NVRAM disk aliases
27 October 2009

I inherited a T2000 which was configured to use hardware RAID. I know that’s Sun best practice, but I wanted to go back to two disks so I could split the mirror for LiveUpgrades. (This was back before ZFS root.)

To get rid of the hardware mirroring:

# raidctl -d c1t0d0

Then I set the follwing boot paths. I always use disk0 and disk1 as my disk names. That’s logical, isn’t it?

ok setenv use-nvramrc? true
ok nvedit
 0: devalias disk0 /pci@7c0/pci@0/pci@1/pci@0,2/LSILogic,sas@2/disk@0,0
 1: devalias disk1 /pci@7c0/pci@0/pci@1/pci@0,2/LSILogic,sas@2/disk@1,0
 2: <ctrl-c>
ok nvstore
ok setenv boot-device disk0 disk1 net

While we’re at it, here are the boot paths for the other machines I’ve been working on. Could save a bit of faffing around one day.

This is for a v245.

ok nvedit
   0: nvalias disk0 /pci@1e,600000/pci@0/pci@a/pci@0/pci@8/scsi@1/disk@0,0:a
   1: nvalias disk1 /pci@1e,600000/pci@0/pci@a/pci@0/pci@8/scsi@1/disk@1,0:a
   2: <ctrl-c>

And this is for the old-school classic v210.

ok nvedit
 0: devalias disk0 /pci@1c,600000/scsi@2/disk@0,0
 1: devalias disk1 /pci@1c,600000/scsi@2/disk@1,0
 2: <ctrl-c>

This is for the mighty Ultra 2. I still have a couple of these kicking about.

ok nvedit
   0: devalias disk0 /sbus/SUNW,fas@e,8800000/sd@0,0
   1: devalias disk1 /sbus/SUNW,fas@e,8800000/sd@1,0
   2: <ctrl-c>

Can’t imagine I’ll ever want this again, but here are the disk paths for the hated v100.

ok nvedit
 0: devalias disk0 /pci@1f,0/ide@d/disk@0,0
 1: devalias disk1 /pci@1f,0/ide@d/disk@2,0
 2: <ctrl-c>

Remember, when you’ve set your DiskSuite disk mirroring, to pop

set md:mirrored_root_flag = 1

into /etc/system so the thing will boot if it completely loses a disk.

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