Specifying snapshot types through options
You use the
XBM
ISPF interface to perform these functions. With SSI options, you can specify whether to allow Instant Snapshots or hardware snapshots.
For hardware snapshots, you can also specify whether to allow data-set-level snapshots, as well as whether to allow XBM to split a currently established mirror if the data-set-level snapshot cannot be performed.
The following table describes the options that you set to control the type of snapshot that is performed. For more information about these options, see Performing-hardware-snapshots or Performing-Instant-Snapshots.
Controlling the snapshot types
Control mechanism | Instant 1 | Hardware | Software only 2 | |
|---|---|---|---|---|
Data set snap | Volume split | |||
SSI Options | ||||
Allow Instant Snapshots | Y | Not applicable | Not applicable | Not applicable |
Allow SSI assisted snapshots | Not applicable | Y | Y | N |
Allow data set snap 3 | Not applicable | Y | N | Not applicable |
-- SMS options | Not applicable | Optional | Not applicable | Not applicable |
Allow volume mirror split 3 | Not applicable | Not applicable | Y | Not applicable |
-- Remote mirror options | Not applicable | Not applicable | Optional | Not applicable |
Snapshot Template | ||||
Allow SSI assisted snapshots | Not applicable | Y | Y | N |
- The utility keyword DSSNAP is the only requirement for Instant Snapshots unless you want to enable fallback.
- BMC recommends that you enable software snapshots so that XBM can fallback to a software snapshot if the hardware snapshot process fails for any reason. If you are not going to perform hardware or Instant Snapshots, you can either turn off hardware and Instant Snapshots through the SSI options (as described here) or you can disable the SSI component in your XBM PROC task (as described in Starting-the-ISPF-interface). If you are not going to use hardware devices, BMC recommends disabling the SSI component in the PROC to eliminate the device discovery phase and reduce start-up time for the XBM subsystem.
- If you enter Yes for both the data set snap and volume mirror split values in the SSI options, XBM first attempts to use the data set snap method and, if unsuccessful for any reason, then attempts the volume split.