HP NetServer AA 4000 Administrator's Manual page 44

Chapter 2
State Description
Faulted Indicates a disk failed a read or write request after repeated retries. The disk is not available for
use by the CE operating system.
You can use Endurance Manager to re-enable a disk that has experienced unrecovered failures and
return it to service. You do not need to reboot the IOP to bring the disk back online. An ensuing
mirror copy to the disk may correct bad spots present on the failed disk. However, if the disk has
completely or substantially failed, it will continue to revert to the faulted state. In this case, you
should replace the disk.
A disk is also regarded as faulted if it failed during previous operation of its IOP. For example, if
a disk experienced read or write errors and was deemed to be faulted, then the faulted state would
remain across IOP reboots, even if you replaced the failed disk. In this case, you must explicitly
enable the disk to clear its faulted condition.
Disabled An administrator may disable a mirrored disk at any time. The mirrored disk remains disabled
until it is explicitly enabled. It is possible to delay or halt a mirror copy by disabling the target of
the copy.
Warning: Do not disable the source of a mirror copy or all usable (online) disks in a mirror
Mirrored Disks in the Server
Because disk remirroring ensures availability of data on the server, the disks in the server have
these characteristics:
• The target disk of a mirror copy cannot fully service CE requests until its mirror copy
completes.
• If the source disk of that mirror set becomes unavailable for any reason before the mirror
copy completes, the CEs no longer have access to that mirror set.
• If the CEs cannot access the CEs' boot disks, the CEs reset.
If a mirrored disk fails, use Endurance Manager to attempt to enable that disk. If enabling the
disk succeeds, a mirror copy is automatically queued.
28
Table 2-8 Mirrored Disk States (Continued)
set, because this would make the entire mirror set inaccessible.
If all members of a mirror set are inaccessible during CE boot time, Windows NT
does not recognize the mirror set even if the disks are later returned to an online
state. In this case, a full reboot of the CE is required to enable Windows NT to
recognize the mirror set.
HP NetServer AA Overview