topic Re: Dynamic Multipathing with XP1024?? in Operating System - Linux

Dynamic Multipathing with XP1024??

Alan Hatch — Fri, 16 Jun 2006 18:26:54 GMT

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.

Re: Dynamic Multipathing with XP1024??

Steven E. Protter — Sun, 18 Jun 2006 03:00:56 GMT

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

Re: Dynamic Multipathing with XP1024??

François Brugère — Mon, 19 Jun 2006 05:43:19 GMT

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.

Re: Dynamic Multipathing with XP1024??

Serviceguard for Linux — Mon, 19 Jun 2006 09:17:21 GMT

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

Re: Dynamic Multipathing with XP1024??

François Brugère — Mon, 19 Jun 2006 09:58:10 GMT

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.

FranÃ§ois.

Re: Dynamic Multipathing with XP1024??

Alan Hatch — Mon, 19 Jun 2006 14:20:32 GMT

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.

Re: Dynamic Multipathing with XP1024??

Alan Hatch — Mon, 03 Jul 2006 08:58:12 GMT

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.

Re: Dynamic Multipathing with XP1024??

Alan Hatch — Mon, 03 Jul 2006 09:00:10 GMT

Thanks.