qemu-iotests/199: change discard patterns
iotest 199 works too long because of many discard operations. At the same time, postcopy period is very short, in spite of all these efforts. So, let's use less discards (and with more interesting patterns) to reduce test timing. In the next commit we'll increase postcopy period. Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: NAndrey Shinkevich <andrey.shinkevich@virtuozzo.com> Tested-by: NEric Blake <eblake@redhat.com> Message-Id: <20200727194236.19551-6-vsementsov@virtuozzo.com> Signed-off-by: NEric Blake <eblake@redhat.com>
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