On Mar 17, 2011, at 19:20 , Joel Maslak wrote: > I'm seeing some differences in SCSI drive numbering in SL 6 / RHEL 6, > compared to CentOS 5 / RHEL 5. This means that on *some* of my servers, > /dev/sdb is actually the first hard disk, which makes kickstarting a bit more > annoying. Does anyone know a way to reverse the order or similar easily?
We're using "pci=bfsort" for SL5 and "pci=bfsort nousb" for SL6 when kickstarting. The "pci=bfsort" is kept on the installed system, "nousb" isn't. Eventually, using /dev/disk/by-* will be the right solution, but for the time being these kernel parameters give us consistent device enumeration across SL5/6. - Stephan > A parameter to grub to either remove the virtual floppy or reorder these > would be handy, if someone knows of one. Certainly I can disable the virtual > floppy in these machines, but I'd rather not do that (it's needed for BIOS > updates). > > In CentOS 5 / RHEL 5, I would see disk configurations such as: > > scsi 0:0:0:0: CD-ROM Virtual CDROM 1.00 PQ: 0 ANSI: 0 > CCS > scsi 1:0:0:0: Direct-Access Virtual Floppy 1.00 PQ: 0 ANSI: 0 > CCS > scsi 2:0:0:0: Direct-Access SEAGATE ST973451SS SM04 PQ: 0 ANSI: 5 > scsi 2:0:1:0: Direct-Access SEAGATE ST973451SS SM04 PQ: 0 ANSI: 5 > scsi 2:1:0:0: Direct-Access Dell VIRTUAL DISK 1028 PQ: 0 ANSI: 5 > s > sd 0:1:0:0: Attached scsi disk sda > sd 2:0:0:0: Attached scsi removable disk sdb > > Basically, sda was the internal RAID 1 disk array and sdb is the DRAC > "virtual floppy". This worked fine, and our scripts knew to expect sda as > the first disk. Note that these are identical systems, purchased at the same > time and delivered together. > > On SL 6 / RHEL 6, it reverses the order of sda and sdb: > > scsi 0:0:0:0: CD-ROM Virtual CDROM 1.00 PQ: 0 ANSI: 0 > CCS > scsi 1:0:0:0: Direct-Access Virtual Floppy 1.00 PQ: 0 ANSI: 0 > CCS > scsi 2:0:0:0: Direct-Access SEAGATE ST973451SS SM04 PQ: 0 ANSI: 5 > scsi 2:0:1:0: Direct-Access SEAGATE ST973451SS SM04 PQ: 0 ANSI: 5 > scsi 2:1:0:0: Direct-Access Dell VIRTUAL DISK 1028 PQ: 0 ANSI: 5 > sd 2:1:0:0: [sdb] Attached SCSI disk > sd 1:0:0:0: [sda] Attached SCSI removable disk > > (sdb becomes 1:0:0:0, sdb becomes 2:0:0:0) -- Stephan Wiesand DESY -DV- Platanenenallee 6 15738 Zeuthen, Germany
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