HP StorageWorks 2/140 - Director Switch Release Note page 12

Important Information
Downgrading directly to a version prior to 04.00.00 from Version 05.02.00-13 is
not allowed. To downgrade to a version prior to 04.00.00, you must first
downgrade to Version 04.YY.ZZ.
Note:
Version 04.01.00.
Downgrading directly to a version prior to 02.00.00 from Version 04.YY.ZZ is not
allowed. To downgrade to a version prior to 02.00.00, you must first downgrade to
Version 02.YY.ZZ.
Firmware downgrades should not be performed using EWS and Microsoft®
Internet Explorer Version 5.00.3315.1000x. If this operation is performed, the
download operation may not complete and may eventually time-out, leaving the
switch with the previous version of firmware.
NVRAM Validation Errors
Firmware Version 05.02.00-13 contains an enhancement that eliminates outages
in certain types of NVRAM failures. In Version 05.01.00-24, when the NVRAM
validation routine detects an error in the configuration data, it faults the processor.
On director products this results in a failover to the redundant CTP card, with no
interruption of Fibre Channel service. On switch products with no redundant CTP,
the processor IPLs and resets the configuration to factory defaults.
Firmware Version 05.02.00-13 implements a new correction algorithm, that
allows the switch to automatically recover from errors detected during system
runtime. If an error is detected during the validation process, the firmware uses the
configuration data stored in DRAM to refresh NVRAM. When this occurs, the
processor does not fault, no IPL occurs, and an event is logged. Fibre Channel
operation is not impacted.
If a validation error is discovered on the same CTP twice during a one-hour period
on a director product, the CTP will fault and fail over to the backup. If multiple
errors within an hour occur on a switch product, the unit will fault and be reset to
factory defaults.
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The Director 2/140 and Edge Switch 2/24 cannot be downgraded below
Director Release Notes