Messages in this thread | | | From | Neil Brown <> | Date | Wed, 11 Sep 2002 08:51:56 +1000 | Subject | Re: md multipath with disk missing ? |
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On Monday September 9, oktay.akbal@s-tec.de wrote: > > > Does this only work with raid-autodetection ? > > > When no autodetection is done and a drive is missing, would a raidstart > > > kill the raid, since the drives are now available with other devices (sda > > > instead of former sdb...) ? > > > > I don't understand your question, sorry. > > Example: > > We have sda - sdb (8 drives) and setup up a raidtab to tell linux that > sda and sde are the same sdc - sdd etc. > Now for some random error the server restarts and the former sda (path to > that drive) is no longer available. So now we have sda,sdb...sdg. > We do not use autodetect, but raidstart to activate the raid.
raidstart is broken by design and cannot cope with devices that change device number (whether name in /dev is preserved or not. There are device numbers in the superblock which raidstart trusts).
This is one of the reasons that I wrote mdadm http://www.cse.unsw.edu.au/~neilb/source/mdadm/
This affects all raid levels, not just multipath.
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