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ReadyTIER with ReadyNAS Pro 6
Hi,
I've got a NAS Pro 6-bay system, currently on NASOS 6.9.5 hotfix 1 and loaded with 4 x WD RED 8 TB drives in FlexRAID RAID 5. Primary use case for the unit is as an NFS server for my VMwar...
sstillwell wrote:
So...here's my putting-the-cart-before-the-horse question: Do you know of any reason this shouldn't work when adding a 512 GB RAID1 SSD tier to the existing volume?
It should work in the Pro-6 (though you do need to change to flexraid in order to use ReadyTier).
The main challenge is adapting the trays for the SSDs, and you've already found mounting brackets for that part.
ReadyTier isn't caching the metadata, so if the SSD RAID group fails you will lose the volume. Your SSDs will reach their write limits at the same time. So you might want to replace one of them about half-way through it's expected life, so you can stagger the replacements.
Okay, I ran a rather lengthy iozone benchmark against the unit over gigabit Ethernet to an SMB share from my Mac Pro. For the most part everything caps at around 100 MB/sec as you'd expect, but there are some interesting graphs for re-read, re-write type operations where caching and SSD migration come into play.
Attached the Excel spreadsheet produced by iozone along with the column graphs I added for each table. *EDIT* Can't post excel spreadsheets, and I can't find a good way to format it to PDF...bummer.
I guess the takeaway from this is that for many use cases, the network is going to be your limiting factor. Doesn't mean it's not worth doing for those things that DO benefit from tiering. The things that benefit REALLY benefit.
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