Streaming recall mode
Streaming recall mode allows for an asynchronous recall of migrated files. The recalled portion of the file can be accessed while the file is recalled.
Note:
- Streaming recall mode is valid only for read-only operations on the file.
- Partial file recall mode takes precedence over streaming recall mode. If a file is smaller than the value of minpartialrecallsize or if the minpartialrecallsize option is set to 0, normal or streaming recall mode takes precedence.
You can use the following methods to specify which files are recalled with streaming recall mode:
- Set the recallmode option of the dsmattr command to s (streaming). This
option specifies that you want to enable an asynchronous recall of
migrated files. Use this method to change the recall mode of migrated files that you typically read but that you do not modify. Streaming recall mode remains associated with the files until you do any of the following actions:
- Change the recall mode
- Modify the file
- Recall the file selectively
- Restore the file
- Set the minstreamfilesize option of the dsmmigfs add or dsmmigfs update command to specify a number to enable or disable an asynchronous recall of migrated files.
A larger value of the streamseq option of the dsmmigfs add or dsmmigfs update command increases the performance of streaming recall.
The readeventtimeout option of the dsmmigfs add or dsmmigfs update command sets the time before a streaming recall process times out.
The readstartsrecall option of the dsmmigfs add or dsmmigfs update command specifies whether a recall operation starts immediately when an application reads the stub file.