[ale] DIY NAS vs Boxed NAS?

[Jim Kinney]

I use gluster extensively at work. It's basically RAID over TCP in that config. Lots and lots of drives, 2 external drive arrays with multipath SAS3, etc, 3 fully redundant systems each with internal drives, external array, IB connection and 40Gb ethernet and total raw storage of 240TB each and 16 unused drive bays and the ability to chain drive arrays up to 512 drives.

Gluster can also be setup like RAID0 (mine is raid1) to stripe across multiple machines. It can be tweaked be a raid 10 style.

If using gluster storage underneath Ovirt virtual machine management, it can run "shards", or data slices, as replication units. 

So for this thread, gluster is a solid way to provide expandable storage using commodity hardware.

Note: the gluster client default mount is fuse so it's slow. Each write command blocks until confirmation from all gluster nodes completes. For N nodes, reads are 1/N but writes are xN. Solutions are to use other mount types like built-in nfs or gluster specific nfs-ganesha. The new storhaug is utter crap right now. Apparently NFSv4.2 with pNFS is an option. It may need gluster 4 or later. I'm still on 3.12.

On December 12, 2018 11:19:40 PM EST, George Allen <glallen01 at gmail.com> wrote:
>A friend just showed me this post re 200T Gluster setup on odroids:
>https://www.reddit.com/r/DataHoarder/comments/8ocjxz/200tb_glusterfs_odroid_hc2_build/
>
>
>On Sun, Dec 9, 2018 at 8:35 AM Jim Kinney via Ale <ale at ale.org> wrote:
>
>> Hmm. I'm wondering if active noise cancellation would be a good
>solution
>> for fan noise. It's a consistent sound which should be easy to build.
>>
>> On December 8, 2018 3:28:20 PM EST, Alex Carver via Ale <ale at ale.org>
>> wrote:
>>>
>>> That would work assuming the cases were actually 200 mm wide.  Most
>are
>>> about 175 mm wide (tower style).
>>>
>>> On 2018-12-05 15:00, DJ-Pfulio via Ale wrote:
>>>
>>>> Dremel the side panel?
>>>>
>>>> Don't tell me you don't have plexiglass there for the RGB lighting.
> Gotta have
>>>> that.  Adding a 200mm fan shouldn't be too hard.
>>>>
>>>>  They make 200mm fans, and those things are very, very quiet while
>>>>>>  moving quite a bit of air.
>>>>>>
>>>>>>
>>>>>  Well, I know, I have a catalog with fans of all sizes but
>standard
>>>>>  computer cases only support a typical size of 120 mm with some
>>>>>  supporting 140 mm.  Cases with mount points (and vents) large
>enough to
>>>>>  support even bigger fans are harder to get.
>>>>>
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