Have you considered getting a disk shelf, such as a Dell MD1000? Its 3RU
with 15 disks, connects via SAS to your server (it's cousin the MD3000i
does iSCSI) so you can then export the storage with NFS or iSCSI or what
ever it is you want to do. They do SAS and nearline SAS for the drives
(you can use SATA disks with an interposer).
You get good hardware for a reasonable price and depending on where you
purchase one you get a good warranty. For future expansion you can chain
multiple shelves together (not 100% if they need to be chained to a MD3000).
If you need HA it's not too much work to get fail over working with two
servers so that if a server fails data keeps moving (the shelf has 2 x
PSU, 2 x RAID controllers that are hot swap).
If its for enterprise use personally I wouldn't bother. It costs more an
enterprise NAS or SAN but it is well worth it for the easy warranty and
other features that you get that just work.
I have also used a backblaze box in the past, its cheap but does the
job. It suffers a bit with random I/O but for my purpose its perfect
(for backups). IT has a few problems such as no hot swap PSU's, the
drives can't really be hotswapped easily in a rack environment (you need
to pull the top off, if its at the top of a rack forget it) etc. but the
space savings make up for it.
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