This subsection describes the modes for online backup and instant restore of local volumes and shared volumes through use of snapshots by GDS Snapshot proxy volumes.
There are two online backup methods: one uses the function as "1.5.1 Snapshot by Synchronization" and the other uses the function as "1.5.3 Instant Snapshot by OPC."
By cooperation with the following functions, backup and restore processing that do not impose the load on the server or SAN become possible.
Advanced Copy function of ETERNUS Disk storage system
EC (including REC) or OPC (including QuickOPC)
Copy function of Dell EMC storage units (not supported in this version)
Dell EMC TimeFinder or Dell EMC SRDF
The following table shows backup and restore methods and their features.
Operation | Disk Unit's Copy Function | Master Configuration (*2) | Proxy Configuration (*2) | Feature |
|---|
Backup(Sync) | - | single
mirror
mirror + stripe
mirror + concat | single
mirror
mirror + stripe
mirror + concat | With synchronized masters and proxies, snapshots are created simply by parting the proxies.
By use of the JRM for proxies, high-speed resynchronization is executable for snapshot re-creation.
Striping and concatenating masters are possible.
Mirroring, striping and concatenating proxies are possible.
|
EC REC TimeFinder (*1) SRDF (*1) | single
mirror | single | With synchronized masters and proxies, snapshots are created simply by parting the proxies.
By use of a disk unit's copy function, snapshot creation that does not impose the load on the server or SAN is possible.
By use of a disk unit's incremental copy function, high-speed resynchronization that does not impose the load on the server or the SAN is performed for snapshot re-creation.
|
OPC QuickOPC | single
mirror | single | With synchronized masters and proxies, snapshots are created simply by parting the proxies.
By use of a disk unit's copy function, snapshot creation that does not impose the load on the server or SAN is possible.
|
Backup(OPC) | OPC QuickOPC | single
mirror | single | There is no need to synchronize masters and proxies before creating snapshots, and backups can be created any time without scheduling in advance.
By use of a disk unit's copy function, snapshot creation that does not impose the load on the server or SAN is possible.
|
Restore | - | single
mirror
mirror + stripe
mirror + concat | single
mirror
mirror + stripe
mirror + concat | By use of the JRM for proxies, high-speed restore is possible.
Striping and concatenating masters are possible.
Striping and concatenating proxies are possible.
|
OPC QuickOPC | single
mirror | single
mirror | |
(*1) Not supported in this version
(*2) In the table above, configurations indicate objects as follows.
Configuration | Description |
|---|
single | This configuration means any one of the following objects. A single volume created in a single disk
A mirror group not hierarchized, with the multiplicity of one
A volume created in a mirror group not hierarchized, with the multiplicity of one
|
mirror | This configuration means either the following objects. A mirror group not hierarchized, with the multiplicity of two and higher
A mirror volume created in a mirror group not hierarchized, with the multiplicity of two and higher
|
mirror + stripe | This configuration means either the following objects. |
mirror + concat | This configuration means either the following objects. |
For details on backup and restore by cooperation with copy functions of disk units (EC, OPC, TimeFinder, SRDF), see "1.5.2 Snapshot Function with No Load to Server/SAN," "A.8 Using Advanced Copy Function in Proxy Configuration," "3.18 Instant Snapshot by OPC" and "3.19 Using Dell EMC TimeFinder or Dell EMC SRDF in Proxy Configuration."
