[Gluster-users] Convert to Sharding

Strahil Nikolov hunter86_bg at yahoo.com
Sat Mar 21 20:02:01 UTC 2020

On March 21, 2020 9:35:41 PM GMT+02:00, Christian Reiss <email at christian-reiss.de> wrote:
>Hey folks,
>Running CentOS7 with Gluster 7.0 in a single node instance with oVirt
>top (Home Virt Stuff). Everything is working flawlessly, but I just 
>noticed that I did not turn on sharding on the beginning. So I set
>gluster volume set ssd_storage features.shard on
>gluster volume set ssd_storage features.shard-block-size 64MB
>As per RedHat recommendations 
>and on new files I do see the shard files appearing. Any smart way to 
>move the current data to sharding?
>Stay safe and healthy folks.

Hey Christian,

Sharding is usefull if you have a VM disk larger than the brick, or for faster healing  (where  only the shard is being healed),  so you  won't benefit much unless  you have  multiple  bricks  there.

In your case , you can:
1. Stop the VM
2.  Copy the VM disk in the same directory
For example:
cp -a <uuid> <uuid>-new
sha512sum <uuid> | grep $(sha512sum  <uuid>-new |  awk '{print $1}')
3. Swap the old one with the new one:
mv  <uuid>-new  <uuid>
4. Power  up the VM and repeat for all vms


Best Regards,
Strahil Nikolov

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