eda500 options (is this thing problematic?)

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Blanker-2 wrote:
Ok. How about overal responsiveness or anything else that would benefit from having ssds?

In general, SSDs improve I/Os per second, because they never have to seek.  They won't help transfer speeds much on long files, since those are limited by the ethernet speed. 

A pure SSD volume will have much better small-file transfers and directory browsing would be much quicker.  The hybrid "SSD metadata tiering" would give the same benefits on directory browsing, and also reduces seeking on the mechanical hard drive - not as fast overall, but you are getting the bigger capacity of the mechanical disks.

But it sounds like you are only planning to use them for the OS partition - is that correct?  If so, the OS itself would never be blocked waiting for disk seeks.  That won't gain you much (if any) performance. But If you have some shares (photos for instance) that have lots of small files in them, then you could set up a RAID-1 volume on the SSDs and move those shares there.

Thanks Sandshark!

Blanker-2, you can do ReadyTier.  From the user guide:

ReadyTier or tiering is a performance increasing technology that stores different types of data in tiers based on the
performance characteristics of available media on the system. It can be beneficial for a wide range of applications such
as virtualization, database applications, and file servers. With ReadyNAS 6.9, users can now add an SSD tier to their Flex-
RAID volume and leverage the low latency of SSDs to increase I/O performance. In 6.9.0, meta-data will be written to
the higher tier while general data will be written to the mechanical hard drive tier. Based on the size/amount/type of
data being written, tiering can potentially increase performance by up to 20X. (We observed a 20X increase in write
performance in a lab environment with random synchronized writes)