Mick <michaelkintz...@gmail.com> wrote: > On Tuesday 14 Feb 2017 01:51:01 wabe wrote: > > Mick <michaelkintz...@gmail.com> wrote: > > > > Have you noticed a difference between mounting partitions on them > > > with the discard option, Vs running fstrim on a cron job? > > > > I noticed a big performance impact with my old Corsair 60GB SSD > > (Force3 IIRC) when I used the discard option in fstab. So I decided > > to use the fstrim command instead, before I did my weekly backups. > > The fstrim command always needed about 10 minutes or so to complete > > its job. > > > > About 1 year ago I replaced the Corsair with a Samsung SSD 850 PRO. > > With this device I did not notice a performance impact when the > > discard option is enabled and so I decided to use it. > > Btw: On the Samsung SSDs the fstrim command only needs a second or > > so to do its job. > > > > I never used a benchmark program to check if there is really no > > difference. But at least I don't notice any in my every day use. > > > > My old Corsair SSD (bought it in 2011) is still in use as swap > > space device in my Win7 machine (together with a SSD 850 PRO as > > system device). Before that, I used it as system disk on my gentoo > > machine. I also used it for my users mail and thumbnail directories > > and also for /log, /tmp, /var and the whole portage tree. Before > > I upgraded my gentoo machine to 16GB RAM I also used the SSD for > > portages temporary files. So it was really in heavy use. And is > > still running without problems. > > Before I installed the Corsair SSD into my Win machine, I used > > fstrim to increase the reserved space to 50%. I hope that it will > > run for at least another 6 years. ;-) > > > > -- > > Regards > > wabe > > Thanks wabe, this is really interesting. I was using discard and > can't say I noticed any performance penalty on the OCZ drive. I > removed it and set up a fstrim cron job and suddenly there is a major > I/O bottleneck when the cron job runs. Perhaps I should be running > it more often ...
I only used fstrim in single user mode before I made my weekly backup. I can imagine that it will cause a I/O bottleneck while it runs. P.S.: I wrote by mistake, that I used fstrim to reserve free space on the drives. Actually I used hdparm for that. -- Regards wabe
