Any limitations of LUN masking to veritas netbackup appliance 5240 for SAN VMWARE backups

[raeedi239]

Any limitations of LUN masking to veritas netbackup appliance 5240 for SAN VMWARE backups. since am able to see 31 LUNS out of 198. please provide your needful inputs.

thanks in advance

[Marianne]

The Linux defauls on the Appliance allows much more than that. 

The Linux version on the Appliance should be 6 or 7. 

See this URL for Linux and QLogic defaults: http://unixsol4u.blogspot.com/2014/01/how-do-isetup-multiple-luns-on-red-hat.html

• The default setting for qla2xxx.ql2xmaxlun is 65535. This can be checked with the following command (RHEL5 and above only).

# cat /sys/module/qla2xxx/parameters/ql2xmaxlun
65535

• The default setting for scsi_mod.max_luns (SCSI mid layer) is 512. This can be checked with the following command.

# cat /sys/module/scsi_mod/parameters/max_luns
512

According to this URL: https://access.redhat.com/solutions/3292
RHEL5,6 default : 511 luns 
RHEL7 default:16,383 luns 

So, if you cannot see all VMware LUNs on the appliance, you need to double-check lun masking as well as zoning. 

[raeedi239]

Hello Marianne,

thank you very much for the information.

however in my case we are using FC. could you help me if there is any limitations here.

[Marianne]

Not sure if you knew this:

Fibre Channel Protocol (FCP) is the SCSI interface protocol utilising an underlying Fibre Channel connection.
https://en.m.wikipedia.org/wiki/Fibre_Channel_Protocol

[Marianne]

@raeedi239 

One more thing - you may have noticed that FC disks are still seen by the OS  as 'sd' devices.
sd stands for SCSI disk. 
Same with FC tape - presented to the OS as st (scsi tape) devices.
FC disk and tape are still presented to the OS as SCSI devices.
Lots of useful articles on wikipedia and other sites. 
Look for SCSI over Fibre Channel Protocol (FCP).