On Tue, 25 Sep 2007, Ralf Gross wrote:
Bryan J Smith schrieb:
Use multiple cards on multiple PCI-X/PCIe channels, each with
their own RAID-5 (or 6) volume, and then stripe (OS LVM) RAID-0
across the volumes.
The hardware is fixed to one PCI-X FC HBA (4Gb) and two 48x shelfs.
The performance I get with this setup is ok for us. The data will be
stored in bunches of multiple TB. Only few clients will access the
data, maybe 5-10 clients at the same time.
Depending on your network service and application, you can use
either hardware or software for the RAID-5 (or 6).
If it's heavily read-only servicing, then software RAID works great,
because it's essentially RAID-0 (minus 1 disc).
But always use the OS RAID (e.g., LVM stripe) to stripe RAID-0
across all volumes, assuming there is not an OS volume limit
(of course ;).
[...]
I always use SW-RAID for RAID0 and RAID1. But for RAID 5/6 I choose
either external arrays or internal controllers (Areca).
Ralf
Just out of curisosity have you tried SW RAID5 on this array?
Also what do you get if you use RAID0 (hw or sw)?
Justin.
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