Hideous writes on LSI 150-4 RAID1?

[growse]

Just created a 300Gb RAID1 array with 2 disks on an LSI 150-4 SATA controller, with adaptive read-ahead and write-thru policies set, and I'm copying about 55 Gb of data onto it. Thing is, it's being really really slow, and the LSI performance monitor is reading about 1MB/s so windows thinks it's going to take about 5 hours to transfer 55Gb of data.

Any reason why the writes are so slow? I'm fairly sure they're not meant to be on RAID1.......

*edit: just did some iometer tests on this - using 32KB sizes, on completely non-random transfers, my windows software RAID-0 array of 2 15k SCSI disks gives about 130MB/s reads, and 68MB/s writes and the LSI RAID-1 SATA array of 2 Maxtor 300Gb Maxline 3's gives 80MB/s reads (pretty good) and 2.34MB/s writes (shocking).

HELP!

 

[leezer3]

Well, I take it you know that RAID 1 is a mirror- The data is being written twice, but 1mb/s is still just a little slow
Updated to the latest controller BIOS/ drivers?
Also, try turning off the cache mode & see what this does for you. (Buggy controller?)

Oh, you're not copying the 55gb from anywhere silly are you? (A networked drive is likely to be slower, but again not that slow)

-Leezer-

 

[growse]

The data is coming off the RAID-0 array, so no problems there. I'm not expecting stellar performance, but the anything approaching 50-60% of the read value would be nice.

I've not tried changing the drivers/BIOS - I'll check what version I've got and what the latest is and see how far behind I am...

 

[growse]

Right, I've got the latest drivers, and I'm a few letters of the firmware version, but I don't necessarily want to go through the faff of changing that if it's something else...