Re: 3ware and scsi ids

[Friedrich Lobenstock <fl@fl.priv.at>]

Deas, Jim wrote:
> I am currently using 3wares products to create 2T raids.
> To increase performance on my NAS type boxes I am
> using software raids.
>  My problem relates to a falure of a IDE drive.
> Once a drive fails the next boot of the machine remaps all scsi ids.
> so /dev/sda-adi becomes /dev/sda-sdh.
> In short, if /dev/sdb dies, all raids become bad as all scsi ids
> shift down making my raidtab file now point at the wrong drives.
> (I assume this will also be a possible problem when I use
> my USB dongle to update software.)
> 
>  Is there a way to hard assign logical /dev/sd(x) in the driver
> so they will always map the same ide port on the 3ware controllers?
> 3ware is no help on this. They say it is the bios/system and they
> have no control over this.

You'd better use mdadm instead of the raidtools.

The config file for mdadm looks like this:
# cat /etc/mdadm.conf
DEVICE /dev/hd* /dev/sd*
ARRAY /dev/md0 level=raid1 num-devices=2 UUID=52094036:b2e9cf8b:4267c923:750757da

So you do not have to worry about which drive gets assigned which
scsi id.

A
    /sbin/mdadm --assemble --scan
will do the trick.

Get it at http://www.cse.unsw.edu.au/~neilb/source/mdadm/

-- 
MfG / Regards
Friedrich Lobenstock
____________________________________________________________________
Friedrich Lobenstock                       Linux Services Lobenstock
URL: http://www.lsl.at/                         Email: fl@fl.priv.at
____________________________________________________________________