Dynamic Multipathing with XP1024??

[Alan Hatch]

I need to set up dynamic multipathing on luns presented from an XP1024. I have qlogic 24XX hbas in a DL585 running RHEL 4.2.

Is any one using dm-multipath to achieve this against the xp1024?

Other ideas or suggestions?

Thanks.

[Steven E. Protter]

Shalom Alan,

Docs:
http://docs.hp.com/en/5991-0605/ch01s03.html
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&objectID=c00244240&jumpid=reg_R1002_USEN
http://h71028.www7.hp.com/ERC/downloads/4AA0-0716ENW.pdf
http://www.managementsoftware.hp.com/products/storage_data_protector/device_matrices/HPXP_SupportMatrix_DP55.pdf

Its either read or wait for someone to read for you.

HP does excellent documents.

SEP

[François Brugère]

Hello Alan and Steve,

I'm working actually on the same stuff. I'm trying to set up the multipathing against four LUSE from a XP1024 (each LUSE is the concatenation of ten OPEN-E LDEVs). The host is a ProLiant DL380G4 which is running RHEL4-U3 (x86_64) with 2 HBAs FC2214-DC. I set only two paths per LUSE on the XP1024. I followed the "Device Mapper Configuration Guide for HP Arrays" but I received this error message when I execute this commande : multipath -v0. I'm not able to obtain the wwid of each LUSE to set the multipatch section in file /etc/multipath.conf.

[root@frsgid02 scsi]# multipath -v0
error calling out /sbin/scsi_id -g -u -s /block/sda
error calling out /sbin/scsi_id -g -u -s /block/sdb
error calling out /sbin/scsi_id -g -u -s /block/sdc
error calling out /sbin/scsi_id -g -u -s /block/sdd
error calling out /sbin/scsi_id -g -u -s /block/sde
error calling out /sbin/scsi_id -g -u -s /block/sdf
error calling out /sbin/scsi_id -g -u -s /block/sdg
error calling out /sbin/scsi_id -g -u -s /block/sdh
[root@frsgid02 scsi]#

Here is the /etc/multipath.conf file :

defaults {
multipath_tool "/sbin/multipath -v0"
udev_dir /dev
polling_interval 10
selector "round-robin 0"
path_grouping_policy multibus
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
prio_callout "/bin/true"
default_features "0"
rr_min_io 100
failback immediate
}

devnode_blacklist {
wwid 26353900f02796769
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
devnode "^hd[a-z]"
devnode "^cciss!c[0-9]d[0-9]*"
}

device {
vendor "HP "
product "OPEN-*"
path_grouping_policy multibus
path_checker tur
failback immediate
}

Thanks in advance for any help.

Francois.

[Serviceguard for Linux · Accepted solution]

this should help:

http://search.hp.com/redirect.html?type=REG&qt=emulex+linux+multipath+%22device+mapper%22&url=http%3A//h20000.www2.hp.com/bc/docs/support/SupportManual/c00635587/c00635587.pdf%3Fjumpid%3Dreg_R1002_USEN&pos=1

[François Brugère]

Thanks for your answer "ServiceGuard for Linux" but I mentioned in my post that I have followed this guide.
Anyway, I think my problem is located in the XP1024. I need to check if the system modes 140 and 293 are switched on.

François.

[Alan Hatch]

Steven -- not sure what your sending me but thanks.

Francois -- I'm having the same issue, but have not read throught the "Device Mapper Configuration Guide" yet.

Service Gaurd -- Thanks for the link.

I will study the config guide, try again and post my results.

Thanks all for your help.

[Alan Hatch]

Thanks all for your help, unfortunately since the DMP solution is not recommended for production systems, I'm having to fall back to vxvm to handle the pathing.

Thanks again.

[Alan Hatch]

Thanks.