Am Tue, 22 Mar 2016 21:07:35 +0100 schrieb Henk Slager <eye...@gmail.com>:
> On Tue, Mar 22, 2016 at 9:03 AM, Kai Krakow <hurikha...@gmail.com> > wrote: > > Hello! > > > > Since one of the last kernel updates (I don't know which exactly), > > I'm experiencing csum errors within VDI files when running > > VirtualBox. A side effect of this is, as soon as dmesg shows these > > errors, commands like "du" and "df" hang until reboot. > > > > I've now restored the file from backup but it happens over and over > > again. > > > > On another machine I'm also seeing errors with big files in the > > following scenario (apparently an older kernel, 4.1.x I afair): > > > > # ntfsclone --save /dev/md126p2 -o rescue.ntfs.img > > ^ big NTFS partition ^ file on btrfs > > > > results in a write error and the file system goes read-only. > > > > Both systems have in common they are using btrfs on bcache with > > compress=lzo,autodefrag,nossd,discard (mraid=1,draid=0 and > > mraid=1,draid=single). > > autodefrag,nossd: I am using these too on bcached btrfs, so far no > issues (including kernel 4.5.0). I have been writing bigfiles (> 50G) > without problems. > compress=lzo: I have used it on bcached btrfs in the past, worked fine > discard: I am not sure what this should do on top of /dev/bcacheX ; I > don't know how this relates to the bcache discard; I currently have > bcache setting: Discard? False > > I am not saying that the last mount option is the direct cause of the > problems you experience, it is just that I don't know its impact > currently. Well, maybe interesting... My backup drive doesn't use discard and shows no such misbehavior. I try disabling it as soon as I'm having some time elaborating on that. I guess only the devs can tell how discard interacts with bcache, and if it makes sense to enable it for this setup. -- Regards, Kai Replies to list-only preferred. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
