Re: Can not see LUNs attached to FA's above 255 on EMC DMX using RHEL5.1 and emulex HBA'a

On 16/04/2008, Thomas Fess <dfezz1@xxxxxxxxx> wrote:

Can not see LUNs attached to FA's above 255 on EMC DMX
using RHEL5.1 and emulex HBA'a


1. Redhat 5.1

2. Emulex HBA's

3. SAN = EMC DMX = FA's are > 255

4. Can not set the Emulex cards or Linux to support
about 255

5. Trying offset on the SAN but, it's not working.

6. We can see the 3 of the 4 SAN disks the FRA is on a
lun greater then 255 and can't be seen from the
server.

7. Have installed HBAnywhere and tried to reset the
lun_id #
./hbacmd GetDriverParams 10:00:00:00:c9:6d:xx:xx G P
max-luns fff

8. Also have modified the kernel (ram disk)
mkinitrd -v initrd-2.6.18-53.el5.new-4-16-08.img
2.6.18-53.el5

9. Can't get the server to support more then 255 lun
IDs

10. modprobe.conf
[root@foobar /boot]# cat /etc/modprobe.conf
alias eth0 bnx2
alias eth1 bnx2
alias eth2 igb
alias eth3 igb
alias eth4 igb
alias eth5 igb
alias scsi_hostadapter megaraid_sas
alias scsi_hostadapter1 ata_piix
alias scsi_hostadapter2 lpfc
alias scsi_hostadapter3 usb-storage
## Tried this first## options scsi_mod
max_scsi_luns=550 scsi_allow_ghost_devices=1

###BEGINPP
include /etc/modprobe.conf.pp
###ENDPP

# Emulex lpfc options
##tried this second### options lpfc lpfc_max_luns=4095


########################################################################

[root@foobar boot]# inq
Inquiry utility, Version V7.3-872 (Rev 0.0) (SIL
Version V6.5.0.0 (Edit Level 872)
Copyright (C) by EMC Corporation, all rights reserved.
For help type inq -h.

...............

-------------------------------------------------------------------------
DEVICE :VEND :PROD :REV :SER NUM :CAP(kb)
-------------------------------------------------------------------------
/dev/sda ELL :PERC 6/i :1.11 : : 71041024
/dev/sdb :EMC :SYMMETRIX :5771 :8700040000 : 5760
/dev/sdc :EMC :SYMMETRIX :5771 :8701791008 : 70709760
/dev/sdd :EMC :SYMMETRIX :5771 :870175a008 : 70709760
/dev/sde :EMC :SYMMETRIX :5771 :87016bf008 : 70709760
/dev/sdf :EMC :SYMMETRIX :5771 :8700040000 : 5760
/dev/sdg :EMC :SYMMETRIX :5771 :8700040000 : 5760
/dev/sdh :EMC :SYMMETRIX :5771 :8701791008 : 70709760
/dev/sdi :EMC :SYMMETRIX :5771 :870175a008 : 70709760
/dev/sdj :EMC :SYMMETRIX :5771 :87016bf008 : 70709760
/dev/sdk :EMC :SYMMETRIX :5771 :8700040000 : 5760
/dev/sdl ell :Virtual Floppy :123 : : FAILED
/dev/emcpowera :EMC :SYMMETRIX :5771 :8701791008 :
70709760
/dev/emcpowerb :EMC :SYMMETRIX :5771 :870175a008 :
70709760
/dev/emcpowerc :EMC :SYMMETRIX :5771 :87016bf008 :
70709760


I should see another disk:

e.g.
/dev/emcpowerd :EMC :SYMMETRIX :5771 :87016bxxxx :
70709760

notice the 6mb connections
This is killing me!!!

Thanks in advance, I hope someone even can understand
what I am trying to explain.
Computers are hard!!!
-dfezz1


As far as I recall, 256 is a linux limit.

Any possibility of putting the LUNs in larger HW arrays on your SAN so as to
limit the number of LUNs you're importing?

Kind regards,

Herta


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