topic Re: Poor performance msa1000 in MSA Storage

Poor performance msa1000

Gregory Beterams — Mon, 02 Oct 2006 03:39:16 GMT

Hi,
I have slow write performance with a msa1000.
Set up: Linux server (2 opteron 280, 8gb ram), Redhat Enterprise 4 x64, the dual hba (from hp, recommended for linux, forgot the part number) connected directly to the msa1000.
The msa1000 has 14 disk of 300gb 15k. One raw device with 2 raid 5 as it's not possible to make one (2tb limit). The controller on the msa1000 has 512mb cache, linux profile selected.
Drivers frome the hba was installed from the HP's rpm .
Any idea why there is a limit of around 55 MB/S?
Regards

Re: Poor performance msa1000

James Muell — Tue, 03 Oct 2006 08:58:12 GMT

Well for one the MSA controller is only rated at 160mbs and its a single active channel transfering data. In our testing the MSA has never been high performance device.

Re: Poor performance msa1000

Uwe Zessin — Tue, 03 Oct 2006 12:34:14 GMT

> its a single active channel transfering data.

The base unit has two SCSI busses (bay 1..7 and bay 8..14).