On 02/07/2015 10:54 AM, Uwe Brauer wrote: > Hello > > > I tried to send this email via gmane, but I never saw it on that list, > so I resend it. > > > > Using a Thinkpad Laptop with a new Samsung ssd, I have installed kubuntu > 10.04 and chosen jfs. Since 10.04 is too old to support trimming, I > compiled and installed kernel 3.7 and complied fstrim. > > The relevant entry of my fstab reads as follows. > > > UUID=8e06979b-2dbf-4192-8513-957bafa74a1e / jfs > nodiratime,noatime,errors=remount-ro 0 > > The recommendation to use nodiratime and noatime for ssd I found > for example in > http://askubuntu.com/questions/1400/how-do-i-optimize-the-os-for-ssds > > I run fstrim periodically via cron and everything seems fine. > > However from time to time by system ends up to be mounted *read-only*. > > dmesg gives errors like this: > > [105074.721310] ERROR: (device sda5): dbDiscardAG: no memory for trim array > > (I could send the complete result of dmesg, but it is large. I obtained > it by dmesg | pastebinit). > > Since the fstab entry states errors=remount-ro I presumed this is the > source for the read only remount.
Yeah, that would explain it. The error should be a warning. No harm is done if the trim fails and there is no danger continuing to using the filesystem. > > I can remount my hard disk and continue as if nothing has happened or I > can reboot. > > In any case I would like to know: > > - what can I do to prevent this problem, since it is annoying and > might result in loss. The quick fix might be to change to fstab entry to errors=continue The real fix is to change the error to a warning. I'll go ahead and make that change. > > - is it safe just to remount or should I reboot? Just remounting is safe. This error is not the result of any filesystem corruption. > > Thanks and regards > > Uwe Brauer ------------------------------------------------------------------------------ Dive into the World of Parallel Programming. The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Jfs-discussion mailing list Jfs-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jfs-discussion
