More LUNs than letters...

[Sandor W. Sklar]

On Oct 16, 2007, at 12:57 PM, Arpotu wrote:

> Question - I'm just about to add a bunch of new SAN LUNs to a RHEL  
> AS 4
> server, and was curious how it would handle device numbering above
> /dev/sdz... does it use /dev/sdaa.../dev/sdzz or something?

yup!

$ dmesg | grep Attached
Attached scsi disk sda at scsi0, channel 0, id 2, lun 0
Attached scsi disk sdb at scsi1, channel 0, id 2, lun 3
Attached scsi disk sdc at scsi1, channel 0, id 2, lun 6
Attached scsi disk sdd at scsi1, channel 0, id 2, lun 7
Attached scsi disk sde at scsi1, channel 0, id 2, lun 10
Attached scsi disk sdf at scsi1, channel 0, id 2, lun 11
Attached scsi disk sdg at scsi1, channel 0, id 2, lun 12
Attached scsi disk sdh at scsi1, channel 0, id 2, lun 13
Attached scsi disk sdi at scsi1, channel 0, id 2, lun 14
Attached scsi disk sdj at scsi1, channel 0, id 2, lun 24
Attached scsi disk sdk at scsi1, channel 0, id 4, lun 2
Attached scsi disk sdl at scsi1, channel 0, id 4, lun 4
Attached scsi disk sdm at scsi1, channel 0, id 4, lun 5
Attached scsi disk sdn at scsi1, channel 0, id 4, lun 8
Attached scsi disk sdo at scsi1, channel 0, id 4, lun 9
Attached scsi disk sdp at scsi1, channel 0, id 5, lun 32
Attached scsi disk sdq at scsi1, channel 0, id 5, lun 34
Attached scsi disk sdr at scsi1, channel 0, id 5, lun 35
Attached scsi disk sds at scsi1, channel 0, id 5, lun 36
Attached scsi disk sdt at scsi1, channel 0, id 5, lun 37
Attached scsi disk sdu at scsi1, channel 0, id 5, lun 39
Attached scsi disk sdv at scsi1, channel 0, id 5, lun 40
Attached scsi disk sdw at scsi1, channel 0, id 5, lun 41
Attached scsi disk sdx at scsi1, channel 0, id 5, lun 42
Attached scsi disk sdy at scsi1, channel 0, id 5, lun 43
Attached scsi disk sdz at scsi1, channel 0, id 5, lun 44
Attached scsi disk sdaa at scsi1, channel 0, id 5, lun 51
Attached scsi disk sdab at scsi1, channel 0, id 5, lun 52
Attached scsi disk sdac at scsi1, channel 0, id 5, lun 53
Attached scsi disk sdad at scsi1, channel 0, id 5, lun 54
Attached scsi disk sdae at scsi1, channel 0, id 7, lun 33
Attached scsi disk sdaf at scsi1, channel 0, id 7, lun 38
Attached scsi disk sdag at scsi1, channel 0, id 7, lun 45
Attached scsi disk sdah at scsi1, channel 0, id 7, lun 46
Attached scsi disk sdai at scsi1, channel 0, id 7, lun 47
Attached scsi disk sdaj at scsi1, channel 0, id 7, lun 48
Attached scsi disk sdak at scsi1, channel 0, id 7, lun 49
Attached scsi disk sdal at scsi1, channel 0, id 7, lun 50
Attached scsi disk sdam at scsi2, channel 0, id 2, lun 3
Attached scsi disk sdan at scsi2, channel 0, id 2, lun 6
Attached scsi disk sdao at scsi2, channel 0, id 2, lun 7
Attached scsi disk sdap at scsi2, channel 0, id 2, lun 10
Attached scsi disk sdaq at scsi2, channel 0, id 2, lun 11
Attached scsi disk sdar at scsi2, channel 0, id 2, lun 12
Attached scsi disk sdas at scsi2, channel 0, id 2, lun 13
Attached scsi disk sdat at scsi2, channel 0, id 2, lun 14
Attached scsi disk sdau at scsi2, channel 0, id 2, lun 24
Attached scsi disk sdav at scsi2, channel 0, id 4, lun 2
Attached scsi disk sdaw at scsi2, channel 0, id 4, lun 4
Attached scsi disk sdax at scsi2, channel 0, id 4, lun 5
Attached scsi disk sday at scsi2, channel 0, id 4, lun 8
Attached scsi disk sdaz at scsi2, channel 0, id 4, lun 9
Attached scsi disk sdba at scsi2, channel 0, id 5, lun 32
Attached scsi disk sdbb at scsi2, channel 0, id 5, lun 34
Attached scsi disk sdbc at scsi2, channel 0, id 5, lun 35
Attached scsi disk sdbd at scsi2, channel 0, id 5, lun 36
Attached scsi disk sdbe at scsi2, channel 0, id 5, lun 37
Attached scsi disk sdbf at scsi2, channel 0, id 5, lun 39
Attached scsi disk sdbg at scsi2, channel 0, id 5, lun 40
Attached scsi disk sdbh at scsi2, channel 0, id 5, lun 41
Attached scsi disk sdbi at scsi2, channel 0, id 5, lun 42
Attached scsi disk sdbj at scsi2, channel 0, id 5, lun 43
Attached scsi disk sdbk at scsi2, channel 0, id 5, lun 44
Attached scsi disk sdbl at scsi2, channel 0, id 5, lun 51
Attached scsi disk sdbm at scsi2, channel 0, id 5, lun 52
Attached scsi disk sdbn at scsi2, channel 0, id 5, lun 53
Attached scsi disk sdbo at scsi2, channel 0, id 5, lun 54
Attached scsi disk sdbp at scsi2, channel 0, id 7, lun 33
Attached scsi disk sdbq at scsi2, channel 0, id 7, lun 38
Attached scsi disk sdbr at scsi2, channel 0, id 7, lun 45
Attached scsi disk sdbs at scsi2, channel 0, id 7, lun 46
Attached scsi disk sdbt at scsi2, channel 0, id 7, lun 47
Attached scsi disk sdbu at scsi2, channel 0, id 7, lun 48
Attached scsi disk sdbv at scsi2, channel 0, id 7, lun 49
Attached scsi disk sdbw at scsi2, channel 0, id 7, lun 50


-- 
Sandor W. Sklar, Unix Systems Administrator
Stanford University Libraries & Academic Information Resources (SULAIR)
http://library.stanford.edu