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carillonator
Asked: 2010-12-28 12:55:41 +0800 CST

is multipath -F safe? (flush all unused paths)

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from multipath manpage:

-F     flush all unused multipath device maps

is this a safe operation? I have a bunch of old dead paths and would like to clear them out, but want to make sure it's absolutely safe to do. I've heard ql-scan-lun.sh -r, which is supposed to do the same thing, can interrupt visibility of all the LUNS. using qlogic qla2xxx hbas.

linux storage-area-network multipath

1 Answers

  1. Best Answer

    Yes, it is safe. However, if any other subsystem is using them (lvm, mount) or you have queued I/Os the paths won't be flushed and you'll need to figure out why.

    Edit: use -f device to be safe.

    See http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Online_Storage_Reconfiguration_Guide/removing_devices.html

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