The following table shows the maximum number and the maximum capacity of TPPs that can be registered in
the ETERNUS AF.
Table 14 TPP Maximum Number and Capacity
Item ETERNUS AF250 S2/AF250
Number of pools (max.) 24 (*1)
Pool capacity (max.) 2,048TB (*2)
*1: The maximum total number of Thin Provisioning Pools and FTSPs.
*2: The maximum pool capacity is the capacity that combines the FTSP capacity and the Thin Provisioning
Pool capacity in the
ETERNUS AF.
The following table shows the TPP chunk size that is applied when TPPs are created.
Table 15 Chunk Size According to the Configured TPP Capacity
Setting value of the maximum pool capacity Chunk size (*1)
Up to 256TB 21MB
Up to 512TB 42MB
Up to 1,024TB 84MB
Up to 2,048TB 168MB
*1: Chunk size is for delimiting data. The chunk size is automatically set according to the maximum pool ca-
pacity.
To perform encryption, specify encryption by firmware when creating a TPP, or select the Self Encrypting Drive
(SED) for configuration when creating a TPP.
The following table shows the RAID configurations that can be registered in a TPP.
Table 16 Levels and Configurations for a RAID Group That Can Be Registered in a TPP
RAID level Number of configurable drives
Recommended config-
urations
RAID0 4 (4D) —
RAID1 2 (1D+1M) —
RAID1+0 4 (2D+2M), 8 (4D+4M), 16 (8D+8M), 24 (12D+12M) 8 (4D+4M)
RAID5 4 (3D+1P), 5 (4D+1P), 7 (6D+1P), 8 (7D+1P), 9 (8D+1P), 13 (12D+1P) 5 (4D+1P), 8 (7D+1P)
RAID6 6 (4D+2P), 8 (6D+2P), 9 (7D+2P), 10 (8D+2P) 8 (6D+2P)
RAID6-FR
13 ((4D+2P) ´2+1HS), 17 ((6D+2P) ´2+1HS) 17 ((6D+2P) ´2+1HS)
•
Thin Provisioning Volume (TPV)
The maximum capacity of a TPV is 128TB. Note that the total TPV capacity must be smaller than the maximum
capacity of the TPP.
When creating a TPV, the Allocation method can be selected.
-
Thin
When data is written from the host to a TPV, a physical area is allocated to the created virtual volume. The
capacity size (chunk size) that is applied is the same value as the chunk size of the TPP where the TPV is
created. The physical storage capacity can be reduced by allocating a virtualized storage capacity.
-
Thick
When creating a volume, the physical area is allocated to the entire volume area. This can be used for vol-
umes in the system area to prevent a system stoppage due to a pool capacity shortage during operations.
In general, selecting "Thin" is recommended. The Allocation method can be changed after a TPV is created.
1. Function
Operations Optimization (Deduplication/Compression and Storage Virtualization)
47
FUJITSU Storage ETERNUS AF250 S2, ETERNUS AF250 All-Flash Arrays
Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
P3AG-1822-09ENZ0
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