Re: mkfs options for a 16x hw raid5 and xfs (mostly large files)

[Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>]

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.