[Gluster-users] Questions about healing

Alastair Neil
Fri, 20 May 2016 18:14:07 -0000

I think you are confused about what sharding does.   In a sharded replica 3
volume all the shards exist on all the replicas so there is no
distribution.  Might you be getting confused with erasure coding?  The
upshot of sharding is that if you have a failure, instead of healing
multiple gigabyte vm files for example, you only heal the shards that have
changed. This generally shortens the heal time dramatically.

Alastair

On 18 May 2016 at 12:54, Gandalf Corvotempesta <
gandalf.corvotempesta at gmail.com> wrote:

> Il 18/05/2016 13:55, Kevin Lemonnier ha scritto:
>
>> Yes, that's why you need to use sharding. With sharding, the heal
is much
>> quicker and the whole VM isn't freezed during the heal, only the
shard
>> being healed. I'm testing that right now myself and that's
almost invisible
>> for the VM using 3.7.11. Use the latest version though, it really
really
>> wasn't transparent in 3.7.6 :).
>>
> I don't like sharding. With sharing all "files" are split in
shard and
> distributed across the whole cluster.
> If everything went bad, reconstructing a file from it shards could be hard.
>
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