On 3/17/2013 6:42 AM, Subranshu Patel wrote: > What I understand is that, XFS being a journalling filesystem makes running > xfs_repair after a unclean unmount unnecessary. > > After a system crash or force power down, one can mount the filesystem > which causes the journal to be replayed and handles the half finished > writes. This is one part. But there can be other file corruption as well > and these can be handled by xfs_repair. > So the crux is to mount the filesystem so that journal will be replayed, > and then unmount the filesystem and run xfs_repair. (Assuming xfs_repair > may not be a mandatory step always) > > In case of EXT4, journal will not be replayed on performing mount. One need > to invoke fsck which performs journal playback and then other corruption > checks/recovery. > Correct me if I am wrong. Enough with the foreplay. Get to your point please. I'm assuming you think you have an exception, a bug, to report. -- Stan > > On Sun, Mar 17, 2013 at 10:56 AM, Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx> > wrote: >> >> On 3/16/2013 10:56 AM, Subranshu Patel wrote: >> >>> This is not observed in EXT4, fsck successfully recovers without >>> mounting the filesystem. >> >> And this is the real problem. You're *assuming* XFS should behave in >> the same manner as EXT4. Why would you assume a Ferrari should behave >> like a Tata Nano? >> >> XFS is far more sophisticated than EXT4 in many, many ways, including >> recovery after unclean shutdown. XFS kernel code performs journal >> playback/recovery automatically when the filesystem is mounted. >> xfs_repair is a tool for fixing filesystems that are broken, not simply >> in need of journal playback. Thus xfs_repair has no code to perform >> journal recovery. >> >> EXT4 (and EXT3) lacks this sophistication and must call a user space >> tool, e2fsck, to perform journal playback/recovery. >> >> XFS is the Ferrari of Linux filesystems and EXT is the Tata. Keep that >> in mind as you discover many of the other differences in the future. >> >> -- >> Stan >> > > > > _______________________________________________ > xfs mailing list > xfs@xxxxxxxxxxx > http://oss.sgi.com/mailman/listinfo/xfs > _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
