Hello Radosław,
There may be a place for an option that puts back zeros where zeros were
read as Bastian is requesting, but it is clear that this code would
break the
current behavior of sparse file (sparse volume) handling, which is not
desirable.
Best regards,
Kern
On 08/06/2012 08:35 PM, Radosław Korzeniewski wrote:
Hello,
2012/7/27 Bastian Friedrich <bastian.friedr...@collax.com
<mailto:bastian.friedr...@collax.com>>
the attached patch modifies Bacula's behavior during restore of
data that
originates from a block device with the "sparse" option set.
Instead of simply
seeking to the requested file position, zero bytes are written to the
file/device in chunks of 64k.
Well, what about a thin-provisioned volumes/disks?
The main problem is that someone was used a sparse=yes option with
raw-device (lvm) which do not support thin-provisioning (something
like sparse file on fs).
If a user will have a thin-provisioned volume that he can successfully
use sparse=yes option without any garbage and can use it even with a
vm image. A lot of enterprise users use this functionality in their
storage environments. We shouldn't change this behavior without a deep
discussion about pros. and cons. of it.
All we should do is to explicitly add a correct information (even a
warning) to the documentation. No change in code, please.
--
Radosław Korzeniewski
rados...@korzeniewski.net <mailto:rados...@korzeniewski.net>
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