HP NetServer AA 4000 HP NetServer AA 6200 Solution Release 3.0 Administrator&a - Page 44

Chapter 2 HP NetServer AA Overview Table 2-8 Mirrored Disk States (Continued) State Faulted Disabled Description 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. 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 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. 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