User Data Area Of Cache Memory - Hitachi AMS2100 User Manual
Ams 2000 family copy-on-write snapshot
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Also See for AMS2100:
- Getting started manual (54 pages) ,
- Hardware manual (306 pages) ,
- Service manual (192 pages)
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Table 2-5: DP Pool Statuses and Availability of SnapShot Pair Operation
Pair Operation
Split pair
0
Resync pair
0
Restore pair
0
Delete pair
0
NOTE:
formatting operates for the DP pool. If pair creation, pair resynchronization,
or restoration is performed during the formatting, depletion of the usable
capacity may occur. Since the formatting progress is displayed when
checking the DP pool status, check if the sufficient usable capacity is
secured according to the formatting progress, and then start the operation.
User data area of cache memory
Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide
DP Pool Statuses, DP Pool Capacity Statuses, and DP Pool Optimization
Capacity in
Normal
Growth
0
0
0
0
When the DP pool was created or the capacity was added, the
•
Operation of the DP-VOL during SnapShot use
When using the DP-VOL created by Dynamic Provisioning for a P-
VOL or a data pool of SnapShot, any of the operations among the
capacity growing, capacity shrinking, LU deletion, and Full
Capacity Mode changing of the DP-VOL in use cannot be
executed. To execute the operation, delete SnapShot pair of
which the DP-VOL to be operated is in use, and then execute it
again.
•
Operation of the DP pool during SnapShot use
When using the DP-VOL created by Dynamic Provisioning for a P-
VOL or a data pool of SnapShot, the DP pool to which the DP-VOL
in use belongs cannot be deleted. To execute the operation,
delete the SnapShot pair of which the DP-VOL is in use belonging
to the DP pool to be operated, and then execute it again. The
attribute edit and capacity addition of the DP pool can be
executed usually regardless of the SnapShot pair.
•
Cascade connection
A cascade can be performed on the same conditions as the
normal LU (refer to
TrueCopy on page
array including the DP-VOL needs to be 0893/A or more.
If SnapShot is used to secure a part of the cache memory, the user
data area of the cache memory decreases. Also, by using TCE and
Dynamic Provisioning together, the user data area may further
decrease.
Table 2-6
Planning and design
Statuses
Capacity
Regressed
Depletion
x
0
x
0
x
0
0
0
Cascade connection of SnapShot with
1-12). However, the firmware version of the
to
Table 2-13
show the cache memory secured
DP in
Blocked
Optimization
x
0
x
0
x
0
0
0
2-21
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