good performing SCSI RAID5 ( was: asr ( 2015S ) support in 5.4 amd64? )

[Steven Hartland]

----- Original Message ----- 
From: "Dan Nelson" <dnelson at allantgroup.com>

> The faster rpms will get you more concurrent I/Os per second but won't
> do as much for throughput.  My asr 3200S cards got repurposed before I
> could try them with 5.x, but with the 370F firmware I'm pretty sure I
> was able to get more than 40MB/sec reads out of them on 4.x with 4-disk
> RAID5 sets.  Since the asr driver needs Giant, try a UP kernel and see
> if it goes any faster.

Stated max seq read on the drives ( Maxtor 10k IV's ) is 89MB/s
where as the Seagate SATA's its 65MB/s so its a noticeable difference.
For the RAID to only give 27->33MB/s ( still testing stripe sizes ) is
disappointing to say the least, especially considering I have the SATA
RAID giving me 200MB/s.

    Steve


================================================
This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. 

In the event of misdirection, illegible or incomplete transmission please telephone (023) 8024 3137
or return the E.mail to postmaster at multiplay.co.uk.