| You don't mention your firmware version. Is it V27Z? If batteries are
low and Cache Policy is B, the mirrorsets,raidsets, jbods... operate in
write through mode. Batteries are only low upon controller power up. If
the batteries do not charge fully within 10 hours (I think it is 10
hours) the batteries transition to a Bad state. Depending on the
firmware you have, that may cause Raid and Mirrorsets to become
unavailable to the os.
Mark d.
|
| Another shot at the same answers. my comments by the >>>
1. If the battery is "low" and the cache policy is set as B, please
confirm that the controller will automatically go to write through cach
mode.
>>> Low conditions can only exist in the first ten hours after the controller
>>> is booted. If this condition exists and cache policy B is selected,
>>> access to RAID and Mirror sets will be allowed through the write back
cache.
2. If the battery is "bad", the manual indicates that raid sets /
mirrored sets will be inoperative - is this true?
>>> With UNIX and HSOF V2.7, access to RAID and mirror sets is denied. With
>>> VMS and 2.7, device failover to the redundnant pair of the controller
>>> should occur. With UNIX and 3.0, the battery failure should cause the
>>> controller to shut itself down, initiating failover of the devices to the
>>> good controller in the pair, assuming that there is one. If no
>>> operational member is available to failover to, or if this is a single
>>> controller, access to RAID and Mirror sets will be denied and access to
>>> JBOD will be permitted.
3. Ken has a redundant controller setup. In the case of a bad or low
battery condition on one controller, will it not failover to the second
controller so he doesn't need to be concerned about bad or low
batteries?
>>> See 2 above.
|