[linux-lvm] lvextend-lvreduce

Heinz J . Mauelshagen mauelshagen at sistina.com
Thu Apr 25 04:58:01 UTC 2002

On Wed, Apr 24, 2002 at 12:48:56PM +0530, Chitaranjan Behera, Noida wrote:
> Hi,
> I tried to do lvextend and then lvreduce (same space) without unmounting the
> file system, bcoz of online read/write operation on that file system. System
> seems slow (almost hanged). So can anybody please tell me whether the SAME
> extended block is reduced by the lvreduce command or not.

If you extend a LV, N extents are added to its former end.
If you reduce it by the very same amount N of extents afterwards the very
same N extents are freed.

> And what could be
> the reason of system hang.

Probably locking caused by the filesystem accesses.
Which version of LVM are you using?

Heinz    -- The LVM Guy --

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> Regards,
> Chitaranjan
> 91-4510701/02   Ext -3159
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Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
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Mauelshagen at Sistina.com                           +49 2626 141200
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