Re: building a new fileserver

On Thu, Jan 18, 2007 at 09:51:56PM -0500, W. Josephson wrote:
> I'd like to solicit people's opinions about configuring
> CURRENT for a new fileserver that we'll be using internally.
> I have only recently had hardware available for running anything
> other than 6-STABLE so:
> 
> 	1.	We'd like to use the 16-port 3Ware 9650SE-16.
> 	Does anyone here have experience with this card in
> 	RAID-6 mode under FreeBSD?
> 
>         2.      Any one have advice for setting up UFS+gjournal?
>         I've been using FFS+SU for some time on a number of machines
>         with filesystems up to about 1TB, but I'm not looking forward
>         to fsck, even background fsck, on multiple 10TB filesystems.
> 	Does anyone here have experience with UFS+gjournal on large
>         filesystems?  Are there any gotchas to be aware of when
>         configuring?  Can someone describe briefly what guarantees
>         UFS+gjournal makes?

One gotcha with gjournal is that there is apparently still at least
one pretty obscure data corruption bug lurking.  I see this when doing
concurrent package builds on a 12 cpu system with a single gjournal
data store, although I haven't run this configuration for a few
months.

Kris