Fujitsu ETERNUS DX100 S4 Design Manual page 28

2. Basic Functions
RAID Functions
Type
Wide Striping Volume (WSV)
ODX Buffer volume
*1 : When multiple volumes are concatenated using the LUN Concatenation function, the maxi-
mum capacity is also 128TB.
*2: The capacity differs depending on the copy source volume capacity.
After a volume is created, formatting automatically starts. A server can access the volume while it is
being formatted. Wait for the format to complete if high performance access is required for the
volume.
• In the ETERNUS DX, volumes have different stripe sizes that depend on the RAID level and the
stripe depth parameter.
For details about the stripe sizes for each RAID level and the stripe depth parameter values,
refer to "ETERNUS Web GUI User's Guide".
Note that the available user capacity can be fully utilized if an exact multiple of the stripe size is
set for the volume size. If an exact multiple of the stripe size is not set for the volume size, the
capacity is not fully utilized and some areas remain unused.
• When a Thin Provisioning Pool (TPP) is created, a control volume is created for each RAID
group that configures the relevant TPP. Therefore, the maximum number of volumes that can
be created in the ETERNUS DX decreases by the number of RAID groups that configure a TPP.
• When the Flexible Tier function is enabled, 32 work volumes are created. The maximum num-
ber of volumes that can be created in the ETERNUS DX decreases by the number of work vol-
umes that are created.
• When a Flexible Tier Sub Pool (FTSP) is created, a control volume is created for each RAID
group that configures the relevant FTSP. Therefore, the maximum number of volumes that can
be created in the ETERNUS DX decreases by the number of RAID groups that configure an
FTSP.
When using the VVOL function, a single volume for the VVOL management information is cre-
•
ated the moment a VVOL is created. The maximum number of volumes that can be created in
the ETERNUS DX decreases by the number of volumes for the VVOL management information
that are created.
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
Usage
This volume is created by concatenating distributed
areas in from 2 to 64 RAID groups. Processing speed is
fast because data access is distributed.
An ODX Buffer volume is a dedicated volume that is
required to use the Offloaded Data Transfer (ODX)
function of Windows Server 2012 or later. It is used to
save the source data when data is updated while a
copy is being processed.
It can be created one per ETERNUS DX.
Its volume type is Standard, TPV, or FTV.
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Copyright 2023 Fujitsu Limited
Maximum capacity
128TB
1TB
P3AM-7642-32ENZ0