Basic Size When Stripe Depth Is Tuned (For Tpp Capacity) - Fujitsu ETERNUS DX60 S3 User Manual

Appendix F Basic Size and MWC Input Condition for RAID Groups
F.1 Basic Size for each RAID Group
RAID level
High Capacity
(RAID5)
*1: D: Data drives, M: Mirror drives, P: Parity drives
*2: Basic size when creating volumes.
The ETERNUS DX manages volumes in units of stripe size. If the volume size is not an exact multiple of the basic size
(stripe size), then when a RAID group is created the remainder at the end of the last stripe used will be lost. Stripe
size is independent of the disk drive capacity.
multiple of the basic size and what happens when it is not.
F.1.5

Basic Size When Stripe Depth is Tuned (For TPP Capacity)

When Stripe Depth is tuned for RAID groups that are used as TPPs, the basic size that can be used for the TPPs
may increase. The following table shows RAID group configurations in which the basic size is different from
the normal size.
Basic size
42 MB
84 MB
168 MB
If the TPP capacity is not an exact multiple of the basic size, areas that cannot be used as TPPs are created in
the RAID group.
Drive
configuration
(*1)
128KB
8D+1P 2 x Number of
concatenations
9D+1P 9 x Number of
concatenations
10D+1P 5 x Number of
concatenations
11D+1P 11 x Number of
concatenations
12D+1P 3 x Number of
concatenations
13D+1P 13 x Number of
concatenations
14D+1P 7 x Number of
concatenations
15D+1P 15 x Number of
concatenations
Stripe Depth
256 KB
512 KB
512 KB
1024 KB
1024 KB
1065
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Copyright 2015 FUJITSU LIMITED
Basic size (MB)
(Lowest exact MB multiple) (*2)
When the Stripe Depth is ...
256KB
2 x Number of
concatenations
–
–
–
–
–
–
–
Figure F.1 shows what happens when the volume size is an integral
RAID group configuration
RAID1+0 (8+8)
RAID0 (4D), RAID1+0 (4+4), RAID1+0 (12+12)
RAID1+0 (8+8), RAID1+0 (12+12)
RAID0 (4D), RAID1+0 (4+4), RAID1+0 (12+12)
RAID1+0 (8+8)
512KB 1024KB
– –
– –
– –
– –
– –
– –
– –
– –
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