Querying, quiescing, and querying

Complete this task series to query for the first pass of the out-of-sync bitmap completion, to quiesce your system, and to complete the query process to ensure that the out-of-sync tracks equal 0. This series of tasks is the third step in the failback recovery process that allows production to be returned to your A site.

To perform this series of tasks, you must ensure that you have resynchronized the volumes, B volumes to A volumes.

This series of tasks requires the use of the lspprc command and that you quiesce your system.

Perform the following steps to complete the third step of the failback recovery process. The example commands in this task are shown in two formats. The first format shows the type of information that the command requires. The second format provides the command with declared values for the variables.

Issue the lspprc command periodically to identify when the first pass of the out-of-sync (OOS) bitmap completes. Depending on the number of transactions that you have, some period of time elapses. Enter the lspprc command at the dscli command prompt with the following parameters and variables:
dscli>lspprc -dev storage_image_ID -remotedev storage_image_ID -l SourceVolumeID:TargetVolumeID

Example
```
dscli>lspprc -dev IBM.1750–68FA150 -remotedev IBM.1750–68FA120
1000:1000
```
Notes:
1. The -dev parameter specifies the ID of your source storage unit. At this point, your source is the Site B storage unit.
2. The -remotedev parameter specifies the ID of the target storage unit. At this point, the remote storage unit is your Site A storage unit.
3. The source_volume_ID:target_volume_ID value has the Site B volume ID as the source and the Site A volume ID as the target.
Quiesce your I/O and unmount your file systems at the B site to preserve the integrity of your file system.
Note: Unmounting your file systems flushes the host cache and ensures that you actually copy valid data sets.
Reissue the lspprc command periodically to identify when the remaining bits completely drain from the B site. This is indicated when the out-of-sync (OOS) tracks equal zero. Depending on the number of transactions that you have, some period of time elapses. Enter the lspprc command at the dscli command prompt with the following parameters and variables:
dscli>lspprc -dev storage_image_ID -remotedev storage_image_ID -l SourceVolumeID:TargetVolumeID

Example
```
dscli>lspprc -dev IBM.1750–75FA150 -remotedev IBM.1750–75FA120
1000:1000
```

After this task is completed, you are ready to establish the remote mirror and copy paths from Site A to Site B.