Dm-crypt freezing computer?

[Michael Butash]

I've been using dm-crypt most of the 15 years I use linux, never seen it
just hang like that...  Is this a spinner or SSD?  I'm thinking physical
errors perhaps - have you looked at SMART data on the disk to check its
health?  I'm thinking it's having a problem with a bad sector, but these
tend to manifest different ways between spinners and ssd.

If SSD, make sure your firmware is updated, as these drives seem to be
constantly updated for weirdness.  Older SSD's would start getting wonky,
then just die one day, usually due to wear.  Use of trim is useless with
encryption (and a security problem), so I always use Samsung SSD's that do
automatic wear-leveling, and haven't lost a ssd since or have had any
disk-based weirdness in general in a while.

-mb


On Thu, Jun 25, 2020 at 2:51 PM Seabass via PLUG-discuss <
plug-discuss at lists.phxlinux.org> wrote:

> I am extracting from a large tar file, and at around the 2nd gig, my
> computer starts to slow and even freeze up a bit. Mouse always moves fine,
> but that’s about it.
>
> iotop reports dm-crypt is the only thing and is using 99% of my read/write.
> htop shows minimal processing being used and ram isn’t full...
>
> So... can dm-crypt as full disk encryption slow the computer to almost
> freezing?
>
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