How many sg devices do typically support 2.6 kernels.

[Masthan]

As per sub..

[Stuart Browne]

How many do you need?

By default, RHEL4 supports 16 (a-p).

That being said, this is from the 'Linux Allocated Devices' documentation:

21 char Generic SCSI access
0 = /dev/sg0 First generic SCSI device
1 = /dev/sg1 Second generic SCSI device
...

Most distributions name these /dev/sga, /dev/sgb...;
this sets an unnecessary limit of 26 SCSI devices in
the system and is counter to standard Linux
device-naming practice.

[Stuart Browne]

Dang, meant to hit edit..

So, what that little block of text means (from http://www.lanana.org/docs/device-list/devices.txt by the way) is that Linux can support up to 254 (0-255) without any issue.