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Whitepaper: ReadyNAS FlexRAID Volume Optimization Guide

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Whitepaper:
Optimizing Your ReadyNAS® OS Flex-RAID Volumes
20
Volume Operation Available? Resulting RAID Level Notes
5
Add Parity RAID 6 RAID 6
Expand RAID 5 RAID 5
Add Group
Striped RAID 50
Concatenated RAID 5 Concatenated
RAID 1 or RAID 5
depending on number of
drives selected
6
Add Parity No n/a
Expand Yes RAID 6
Add Group
Striped RAID 60
Concatenated RAID 6 Concatenated
10
Add Parity No n/a
Expand Yes (6.8.0+) RAID 10
Add Group Yes RAID 10
50
Add Parity Yes RAID 60
Expand Yes RAID 50
Must have at least one
drive per RAID group
Add Group Striped RAID 50
60
Add Parity No n/a
Expand Yes RAID 60
Must have at least one
drive per RAID group
Add Group Striped RAID 60
11.6. Adding Groups
In addition to expanding your existing volumes, ReadyNAS allows you to add additional RAID groups to your volume.
Depending on your current RAID level, the data can be written in a striped or concatenated methodology.
Striped: Adds an additional RAID group in a striped configuration to your volume. This new RAID group will need to have the
same number of drives as the other RAID groups currently in the volume. Because it is striped, there will be additional drives
reading/writing to the RAID for every file operation so the overall performance of the volume increases.
Concatenated: Adds an additional RAID group in a concatenated configuration. This new RAID group does not need to have
the same number of drives as the other RAID groups in the volume which provides flexibility. However, because it is not striped
with the other RAID groups, reads and writes do not go beyond individual RAID groups in the volume and as a result the
overall performance of the volume remains unchanged.
11.7. Adding a Tier
ReadyTIER can only be used with Flex-RAID volumes. ReadyNAS OS 6.9 introduced metadata tiers. ReadyNAS OS 6.10
introduced data tiers. Tiers can be beneficial for a wide range of applications such as virtualization, database applications, and
file servers. Based on the size, amount, and type of data being written, ReadyTIER can potentially increase performance by up
to 20X (we observed a 20X increase in write performance in a lab environment with random synchronized writes). As this paper
shows, the performance depends heavily on the way the volume is used.