[CentOS] issue_discards in lvm.conf

Thu Jun 12 17:21:43 UTC 2014
John R Pierce <pierce at hogranch.com>

On 6/12/2014 10:12 AM, m.roth at 5-cent.us wrote:
> We use two methods: for the drives that are totally dead, or*sigh*  the
> SCSI drives, they get deGaussed. For SATA that's still running, we use
> DBAN.*Great*  software. From what I've read, one pass would probably be
> good enough, given how data's written these days. With my name certifying
> it, I do paranoid, and tell DBAN the full 7-pass, DoD 5220.22-M. I
> *really*  don't think anyone's getting anything off that.

if the drive has remapped tracks, there's stale data on there you can't 
erase with DBAN.

> We don't have any SSDs, so I can't speak to that. Bet you could deGauss
> them, easily enough. Or maybe stick 'em on a burner on a stove to get over
> the Curie point....*

degaussing would do nothing to flash memory, its semiconductor, not 

john r pierce                                      37N 122W
somewhere on the middle of the left coast