Hitachi ShadowImage for z/OS user guide (HIT9503-96009, January 2008)

Table 6 Siz Options
Option Type
Features
Requirement
Swap & Freeze
Swap & Freeze op
tion
suppresses the
update
copy. For more
information,
see section “S
wap&Freeze
Option”onpag
e38.
You must change the storage
system setting to allow the quick
restore operation.
Host I/O Performance
Host I/O Performance option
suppresses the copy operations
by Siz. For more information, see
section “Host I/O Performance
Option”onpage39.
—
FCv2 Slower Copy1
FCv2 Slower Copy1 option
suppresses the copy operations
by FlashCopy Mirror V2, and
prioritize the host I/O operations.
For more information, see
section “FCv2 Slower Copy1
Option”onpage39.
You need to set FCv2 Slower
Copy2 option invalid.
FCv2 Sl
ower Copy2
FCv2 Slow
er Copy2 option
suppres
ses the copy operations by
FlashCo
pyMirror Version 2, and
priorit
ize the host I/O operations.
You can
suppress more copy
operat
ions of FlashCopy Mirror
V2 by us
ing this option than when
you us
eFCv2SlowerCopy1
optio
n. For more information,
see se
ction “FCv2 Slower Copy2
Opti
on”onpage40.
—
Swap & Freeze Option
The Swap & Freeze option allows the S-VOLs of a Siz pair to remain unchanged after the quick restore
operation. If the quick restore operation is performed on a Siz pair with the Swap & Freeze option, update
copy operations are suppressed, and thus are not performed for pairs in the duplex status after the quick
restore operation. If the quick restore operation is performed without the Swap & Freeze option, the S-VOL
and T-VOL are re-synchronized when update copy operations are performed for pairs in the duplex status.
NOTE:
Make sure that the Swap & Freeze option remains in effect until the pair status becomes
duplex after
thequickrestoreoperation. ThefollowingfigureshowsthestateoftheT-VOLafterthequickrestore
operationwithorwithouttheSwap&Freezeoption.
38
Overview of Hitachi ShadowImage for z/OS Operations