Support tools for a thin lvhd implementation as described in the design doc.
To set up a test environment, run:
$ sudo ./setup.sh
This will
- create a sparse file to simulate a large LUN, using /dev/loop0
- formats the LUN for "XenVM": this is like LVM only with a built-in redo-log and operation journalling
- creates the metadata volumes for a single client host ("host1")
- creates 1000 LVs as a micro-benchmark
You can then query the state of the system with:
$ ./xenvm.native lvs
$ ./xenvm.native host-list
In another terminal start the local-allocator:
$ sudo ./local-allocator.native
This will take a few seconds to complete its handshake. You can then type in the
name of a dm-device to request more space. Type in djstest-live: you will see it
allocate from it local thin-pool, send the update to the master and update the local
device mapper device.
To shut everything down run
$ sudo ./clean.sh
Note that a clean shutdown requires local-allocators to be online and responding to the handshake.