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Hi, 1. In RHEL4 U2, when a device alias is
created by modifying /etc/multipath.conf file, the new DM device is created
along with the existing DM device for which the alias is created. Both devices exist
in /dev/mapper/ directory. When “multipath –ll” is executed,
both original device and the device with alias name are displayed. We can have
different device policies like path grouping etc for both of these devices. User
need to either reboot or run “multipath –f <wwid> to remove
the existing device for which alias was created. I think we should have only
one device when alias is created. Any suggestions? This is not a problem as
user can go and delete/flush the original device. 2. Blacklisting of the device is possible using
“wwid <wwn>” in blacklist block in /etc/multipath.conf. Is
there any way to blacklist the device created with alias? Giving an alias name
in devnode or wwid doesn’t seem to work. 3. As it is not encouraged dmsetup utility to
be used for multipathing devices, features like suspend and resume will be
useful in bringing down the device for maintenance purposes. Any thoughts? Thanks!! |
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