Multipath in RHEL 5.4 HP FC2142SR and EVA4400

[WilliamSmith11]

Hi
I have a new rx6600 running RHEL verion 5.4 , kernel 2.6.18-128.2.1.el5.
I have attached an EVA4400 (direct attach).I have presented a virtual disk 22GB , the problem is that I see two disk instead one.So I configure multipath but it seams it is not working. In the attachment file can be see the /etc/multopath.conf file.

I followed this link to configure the /etc/multipath.conf

http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?lang=
en&cc=us&prodTypeId=12169&prodSeriesId=3559651&swItem=co-71367-1&prodN
ameId=3559652&swEnvOID=4005&swLang=13&taskId=135&mode=4&idx=0

Here is the output for the
# fdisk -l
Disk /dev/sda: 23.6 GB, 23622320128 bytes
64 heads, 32 sectors/track, 22528 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes

Disk /dev/sda doesn't contain a valid partition table

Disk /dev/sdb: 23.6 GB, 23622320128 bytes
64 heads, 32 sectors/track, 22528 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes

Disk /dev/sdb doesn't contain a valid partition table
The storage volume manager GUI see /dev/sda and the /dev/sdb device.

Help are welcome

Regards

W.S

[WilliamSmith11]

I forgot to say that the
device-mapper-multipath
device-mapper-event
device-mapper

are installed

[Khairy]

hi,

make sure you add the following in /etc/modprobe.conf file
options scsi_mod max_scsi_luns=255

restart multipath
# /etc/init.d/multipath restart

Please post output of the following:
# multipath -ll

if above show your device, rescan to create mpath files
# multipath -v3

Post output of multipath -ll

Rgds

[Jimmy Vance]

Install the HPDM Multipath Enablement kit 4.3.0. The main thing you need out of the kit is the multipath.conf.template

You can download the HPDM Multipath Enablement Kit for HP StorageWorks Disk Arrays v4.3.0 at http://www.hp.com/go/devicemapper.

[dirk dierickx]

once multipath is active do NOT use the /dev/sd* devices to access your multipathed disks!

you should use /dev/mapper/mpath* instead.

see RH KB article:
http://kbase.redhat.com/faq/docs/DOC-5551

[Alzhy]

If you see only 2 disk devices for the VDISK -- then that means you only have 1 FC HBA on your rx6600.

The Install of the HP Multipathing kit simply copies the correct multipath.conf so it contains all entries for all of HP Storageworks family of disk arrays.

After the install, you should do multipath -v2 and you multipath device should be something like /dev/dm-N -- which you should use under LVM or VxVM or use as is as an ext2/3 filesystem

[WilliamSmith11]

I was doing a direct attach with the EVA4400, connecting directly the FP1s ports of the controller to the HBAs.

The other port were not conected.

All is fine now .

Thank you .

[Alzhy]

Wow.. so one can connect each HBA to each HSV300 controller FP ports direct? I did not know sucj is possible and supported. I turst you'er waiting on a SAN switch or something? Or Your EVA is really to serve only one 2 servers?

[WilliamSmith11]

Yes it work,
The customer was requiring a fast solution , with enought disk space and that was availble.

[WilliamSmith11]

Oh but remember to change the FP port configuration from fabric to direct