Table 32 System option modes
Mode Category Description Default MCU/RCU
15 Common This mode can reduce the host response time from 15
seconds to 6 seconds or less.
Notes:
1. This mode is used on a storage system where slow or
delayed drive response may affect business
operations.
2. When Dynamic Sparing or Auto Correction Mode is
used, I/O watching time is 30 sec even when the
mode is set to ON. This is because host I/Os conflict
with copy processing,
3. Do not use this mode when SATA HDDs are used in
VSP G1000 and VSP G1500 systems.
4. When SOM771 or SOM797 supported by RAID600,
HM700, and later models is set to ON, the setting of
SOM771/797 is prioritized for the read I/O watching
time.
5. For relations with other system option modes, see
the SOM 015 sheet.
6. When this mode is applied, SOM142 is disabled.
OFF -
20 Public
(Optional)
R-VOL read only function. OFF MCU
22 Common Regarding the correction copy or the drive copy, in case
ECCs/LRC PINs are set on the track of copy source HDD,
mode 22 can be used to interrupt the copy processing
(default) or to create ECCs/LRC PINs on the track of copy
target HDD to continue the processing.
Mode 22 = ON:
If ECCs/LRC PINs (up to 16
1
) have been set on the track of
copy source HDD, ECCs/LRC PINs (up to 16
1
) will be
created on the track of copy target HDD so that the copy
processing will continue.
If 17 or more ECCs/LRC PINs are created, the
corresponding copy processing will be interrupted.
Note: 1: The maximum number of ECCs/LRC
PINs is as follows. All versions: 64
Mode 22 = OFF (default)
If ECCs/LRC PINs have been set on the track of copy
source HDD, the copy processing will be interrupted. (first
recover ECCs/LRC PINs by using the PIN recovery flow, and
then perform the correction copy or the drive copy again).
One of the controlling option for correction/drive copy.
OFF
None
36 HRC Sets default function (CRIT=Y) option for SVP panel (HRC). OFF MCU
64 TrueCopy for
Mainframe
Mode 64 = ON:
System option modes 135
Hitachi Virtual Storage Platform G1000, G1500, and Virtual Storage Platform F1500 Hardware Guide
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