[DRBD-user] Re: Can LVM block I/O and hang a system?

Maurice Volaski mvolaski at aecom.yu.edu
Wed Sep 12 22:18:42 CEST 2007

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Oh, this is good to know, but the peer was unattached during the 
initial hanging and when I fscked.

At 4:04 PM -0400 9/12/07, linux-lvm-request at redhat.com wrote:
>please use drbd 8.0.6 with kernels that do not allow recursion in
>generic_make_request, otherwise any lock is likely to be caused by this.
>then, if there are still lockups, these may be caused by lvm, and may be
>due to some similar problem, namely doing synchronous (housekeeping) io
>from within the generic_make_request path within the same "thread".

For drbd mailing list readers, who didn't see the original message, 
the kernel version I am using is Gentoo 2.6.22-r3. (I don't know 
whether this will still be true of kernels after 22-r3.)

Maurice Volaski, mvolaski at aecom.yu.edu
Computing Support, Rose F. Kennedy Center
Albert Einstein College of Medicine of Yeshiva University

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