[Gluster-users] Node count constraints with EC?

[Gandalf Corvotempesta]

How can I ensure that each parity brick is stored on a different server ?

Il 30 mar 2017 6:50 AM, "Ashish Pandey" <aspandey at redhat.com> ha scritto:

> Hi Terry,
>
> There is not constraint on number of nodes for erasure coded volumes.
> However, there are some suggestions to keep in mind.
>
> If you have 4+2 configuration, that means you can loose maximum 2 bricks
> at a time without loosing your volume for IO.
> These bricks may fail because of node crash or node disconnection. That is
> why it is always good to have all the 6 bricks on 6 different nodes. If you
> have 3 bricks on one node and this nodes goes down then you
> will loose the volume and it will be inaccessible.
> So just keep in mind that you should not loose more than redundancy bricks
> even if any one node goes down.
>
> ----
> Ashish
>
>
> ------------------------------
> *From: *"Terry McGuire" <tmcguire at ualberta.ca>
> *To: *gluster-users at gluster.org
> *Sent: *Wednesday, March 29, 2017 11:59:32 PM
> *Subject: *[Gluster-users] Node count constraints with EC?
>
> Hello list.  Newbie question:  I’m building a low-performance/low-cost
> storage service with a starting size of about 500TB, and want to use
> Gluster with erasure coding.  I’m considering subvolumes of maybe 4+2, or
> 8+3 or 4.  I was thinking I’d spread these over 4 nodes, and add single
> nodes over time, with subvolumes rearranged over new nodes to maintain
> protection from whole node failures.
>
> However, reading through some RedHat-provided documentation, they seem to
> suggest that node counts should be a multiple of 3, 6 or 12, depending on
> subvolume config.  Is this actually a requirement, or is it only a
> suggestion for best performance or something?
>
> Can anyone comment on node count constraints with erasure coded subvolumes?
>
> Thanks in advance for anyone’s reply,
> Terry
>
> _____________________________
> Terry McGuire
> Information Services and Technology (IST)
> University of Alberta
> Edmonton, Alberta, Canada  T6G 2H1
> Phone:  780-492-9422 <(780)%20492-9422>
>
>
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