i/o.
> that's the penalty you pay for the ability to pull one of your raid5
> disks out without crashing your system.
...and last I checked (admittedly, Solaris 7), the Solaris metadevice
driver wasn't multithreaded, so you won't get any use of a second CPU.
Kind of sad, really. We had a SS20/812 here that was bottlenecking on a
simple raid0 stripe, and a non-Disksuite solution (writing to separate
disks manually) ended up being far faster. The box had plenty of I/O
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