On Tuesday 08 June 2004 19:14, Ronny Buchmann wrote: > On Monday 07 June 2004 01:57, Jack Howarth wrote: > > I have a dual Xeon box setup using a Tyan Tigert i7505 motherboard > > with two identical SATA hard drives set in a software RAID 1 off of > > the Promise SATA connections. As this box is intended a prototype for > > replacing our SGIs with, I want to attach an old SCSI-1 magnetic > > optical drive to this machine. However I am rather concerned about > > the finer points of competition for the sd* devicenames. In particular > > since my SATA RAID 1 appears as md devices based of out Software > > RAIDs of SATA drives on sda and sdb, what will happen if I add > > a SCSI card and attach a magnetic optical. Under IRIX, the fact that > > each SCSI bus had its own identifier in the devicename would > > prevent this issue. Under Linux however, I am very unclear on how > > one prevents the sd* device namespace from getting muddled. That is > > how can I be certain that the SATA drives will always retain > > ownership of the sda and sdb device names? > > Devices are named in order of appearance. > But linux software raid uses autodetection of raid members (by looking at > the superblock), so even if your drives will be renamed from sda to sdb and > sdb to sdc it shouldn't harm you in any way. You need to have partitions on the disks, raid autodetection doesn't work when raid members are whole disks (without partitions). (At least the last time I tried.) -- http://LinuxWiki.org/RonnyBuchmann
