[Gluster-users] JBOD / ZFS / Flash backed

Vincent Royer vincent at epicenergy.ca
Wed Apr 4 19:58:46 UTC 2018

thanks for your reply,

Yes the VMs are very small and provide only a single service, I would
prefer a total of 2TB but 1TB to start is sufficient.  Ideally I want a
scheme that is easy to expand by dropping an extra disk in each node. When
all slots are full, add another node.

our current setup accesses a storage share via NFS, most read/write
operations under load are under 4MB. There isn't any long sequential I/O.

Currently we have 2 nodes, I am specing the 3rd and adding necessary
components to the existing.  Budget around $20k for the upgrade.

On Wed, Apr 4, 2018 at 12:49 PM, Alex Chekholko <alex at calicolabs.com> wrote:

> Based on your message, it sounds like your total usable capacity
> requirement is around <1TB.  With a modern SSD, you'll get something like
> 40k theoretical IOPs for 4k I/O size.
> You don't mention budget.  What is your budget?  You mention "4MB
> operations", where is that requirement coming from?
> On Wed, Apr 4, 2018 at 12:41 PM, Vincent Royer <vincent at epicenergy.ca>
> wrote:
>> Hi,
>> Trying to make the most of a limited budget.  I need fast I/O for
>> operations under 4MB, and high availability of VMs in an Ovirt cluster.
>> I Have 3 nodes running Ovirt and want to rebuild them with hardware for
>> converging storage.
>> Should I use 2 960GB SSDs in RAID1 in each node, replica 3?
>> Or can I get away with 1 larger SSD per node, JBOD, replica 3?
>> Is a flash-backed Raid required for JBOD, and should it be 1gb, 2, or 4gb
>> flash?
>> Storage network will be 10gbe.
>> Enterprise SSDs and Flash-backed raid is very expensive, so I want to
>> ensure the investment will provide best value in terms of capacity,
>> performance, and availability.
>> Thanks,
>> Vincent
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>> Gluster-users at gluster.org
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