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

[Herta Van den Eynde]

On 16/04/2008, Thomas Fess <dfezz1 at yahoo.com> 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 at 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 at 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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