[Gluster-users] to RAID or not?

[tom at encoding.com]

If you go the ZFS route - be absolutely sure you set xattr=sa on all filesystems that will hold bricks BEFORE you create bricks on same.  Not doing so will cause major problems with data that should be deleted not being reclaimed until after a forced dismount or reboot (which can take hours -> days if there are several terabytes of data to reclaim.)

Setting it also vastly improves directory and stat() performance.

Setting it after the bricks had been created led to data inconsistencies and eventual data loss on a cluster we used to operate.

-t

> On Jul 4, 2016, at 4:35 PM, Lindsay Mathieson <lindsay.mathieson at gmail.com> wrote:
> 
> On 5/07/2016 12:54 AM, Gandalf Corvotempesta wrote:
>> No suggestions ?
>> 
>> Il 14 giu 2016 10:01 AM, "Gandalf Corvotempesta" <gandalf.corvotempesta at gmail.com <mailto:gandalf.corvotempesta at gmail.com>> ha scritto:
>> Let's assume a small cluster made by 3 servers, 12 disks/bricks each.
>> This cluster would be expanded to a maximum of 15 servers in near future.
>> 
>> What do you suggest, a JBOD or a RAID? Which RAID level?
> 
> 
> I setup my much smaller cluster with ZFS RAID10 on each node. 
> - Greatly increased the iops per node
> 
> - auto bitrot detection and repair
> 
> - SSD caches
> 
> - compression clawed back 30% of the disk space I lost to RAID10.
> -- 
> Lindsay Mathieson
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