Messages in this thread |  | | Date | Fri, 5 Oct 2001 14:22:15 -0400 | From | "Bill Rugolsky Jr." <> | Subject | Re: 3ware discontinuing the Escalade Series |
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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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