On 11/03/2013 08:39 PM, Qixiaozhen wrote:
In my opinion, we should rethink the way of wiping the data in the
volumes. Filling in the device with /dev/zero with “dd” command was the
most primitive method. The standard scsi command “write same” could be
taken into considered.
Once the LBA was provided and the command was sent to the SAN , the
storage device(SAN) could write the same-data into the LUN or volumes.
The “dd” operation can be offloaded to the storage array to execute.
This will offload the CPU on the compute nodes, but it still uses disk I/O.
Personally I like the elegance of giving each user a certain amount of
I/O and giving them the option of unsecure or secure deletion. If they
choose the secure deletion then that disk bandwidth comes out of their
quota and the volume size is still billed against them until it is done
being deleted.
By asking for the secure deletion they are essentially still making use
of those resources until the deletion is complete, so I think it's fair
that it count towards their quota/usage stats.
Chris
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