Asus DS300j G2 Series User Manual page 195

RAID 60 Logical Drive
No. of Drives No. of Axles Drives per Axle
8 2 4,4
9 2 4,5
10 2 5,5
11 2 5,6
12 2 6,6
3 4,4,4
13 2 6,7
3 4,4,5
14 2 7,7
3 4,5,5
15 2 7,8
3 5,5,5
16 2 8,8
3 5,5,6
4 4,4,4,4
Advantages
• High Read data transaction rate
• Medium Write data transaction rate
• Good aggregate transfer rate
• Safest RAID level
Recommended Applications for RAID 60:
• Accounting and Financial
• Database servers
• Any application requiring very high availability
raID l m
evel IGratIon
The term "Migration" means either or both of the following:
• Change the RAID level of a logical drive.
• Expand the storage capacity of a logical drive.
189
No. of
No. of Axles Drives per Axle
Drives
17 2 8,9
3 5,6,6
4 4,4,4,5
18 2 9,9
3 6,6,6
4 4,4,5,5
19 2 9,10
3 6,6,7
4 4,5,5,5
20 2 10,10
3 6,7,7
4 5,5,5,5
5 4,4,4,4,4
Disadvantages
• High disk overhead – equivalent of two drives used for parity
• Slightly lower performance than RAID 50
On ASUS DS300f G2, RAID level migration is performed on the disk array but it applies to the logical drives.
Migration does not disturb your data. You can access the data while the migration is in progress. When migration
is done, your disk array has a different RAID level and/or a larger capacity.
M r
igrAtion equireMents
The following conditions affect RAID level migration:
• The disk array and logical drive must show a green check
• The Target disk array may require more physical drives than the Source disk array.
• If the Target disk array requires an EVEN number of physical drives but the Source disk array has an ODD
number, ADD a physical drive as part of the migration process.
• You cannot reduce the number of physical drives in your disk array, even if the Target disk array requires
fewer physical drives than the Source disk array.
• RAID 1 (mirroring) works with two drives only. Only a single-drive RAID 0 disk array can migrate to RAID
1. Other RAID Levels use too many drives to migrate.
• You cannot migrate a disk array when it is Critical or performing activities such as Synchronizing, Rebuilding,
and PDM.
• For RAID 6 or RAID 60, you can only migrate between these two RAID levels. Destination RAID 60 axles
can have up to 16 physical drives. Other limitations might apply.
s t rAid l
ource And Arget evels
The tables on the following pages show the migration options for each source logical drive by its RAID level.
The available target RAID levels are shown with their requirements.
rAid 0
A RAID 0 source logical drive can migrate to the following target logical drives:
Target Requirements
RAID 0 Add physical drives.
RAID 1 2 physical drives only.
Only a single-drive RAID 0 can migrate to RAID 1 by adding 1 physical
drive.
RAID 1E 3 or more physical drives.
If existing physical drives have no unused space, add 1 or more physical
drives.
DS300f G2 Series User Manual
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