On Mon, Nov 9, 2015 at 8:16 PM, Wido den Hollander <wido@xxxxxxxx> wrote:
On 11/09/2015 05:27 PM, Vickey Singh wrote:
> Hello Ceph Geeks
>
> Need your comments with my understanding on straw2.
>
> - Is Straw2 better than straw ?
It is not persé better then straw(1).
straw2 distributes data better when not all OSDs are equally sized/weighted.
> - Is it straw2 recommended for production usage ?
>
I'm using it in multiple clusters and it works fine.
Yes i followed your update on twitter :)
> I have a production Ceph Firefly cluster , that i am going to upgrade to
> Ceph hammer pretty soon. Should i use straw2 for all my ceph pools ?
>
I would upgrade to Hammer first and make sure that ALL clients are updated.
In case you are using KVM/Qemu, you will have to stop those processes
first and start them again before they are using the new code.
Thanks a lot for this pointer, i didn't knew this. So restarting KVM / QEMU process effect running VMs ? ( some downtime )
> Also how can i change from straw to straw2. ( should i decompile crush map
> and replace all straw with straw2) ?
>
Yes, that's it. Extract, decompile, replace, compile, inject.
$ ceph osd getcrushmap -o crushmap
$ crushtool -d crushmap -o crushmap.txt
$ <edit crushmap.txt>
$ crushtool -c crushmap.txt -o crushmap.new
$ ceph osd setcrushmap -i crushmap.new
In case stuff goes wrong, inject the original crushmap.
Wido
Thank You so much for your time in replying to my queries :)
> Please suggest
>
> Thank You in advance.
>
> - Vickey -
>
>
>
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--
Wido den Hollander
42on B.V.
Ceph trainer and consultant
Phone: +31 (0)20 700 9902
Skype: contact42on
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