topic Re: LUN allocation & detecting the LUNs st OS level in Operating System - Linux

LUN allocation & detecting the LUNs st OS level

ASIFKHAN — Thu, 11 Feb 2010 05:08:41 GMT

Hi Friends,

I have done zoning of one dell server with EVA8000 sucessfully and thereafter i assigned 3 LUNs to these Hosts.

OS running at this host is RHEL5.3 now i am not able to detect the LUNs which have been assigned to this host OS that i can create volume groups & Fielsystem & all...
So anyone of you is aware of how to detect the LUNS at RHEL 5.3 level.what could be the device file name for it ??
I tried dmesg but i couldn't get any success.

Thanks
MAK

Re: LUN allocation & detecting the LUNs st OS level

Michal Kapalka (mikap) — Thu, 11 Feb 2010 06:13:55 GMT

hi,

you have two possibilities, if you reboot the server the new assigned LUNS should be should be presented to the server, or you could do it online.

rescan linux scsi bus for new san luns without reboot

http://www.unixunderground.com/blog/?p=48

http://kbase.redhat.com/faq/docs/DOC-3942

mikap

Re: LUN allocation & detecting the LUNs st OS level

AnthonySN — Thu, 11 Feb 2010 11:41:32 GMT

first reboot.
if the luns done appear then recheck your zoning.

Re: LUN allocation & detecting the LUNs st OS level

Basheer_2 — Sat, 13 Feb 2010 12:18:23 GMT

Dear Khan Saab,

This is what I did on my SUSE Linux v 10, SP2

1) downloaded the qloginc drivers (I have qlogic HBA's , HP DL380G5)

2) Installed the rpm using yast (similar to old rpm -i)

3) added zoning info to the swich

4) Also downloaded the scli utility from the qlogic

5) install the scli utility (SANsurferCLI)

then do

scli ( menu driven)

Re: LUN allocation & detecting the LUNs st OS level

badaim — Mon, 15 Feb 2010 13:30:19 GMT

Hi,

Run command lsscsi and show output

Re: LUN allocation & detecting the LUNs st OS level

Thomas Vogt (CH) — Mon, 15 Feb 2010 14:33:21 GMT

Hi,

I suggest to use the device mapper multipath package (HPDM) from HP, it's not only a failover solution but an active-active multipathing SAN driver.

http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01475580〈=en&cc=us&taskId=101&prodSeriesId=3559651&prodTypeId=12169

Cheers
- Thomas

Re: LUN allocation & detecting the LUNs st OS level

Basheer_2 — Tue, 16 Feb 2010 05:37:59 GMT

Salaams Khan Saab,

I just did this on SUSE and EVA8000.

chkconfig --list multipathd
multipath -ll

ls /dev/mapper

let me know if you need the detail instructions.

Re: LUN allocation & detecting the LUNs st OS level

ASIFKHAN — Tue, 16 Feb 2010 09:30:17 GMT

Thanks for replies..

See i cannot reboot this server sue to unaivaliablity of downtime.
Second thing zoning is ok since i am able to see some of the LUNs from EVA8K in /proc/scsi/scsi file.

Waale-kum-Asslam Basheer,

Can you please give some more details about SANsurferCLI.

chkconfig --list multipathd:
OP:
[root@bpcides ~]# chkconfig --list multipathd
multipathd 0:off 1:off 2:off 3:on 4:off 5:on 6:off

[root@bpcides ~]# ls /dev/mapper
control VolGroup00-LogVol00 VolGroup00-LogVol01 VolGroup00-LogVol02

Dear badaim: tried to run lsscsi & got the output :
[root@bpcides ~]# lsscsi
-bash: lsscsi: command not found

And also HPDM is installed & after its installation only we are getting the below messgaes in dmesg :

scsi 4:0:3:0: Attached scsi generic sg11 type 12
device-mapper: multipath round-robin: version 1.0.0 loaded
device-mapper: table: 253:3: multipath: error getting device
device-mapper: ioctl: error adding target to table

Still issue is not resolved.

Thanks:
Mohd Asif Khan

Re: LUN allocation & detecting the LUNs st OS level

badaim — Tue, 16 Feb 2010 09:45:25 GMT

OK, then try to install packet lsscsi from rpm, search on rpm.pbone.net or other rpm sites or try to install from yum repos. There is also sg3-utils package, it gives a lot of information when you type sg_scan -i.

First of all try:

yum install lsscsi*
yum install sg3-utils

If fails search by rpm sites.

Re: LUN allocation & detecting the LUNs st OS level

Thomas Vogt (CH) — Tue, 16 Feb 2010 14:51:18 GMT

Hi MAK,

Please post output of the following commands:

# dmsetup ls --target=multipath

# multipath -v2

# multipath -ll

Cheers
- Thomas