[linux-lvm] lvm2: zeroing free space
Bryn M. Reeves
bmr at redhat.com
Fri Feb 4 14:12:03 UTC 2011
Recently had a query from someone using an array supporting thin provisioning
with zero page reclaim.
They wanted a method to write zeros to all the unallocated space in a VG to
trigger a reclaim of unused regions in the VG's PVs.
My suggestion was to lvcreate a -l100%FREE LV named "filler" and overwrite it
It seems like this might something a lot of users want as this functionality
gets to be more common.
I wondered if it could be worth adding a script to automate this or even an
option to vgchange (e.g. --zero-free-space)?
Didn't have time to try putting anything together yet but it seems such a
feature could be useful.
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