IOCELL Networks 351UNE Manual de usuario descargar pdf (Pagina 52)

IOCELL Networks NetDISK User Manual Network Direct Attached Storage / NDAS

7.10 NDAS Bind Terms

Degraded mode

Even if one NDAS device fails while accessing the Mirror (RAID1) bind, you can still

access the data. Redundancy is not available in this state and it is called degraded

mode. If another NDAS device fails in this mode, Mirror (RAID1) become unusable. So

you need to replace the defective device as soon as possible.

Spare disk

A spare disk automatically replaces a failed member if the Mirror (RAID1) enters

degraded mode. The spare disk will become an active member of the RAID and the bind

will begin synchronizing. If you notice a member has been marked defective or missing,

right click it and choose configure RAID without this device. Then replace the failed unit

or drive and add it again as a spare to the resynchronized mirror. Even if a spare disk is

used, the RAID will mount in degraded mode during resynchronization.

Irreconcilable state

When each member of Mirror (RAID1) is used in degraded mode independently, the

data on the devices may become different from each other. If both copies are valid data,

it will not be able to resolve the differences automatically. A user needs to solve this

case by replacing one of the disks or unbinding the Mirror to use the drives separately.

Resynchronization

When using a Mirror (RAID1), the same data is written to each member device. If one of

the devices becomes unavailable for some time or if a device is added later to the bind,

both devices won't have the same data. So the Mirror (RAID1) system will need to copy

data from one device to the other and this process is called resynchronization.

Out-of-sync

When one member of a Mirror (RAID1) is not identical to another member and may have

not valid data.

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IOCELL Networks 351UNE Manual de usuario Pagina 52