sata and changing devices

Daniel P. Berrange berrange at redhat.com
Fri May 23 18:34:01 UTC 2008


On Fri, May 23, 2008 at 01:41:32PM -0400, Gerry Reno wrote:
> We have a new machine which has SATA.  This is the first machine we have 
> had with SATA.  SATA and these changing device locations are giving me a 
> headache.  None of our disk device tools work with SATA.  For instance 
> we have a tool that will save all the MBR's and partition tables off to 
> files such as 'hda.mbr' and 'hda.part'.  With SATA this does not work 
> because what was 'sda' during this boot may be 'sdc' on the next boot.  
> So I need to find out if there is some best practice guide for how to 
> rewrite our tools so that they can support SATA.  We use LVM over RAID 
> on all our drives and all our RAID and LVM tools appear to still work.  
> It is only when dealing with the low-level disk devices themselves that 
> we have problems.  Can someone give me some suggestions as to how to 
> manage things when using SATA?

If you want stable device names, don't use /dev/sd*  at all.

This is what /dev/disk/by-{id,label,path,uuid}/*  are for

Dan.
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