Hitachi AMS 2000 User Manual page 96

Table 5-2: TCE Specifications (Continued)
Parameter
TCE use with Data
Retention Utility
TCE use with Cache
Residency Manager
TCE use with Cache
Partition Manager
TCE use with SNMP Agent
TCE use with Volume
Migration
TCE use with Power
Saving
Reduction of memory
Load balancing
LU assigned to data pool
Extension of influence of
the TCE function
installation
Remote Copy over iSCSI
in the WAN environment
5–6
Hitachi AMS 2000 Family TrueCopy Extended Distance User Guide
Allowed.
• When S-VOL Disable is set for an LU, a pair cannot be created
using the LU as the S-VOL.
• S-VOL Disable can be set for an LU that is currently an S-VOL, if
pair status is Split.
Allowed. However, an LU specified by Cache Residency Manager cannot
be used as a P-VOL, S-VOL, or data pool.
• TCE can be used together with Cache Partition Manager.
• Make the segment size of LUs to be used as a TCE data pool no
larger than the default, (16 KB).
• See Appendix D, Installing TCE when Cache Partition Manager is in
use for details on initialization.
Allowed. A trap is transmitted for the following:
• Remote path failure.
• Threshold value of the data pool is exceeded.
• Actual cycle time exceeds the default or user-specified value.
• Pair status changes to:
- Pool Full
- Failure.
- Inconsistent because the data pool is full or because of a
failure.
Allowed. However, a Volume Migration P-VOL, S-VOL, or Reserved LU
cannot be used as a TCE P-VOL or S-VOL.
Allowed, however, pair operations are limited to split and delete.
The memory cannot be reduced when the ShadowImage, SnapShot,
TCE, or Volume Migration function is validated. Make the reduction after
invalidating the function.
Not supported.
An LU consisting of a SAS, SSD drives, and an LU with a SATA drive
cannot coexist in a data pool. Set all the LUs configured with the same
drive type.
When the firmware version of the array is less than 0897/A, you must
restart the array to ensure the data pool resource. However, the restart
is not required when the data pool is already used by SnapShot because
TCE and SnapShot share the data pool.
We recommend using TrueCopy in the WAN environment of MTU1500
or more. However, if TCE needs to be implemented in the WAN
environment of less than MTU1500, change the maximum segment size
(MSS) of the WAN router to a value less than 1500, and then create a
remote path. The data length transmitted from TCE of HUS100 changes
to the specified value less than 1500.
When creating a remote path without changing the MSS value or not
creating the remote path after changing the MSS value again, a data
transfer error occurs because TCE of HUS100 transmits the MTU1500
data. To change the MSS value, request the customer or the WAN
router provider.
Requirements and specifications
TCE Specification