Whitepaper: ReadyNAS FlexRAID Volume Optimization Guide

Whitepaper:
Optimizing Your ReadyNAS® OS Flex-RAID Volumes
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Requirements for ReadyTIER:
1. The ReadyNAS is running 6.9.0 and above.
2. The ReadyNAS must be in Flex-RAID mode and not
X-RAID.
3. If there is more than one RAID group in the volume, then
the volume must be a concatenated volume. (You cannot
add a tier to a striped volume)
4. The number of SSDs for the SSD tier should be equal to
the number of drives in the RAID group.
To add a tier, start by selecting unused SSDs in the device
view.
When the requirements for the number of selected SSDs are
met, the button Add Group will change to Add Tier.
Click on Add Tier and follow the on-screen instructions.
(NOTE: general system performance during migration may
be slowed, so schedule the migration for times when the
system is less busy.)
How much space is needed for the high tier (or how large the
high tier SSDs should be) depends on how much metadata
that volume currently has and how much you anticipate
it growing. To see how much space is currently used for
metadata, hover over the data pie chart of your existing
volume.