3ware RAID1 sequential read speed slower than write speed (2.4.8-ac10)

From: Yusuf Goolamabbas (yusufg@outblaze.com)
Date: Fri Aug 24 2001 - 04:06:55 EST

Next message: Anwar P: "What version of the kernel fixes these VM issues?"
Previous message: Paal Chr Birkeland: "Re: Determining maximum partition size on a hard disk"
Next in thread: David Rees: "Re: 3ware RAID1 sequential read speed slower than write speed (2.4.8-ac10)"
Reply: David Rees: "Re: 3ware RAID1 sequential read speed slower than write speed (2.4.8-ac10)"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

P3-450 with 256MB RAM with a 3ware 6200 attached to 2 20GB Western
Digitial 7200RPM Caviar Drive WD200BB

Running bonnie++ <http://www.coker.com.au/bonnie++/> on both an ext3
and ext2 partition, I get the following results

Version 1.01d ------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
ext3 512M 6020 98 41022 57 6673 8 4619 77 21834 14 237.1 2

Version 1.01d ------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
ext2 512M 6385 99 39969 32 9371 10 5540 91 27864 14 320.7 2

Whilst, I think the write performance is quite good. The read
performance seems to be quite bad. I expected read performance to be
better than write performance for RAID-1 configuration

Any ideas,patches to try ?

Regards, Yusuf

-- 
Yusuf Goolamabbas
yusufg@outblaze.com
-
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/

Next message: Anwar P: "What version of the kernel fixes these VM issues?"
Previous message: Paal Chr Birkeland: "Re: Determining maximum partition size on a hard disk"
Next in thread: David Rees: "Re: 3ware RAID1 sequential read speed slower than write speed (2.4.8-ac10)"
Reply: David Rees: "Re: 3ware RAID1 sequential read speed slower than write speed (2.4.8-ac10)"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

This archive was generated by hypermail 2b29 : Fri Aug 31 2001 - 21:00:08 EST