Ronnie Sahlberg ca1e152f2c New example file : ...

iscsi-dd can be used to copy the content of one iscsi lun onto a different
iscsi lun of the exact same sixe.

This example  illustrates how to "steal" a task structure from a callback
so we can use store it and have it remains valid after the read10 callback
has completed.
It also illustrates the async api of libiscsi for read10/write10.

Initially a number of read10 calls are made asynchronously until the
queue is full.
As each read10 completes and returns data, we issue a write10 to write
that data to the other lun.

As soon as a write10 completes, we "release" the initial read10 task corresponding to what we wrote and issue a new read10 to continue copying the next set of un-read data.

Using the async api, it should be easy to get very high performance and
throughput even from one single thread.

2011-01-23 18:35:58 +11:00

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