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[dm-devel] xen on multipath



Very cool, the 2.6.10-udm1 patch applies cleanly on the xen modified linux tree.

xenone-sky:~# uname -a
Linux xenone-sky 2.6.10-xenU #1 Sun Jan 30 11:29:00 GMT 2005 i686 GNU/Linux
xenone-sky:~# mount
/dev/hda1 on / type ext3 (rw,errors=remount-ro)


xenone:/etc/xen# uname -a
Linux xenone 2.6.10-xen0xen0multipath #4 Sun Jan 30 14:38:14 GMT 2005 i686 GNU/Linux
xenone:/etc/xen# xm list
Name Id Mem(MB) CPU State Time(s) Console
Domain-0 0 123 0 r---- 114.5
sky 4 127 1 -b--- 6.5 9604
xenone:/etc/xen# xm vbd-list 4
(vbd (idx 0) (vdev 769) (device 64769) (mode w) (dev hda1) (uname phy:xen-a/xen-sky) (node xen-a/xen-sky) (index 0))
xenone:/etc/xen# lvscan
ACTIVE '/dev/xen-a/xen-sky' [10.00 GB] inherit
xenone:/etc/xen# pvscan
PV /dev/No VG xen-a lvm2 [20.00 GB / 10.00 GB free]
xenone:/etc# multipath -S -v 3 3600507680183001b0800000000000029
create: 3600507680183001b0800000000000029
[size=20 GB][features="0"][hwhandler="0"]
\_ round-robin 0 [first]
\_ 0:0:0:0 sda 8:0 [ready ]
\_ 0:0:2:0 sdc 8:32 [ready ]
\_ 1:0:2:0 sdg 8:96 [ready ]
\_ 1:0:3:0 sdh 8:112 [ready ]
\_ round-robin 0
\_ 0:0:1:0 sdb 8:16 [ready ]
\_ 0:0:3:0 sdd 8:48 [ready ]
\_ 1:0:0:0 sde 8:64 [ready ]
\_ 1:0:1:0 sdf 8:80 [ready ]



Woooo.... so the linux inside xen as no idea it is being multipathed, the hypervisor does all the good work.


Now going to try and migrate a xen node from one multipath hypervisor to another, and after that, try and get the xen box itself boot of the SAN :-)

Keep up the good work.

Cheers
Arthur

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CTO @ Fotango Ltd
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http://www.fotango.com/

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