On 12/26/2013 01:56 AM, cosmos cosmos wrote:
Hello.
My name is Rucia for Samsung SDS.
I had in truouble in volume deleting.
I am developing for supporting big data storage such as hadoop in lvm.
it use as a full disk io for deleting of cinder lvm volume because of dd
the high disk I/O affects the other hadoop instance on same host.
If using dd for deleting the volume, it takes too much time for
deleting of cinder lvm volume because of dd.
Cinder volume is 200GB for supporting hadoop master data.
When i delete cinder volume in using 'dd if=/dev/zero of $cinder-volume
count=1000000 bs=1M' it takes about 30 minutes.
While I think your ionice proposal makes some sense, I think it would be
better to avoid the cost of the volume wipe on deletion in the first place.
I read a proposal about using thinly-provisioned logical volumes as a
way around the cost of wiping the disks, since they zero-fill on demand
rather than incur the cost at deletion time.
Chris
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