Monday, 21 January 2019

Disk Sanitization Time?

There’s not much information out there regards disk sanitization time, so I thought I’d share my experience. I had the privilege to sanitize an old NetApp FAS2040A system running ONTAP 7.3.6 with 12 x 600GB 15k RPM SAS disk drives.

There are a couple of KBs on this:

And there is this communities post with useful information:

These were the timings for a (to DoD/Department of Defense standard) -

disk sanitize start -c 3 DISK

- on 600GB 15k RPM SAS disks.

TIME = 9 hours  4 minutes and 22 seconds

From the> rdfile /etc/log/messages

Wed Jan 16 12:32:05 GMT [disk.failmsg:error]: Disk 0c.00.3 (...): message received.
Wed Jan 16 12:32:05 GMT [raid.disk.unload.done:info]: Unload of Disk 0c.00.3 Shelf 0 Bay 3 [NETAPP   X290_S15K7560A15 NA00] S/N [...] has completed successfully
...
Wed Jan 16 21:36:27 GMT [disk.sanit.complete:info]: Disk 0c.00.3 [S/N ...] has completed sanitization.


According to the communities post link above, you can run sanitize on up to 100 disks at a time. You’ll have to run it two times at least, since the root disks also need to be sanitized (4a/reinitialize the system on different set of root disks.) For this system it took 3 visits to site to complete the work (alas, remote access was not possible):

Day 1: Re-initialize and sanitize spare disks (cannot do root disks).
Day 2: Re-initialize and sanitize disks we couldn’t do before.
Day 3: Final checks (“disk sanitize status”) to confirm all disks are wiped.

Image: Hard Disk