Hp XP RAID Manager Software Manual de usuario descargar pdf (Pagina 146)

A V-VOL has the following characteristics:

• It appears as "OPEN-0V" to identify a V-VOL easily via the SCSI Inquiry or RAID Manager.

• A V-VOL unmapped to the S-VOL of a Fast Snap or Snapshot will reply to a SCSI Inquiry, but

Reading and/or Writing is not allowed. LDEV will reply the capacity setting as an LU to SCSI

Read Capacity.

• A V-VOL that has become the S-VOL of a Fast Snap or Snapshot will reply to a SCSI Inquiry,

and Reading and/or Writing is allowed.

Snapshot pair status

Each paired volume consists of a primary volume (P-VOL) and a secondary volume (S-VOL). Each

volume has the status for controlling the pair state.

The P-VOL controls the pair state that is reflected on the status of the S-VOL. The major pair statuses

are “SMPL”, “PAIR”, “PSUS”, “COPY”, and “RCPY”. The status is changed when the RAID Manager

command is issued. A read or write request from the host is allowed or rejected according to the

status.

Table 34 Snapshot Pairing Status

SecondaryPrimaryPairing StatusP-VOL Status

R/W disableR/W enabledUnpaired (Snapshot) volumeSMPL

(

)

R/W disableR/W enabledThe Snapshot available state allocated the resource.PAIR (PFUL)

R/W disableR/W enabledThe preparing state allocates the resource for the

Snapshot.

COPY

R/W disableR/W disableThe copying state from Snapshot to the primary volume

by using restore option.

RCPY

R/W enabledR/W enabledThe differences of the updated data of the primary and

secondary volume are controlled with copying on write.

PSUS (PFUS)

R/W disableR/W enabled (

)“PSUS” status owing to an internal failure. The

differences of the updated data for the Snapshot volume

are not controlled.

PSUE (Error)

NOTE:

V-VOL unmapped to the S-VOL of a Fast Snap or Snapshot will reply to a SCSI Inquiry,

but Reading and/or Writing is not allowed.

Reading and writing are enabled, as long as no failure occurs in the primary volume.

Pair status relationship to Snapshot commands

Table 35 (page 147) applies to a Fast Snap or Snapshot context. It explains 1) what a pair status

may be prior to any RAID Manager command execution, 2) what the result would be after giving

a RAID Manager command, and 3) what the pair status may be if the RAID Manager command

is Accepted.

146 Data replication operations with RAID Manager

1 2 ... 141 142 143 144 145 146 147 148 149 150 151 ... 273 274

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