Re: fstrim and Luks / dm-raid
Hi.
On Sat, Oct 05, 2019 at 09:09:21PM +0200, Pascal Hambourg wrote:
> > > > It's safe only if your SSD firmware is sane and does not corrupt your
> > > > data while processing TRIM with NCQ enabled.
> > > > For instance, some noname Chinese SSD (ADATA, for instance) can corrupt
> > > > your filesystem in such circumstances, Samsung 850 PRO should not.
> > > > Manual fstrim invocation seems to be safe.
> > >
> > > Why should fstrim be safer that the discard mount option ? AFAIK they
> > > use the same TRIM command.
> >
> > The way I heard it, to trigger the corruption one should issue TRIM
> > asynchronously *and* utilize NCQ for it. fstrim is synchronous.
>
> Asynchronous and synchronous to what ?
To SSD's I/O queue.
Reco
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