Hello everyone,
I've pushed out another set of changes to the unstable trees, and these
include:
* RAID 1+0 support
mkfs.btrfs -d raid10 -m raid10 /dev/sd...
4 or more drives required.
* async work queues for checksumming writes
* Better back references in the multi-device data structs
The async work queues include code to checksum data pages without the FS mutex
held, greatly increasing streaming write throughput. On my 4 drive system, I
was getting around 120MB/s writes with checksumming on. Now I get 180MB/s,
which is disk speed.
The rest of the week will be spent doing hot add/remove of devices. Happy
testing ;)
-chris
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