LSI tech support is very helpful. 800-633-4545 in the usofa. Or:
http://www.lsi.com/support/support_form.html

Gaby Vanhegan wrote:
quoted text
> We had a drive failure on a RAID5 (LSI MegaRaid SATA 150-4) volume in 
> our server (OpenBSD 4.1/x86).  The hot spare kicked in and the volume 
> rebuilt fine after a successful fsck in single user mode.  We put in a 
> new drive as the new hot spare:
>
> # bioctl -Div ami0
> bioctl: cookie = 0xd2a23c10
> bio_inq
> bio_inq { 0xd2a23c10, ami0, 2, 4 }
> Volume  Status               Size Device
>  ami0 0 Online       501991079936 sd0     RAID5
>       0 Online       250995539968 0:0.0   noencl <Maxtor  
> 6V250F0         VA11>
>                                                  'V594LE9G'
>       1 Online       250995539968 0:1.0   noencl <Maxtor  
> 6V250F0         VA11>
>                                                  'V5075JVG'
>       2 Online       250995539968 0:3.0   noencl <Maxtor  
> 6V250F0         VA11>
>                                                  'V5064EEG'
>  ami0 1 Hot spare    250053918720 0:2.0   noencl <WDC     
> WD2500AAKS-00VSA01.0>
>                                                  '     WD-WMART1158126'
> #
>
> The thing is the hot spare is fractionally smaller than the other 
> drives, which is what happens when you go into a shop and ask for a 
> 250G drive.  What's going to happen if another drive fails and the 
> RAID array tries to rebuild onto the slightly smaller hot spare?  Will 
> it explode or just error out?  Do we need to go back and put a 
> slightly larger drive in?
>
> I know this isn't the ideal place to ask the question but I figure we 
> can't be the only people running LSI cards under OpenBSD.  So far I 
> can't find any good references on the 'net but my logic and intuition 
> tells me that the drive needs to be bigger...
>
> G.
>
> -- 
> Being drunk is feeling sophisticated without being able to say it.
> http://www.playr.co.uk/