On Fri, Oct 05, 2001 at 06:05:49PM +0100, Alan Cox wrote:
> > I really like my 7800. At this point I guess I'm going to convert from
> > hard to soft RAID, on the theory that (unfixed) bugs in the firmware are less
> > likely to botch JBOD.
>
> Except for RAID5 the softraid is also likely to outperform a hardware raid
> controller. With RAID5 its a CPU usage tradeoff
Nod. I tested both configurations when I first got the cards, and
RAID0 and RAID10 tests with a dual Athlon and the 3ware 7800 showed Linux
soft-RAID outperforming. I didn't save the hard-RAID results, but the following
is from a private e-mail I sent early in the summer:
RedHat 2.4.5-10smp on dual-Athlon 1.2GHz, 1GB RAM
Soft RAID0 with 4 IBM 41GB 7200RPM ATA-100 drives, chunk size 32K
ext2 w/4K blocks:
Version 1.01c ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
Tyan Thunder 10G 68828 99 138838 75 47756 33 48848 90 116166 61 229.2 1
K7 1.2GHz ------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 1208 100 +++++ +++ 16883 94 1220 100 +++++ +++ 4476 99
I've been using hard-RAID simply because I've been playing with ext3
and LVM, and eliminating MD was one less interaction to worry about until now.
-Bill Rugolsky
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This archive was generated by hypermail 2b29 : Sun Oct 07 2001 - 21:00:38 EST