Adding rbd readahead disable after bytes = 0 did not help.
--
[root@cephlarge mnt]# time qemu-img convert -p -O raw /mnt/data/workload_326e8a43-a90a-4fe9-8aab-6d33bcdf5a05/snapshot_9f0cee13-8200-4562-82ec-1fb9f234bcd8/vm_id_05e9534e-5c84-4487-9613-1e0e227e4c1a/vm_res_id_24291e4b-93d2-47ad-80a8-bf3c395319b9_vdb/66582225-6539-4e5e-9b7a-59aa16739df1 rbd:volumes/24291e4b-93d2-47ad-80a8-bf3c395319b9 (100.00/100%)
real 4858m13.822s
user 73m39.656s
sys 32m11.891s
It took 80 hours to complete.
Also, its not feasible to test this with huge 465GB file every time. So I tested qemu-img convert with a 20GB file.
| Parameters | Time taken |
| -t writeback | 38mins |
| -t none | 38 mins |
| -S 4k | 38 mins |
| With client options mentions by Irek Fasikhov | 40 mins |
The time taken is almost the same.
On Thu, Jul 13, 2017 at 6:40 PM, Jason Dillaman <jdillama@xxxxxxxxxx> wrote:
On Thu, Jul 13, 2017 at 8:57 AM, Irek Fasikhov <malmyzh@xxxxxxxxx> wrote:
> rbd readahead disable after bytes = 0
There isn't any reading from an RBD image in this example -- plus
readahead disables itself automatically after the first 50MBs of IO
(i.e. after the OS should have had enough time to start its own
readahead logic).
--
Jason
Regards,
mahesh j
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