Re: Is TRIM or DISCARD needed for regular HDDs

[Ed Greshko]

On 23/11/2020 19:23, Sreyan Chakravarty wrote:
> On Mon, 23 Nov 2020, 3:07 pm Ed Greshko, <[e-mail] > wrote:
> Ahhh, never mind.  It may be useful/supported with thin LV.
>
>
>
> Can someone tell me why these commands are useful ?
>
> Does thin LVMs have problems deleting data?

No.  I think you need to check out https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/htm... to see the use cases
for thin-provisioned lvm storage.

What I see as a key phrase in that document is:

To make sure that all available space can be used, LVM supports data discard. This allows for re-use of the space that was formerly used by a discarded file or other block range.

And that would be when "fstrim" would be useful.

---
The key to getting good answers is to ask good questions.