Re: Debugging system freezes on filesystem writes

[Marcus Sundman]

On 12.09.2013 23:46, Jan Kara wrote:
> On Thu 12-09-13 20:59:07, Marcus Sundman wrote:
> > On 12.09.2013 19:35, Jan Kara wrote:
> > > On Thu 12-09-13 18:08:13, Marcus Sundman wrote:
> > > > And can I somehow "reset" whatever it is that is making it worse so
> > > > that it becomes good again? That way I could spend maybe 1 hour once
> > > > every few months to get it back to top speed.
> > > > Any other ideas how I could make this (very expensive and fairly new
> > > > ZenBook) laptop usable?
> > >    Well, I believe if you used like 70% or less of the disk and regularly
> > > (like once in a few days) run fstrim command, I belive the disk performance
> > > should stay at a usable level.
> > At 128 GB it is extremely small as it is, and I'm really struggling
> > to fit all on it. Most of my stuff is on my NAS (which has almost 10
> > TB space), but still I need several code repositories and the
> > development environment and a virtual machine etc on this tiny 128
> > GB thing.
>    I see. I have like 70 GB disk and 50% of it are free :) But I have test
> machines with much larger drives where I have VMs etc. This one is just
> for email and coding.
>
> > So, if I used some other filesystem, might that allow me to use a
> > larger portion of the SSD without this degradation? Or with a much
> > slower rate of degradation?
>    You might try f2fs. That is designed for low end flash storage so it
> might work better than ext4. But it is a new filesystem so backup often.
>
> > And at some point it will become unusable again, so what can I do
> > then? If I move everything to my NAS (and maybe even re-create the
> > filesystem?) and move everything back, might that get rid of the FTL
> > fragmentation?
>    Yes, that should get rid of it. But since you have only a few GB free,
> I'm afraid the fragmentation will reappear pretty quickly. But I guess it's
> worth a try.
>
> > Or could I somehow defragment the FTL without moving away everything?
>    I don't know about such way.

How about triggering the garbage collection on the drive, is that possible?


- Marcus

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