Mode Category Description Default MCU/RCU
144 Common The drive whose command response time is
permanently delayed is block
ed. At the same time,
SSB=AE4A (total response time exceeds threshold) is
reported. In this case, cache can become overloaded
so that the storage system performance is degraded.
Mode 144 = ON (default*): Check if there is a
permanently delayed drive for each port, and block
the corresponding port at the î ´rst time when all of
the following conditions are met:
1. The total time for the drive to respond to 200
commands is 20 seconds or more.
2. The response time of the drive is two times or
more longer than the average response time of
the parity group (excluding the slow drive).
3. The drive is in one of the following statuses:
- Normal
- A source drive or a target drive (spare drive)
during drive copy.
- A target drive (not spare drive) during copy
back.
- A target drive (spare drive) during correction
copy.
Mode 144 = OFF: Checking for delayed drives is not
performed.
*The default setting for this SOM depends on the
microcode level:
â–
Default = 83-03-28 and later (within 83-03-2x
range), 83-04-03 and later
â–
Default = earlier than 83-03-28, earlier than
83-04-03 (within 83-04-0x range)
Note: If there are multiple response-delayed drives
in the same parity group, only the î ´rst one is
blocked.
ON -
System option modes
Appendix B: System option modes
System Administrator Guide for VSP Gx00 models and VSP Fx00 models 292
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