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 <jdill...@redhat.com> wrote: > On Thu, Jul 13, 2017 at 8:57 AM, Irek Fasikhov <malm...@gmail.com> 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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