[linux-lvm] Re: Recovering from disk failure
mru at users.sourceforge.net
Thu Aug 28 19:32:01 UTC 2003
mru at users.sourceforge.net (Måns Rullgård) writes:
>>> Recently one of two disks in a volume group crashed, and I can't read
>>> it at all. Now, some LVs are entirely on the disk that survived. Is
>>> there any way I can just disable the broken LVs and continue using the
>>> complete ones? I'm using device-mapper and LVM2
>> Read the description of '--partial' on the lvm(8) man page.
>> e.g. (lv|vg)change -ay --partial
> I should have read the manuals before mailing. However, I still have
> some questions. Some LVs were split between the two disks. With the
> --partial option, it won't let me see them at all. Can I do something
> to get just read errors, or zeros, or whatever for the missing
> sectors? I could of course do some manual work with dd, but an
> automated method seems easier.
I figured it out, after reading some source code to determine that the
dmsetup man page is incorrect. It tried to tell me that the
"target_type" for an all-errors mapping is "io-err", when it is in
fact "error". Someone should fix this.
mru at users.sf.net
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