HP 4400 Release Note page 5

Fixed an issue where a controller can terminate (termination code 42280102) during a restart
due to the receipt of an unknown completion message type.
Fixed a controller restart issue (code 0x0442011f) that could occur when unpresenting a LUN.
Fixed an issue where a rare condition during host port abort processing caused an item being
aborted to be processed twice, resulting in a controller termination (termination code
0x04d3011f).
Fixed an issue where multiple threads attempting to access a common mirroring structure could
result in a controller termination (termination code 0x0204010a).
Fixed an issue where a controller operation would terminate (termination code 0x036c01c8)
and wait for user intervention instead of logging an event and continuing to execute after
encountering an error during drive poll operations.
Fixed an issue where I/Os could get stuck on a pending queue during a host port logout cleanup
and cause the controller to experience a stalled state and eventually execute a Cell State Manager
(CSM) Reset termination (termination code 0x4238011f) to clear the stalled state.
Fixed an issue where controllers can experience a termination (termination code 0x0775011a)
when get_info commands are called on a snapshot that is in the first stage of deletion.
Fixed an issue that caused recursive terminations (termination code 0x020d0104) due to mirrored
cache inconsistency, which sometimes involved inoperative LUNs.
Fixed an issue where a rare condition during a controller replacement or shutdown could allow
the surviving controller to skip some virtual disk failover steps and encounter a Unit Stalled
Too Long or CSM Reset termination.
Fixed an issue where the controllers run out of buffer resources and terminate (termination code
0x02160102) when flooded with write commands after a LUN becomes inaccessible due to lost
cache data being acknowledged and cleared.
Fixed an issue where a controller can experience a processor exception termination when two
drive failures occur in a narrow window while executing a Vraid5 write with multiple failed drives.
Fixed an issue that can result in a recursive controller termination (termination code 0x071a0100)
or incomplete leveling activity under rare circumstances.
Fixed the cache prefetching algorithm to prevent multiple watchdog timer terminations
(0x0420011f, 0x04800106) from occurring.
Disks (disk groups, virtual disks)
This section describes issues affecting physical and virtual disks or disk groups, which can lead to a
range of behaviors including a loss of redundancy, performance impact, or data unavailability.
Added protection to prevent dual controller restarts when invalid mirror data is detected.
An issue was fixed when the mirror connection breaks during certain operations. An outstanding
proxy command to the other controller, targeting the unit being quiesced, made it possible to
encounter a deadlock condition leading to an inoperative or unresponsive state.
Improved data pre-fetch algorithm to address a problem where high I/O latencies result from
sequential read streams involving non-uniform transfer requests.
Fixed an issue which blocked I/O module status data from being reported during controller startup
logging.
Fixed an issue where the controller software did not handle Cache Data Lost (CDL) LUN failover
correctly when a device data lost (DDL) condition was resolved.
Fixed issue that allowed change tracking metadata to be set on four disks in a single disk enhanced
disk group, resulting in a false inoperative condition after a power failure.
Fixes 5