Re: Why doesn't background fsck work ?
On Thu, 19 Jun 2003 00:25:22 -0700 Terry Lambert <[EMAIL PROTECTED]> wrote: > Then you reboot. > > Then you start BG fsck again. > > Then you panic again. > > Repeat this until a human intervenes and manually runs a full FG > fsck on the disk before letting it be used, and/or someone adds > a count-down counter to the superblock, I have a dejá vue... I think there was already a discussion on this topic (and you participated in it)... and I think someone pointed out, that we already have a mechanism which does a fg-fsck instead of a bg-fsck in such a situation... but maybe someone just changed the Matrix around me... Bye, Alexander. -- Reboot America. http://www.Leidinger.net Alexander @ Leidinger.net GPG fingerprint = C518 BC70 E67F 143F BE91 3365 79E2 9C60 B006 3FE7 ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Why doesn't background fsck work ?
[ ... BG fsck ... ] > > I haven't got softupdates enabled, but I didn't want to enable it, > > because I've heard that it isn't 100% reliable and I didn't want to lose > > data > > Theer have been no problems with softupdates in regard to data > integrity in either 5.0 or 5.1 release. I do recall a couple of > glitches at various times in current, probably prior to 5.0-Release. If you end up with real disk corruption as a result of power failure, a BG fsck will potentially not correct it. The CG bitmaps that are set that shouldn't be are effectively read-only, and the snapshot permits you to fsck in the background. However, this assumes that the only thing that's blown is the CG bitmap. If anything else is blowm then it's likely your system will panic when it tries to use corrupt data in some pointer math or some other use in the implementation of the FS in the kernel. At this point you panic. Then you reboot. Then you start BG fsck again. Then you panic again. Repeat this until a human intervenes and manually runs a full FG fsck on the disk before letting it be used, and/or someone adds a count-down counter to the superblock, and the on disk FS layout changes yet again and becomes incompatible with older versions of the kernel and fsck, both, and requires a fsck with a special flag to "upgrade" the FS. -- Terry ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Why doesn't background fsck work ?
> From: Juan Rodriguez Hervella <[EMAIL PROTECTED]> > Date: Wed, 18 Jun 2003 17:51:00 +0200 > Sender: [EMAIL PROTECTED] > > On Wednesday 18 June 2003 17:39, Bernd Walter wrote: > > On Wed, Jun 18, 2003 at 04:54:44PM +0200, Juan Rodriguez Hervella wrote: > > > Hello!: > > > > > > I tried to make my Nvidia video card work yesterday, and everytime > > > I launched the X system my computer hang up. So I had to > > > make a hard reboot. > > > (I think I will fix the Xs problem this night at home) > > > > > > But I've got another weird problem. :) > > > > > > The fsck of my partitions is always made on the foregroud, > > > although I've heard about something like a delayed/background > > > file system checker. > > > > > > Why is it always made on the foreground ? > > > > No softupdates enabled? > > yes, you've got it ! > > I haven't got softupdates enabled, but I didn't want to enable it, > because I've heard that it isn't 100% reliable and I didn't want to lose > data Theer have been no problems with softupdates in regard to data integrity in either 5.0 or 5.1 release. I do recall a couple of glitches at various times in current, probably prior to 5.0-Release. There is an issue of combining softupdate and write cache. In the event of a power failure, this could lead to a loss of data integrity. But write-cache is dangerous even without softupdate. In addition, because of the nature of softupdate, it is possible that a file is created/updated shortly before a system failure. While data corruption should not be an issue, the file may simply not be there after the system re-boots or may be in an earlier (but still consistent) state. You should probably turn off write cache on any system that you think might lose power. (And just how reliable is that UPS? Batteries (DC) are probably much safer.) But I don't think soft updates are a significant issue. (Others can feel free to tell me I'm an idiot.) You should probably read Kirk's Usnix paper on soft updates. It's very good. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: [EMAIL PROTECTED] Phone: +1 510 486-8634 ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Why doesn't background fsck work ?
On Wed, Jun 18, 2003 at 05:51:00PM +0200, Juan Rodriguez Hervella wrote: > On Wednesday 18 June 2003 17:39, Bernd Walter wrote: > > On Wed, Jun 18, 2003 at 04:54:44PM +0200, Juan Rodriguez Hervella wrote: > > > Hello!: > > > > > > I tried to make my Nvidia video card work yesterday, and everytime > > > I launched the X system my computer hang up. So I had to > > > make a hard reboot. > > > (I think I will fix the Xs problem this night at home) > > > > > > But I've got another weird problem. :) > > > > > > The fsck of my partitions is always made on the foregroud, > > > although I've heard about something like a delayed/background > > > file system checker. > > > > > > Why is it always made on the foreground ? > > > > No softupdates enabled? > > yes, you've got it ! > > I haven't got softupdates enabled, but I didn't want to enable it, > because I've heard that it isn't 100% reliable and I didn't want to lose > data Softupdates works reliable from what I can tell. Snapshots might have some issues and background fsck uses snapshots. -- B.Walter BWCThttp://www.bwct.de [EMAIL PROTECTED] [EMAIL PROTECTED] ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Why doesn't background fsck work ?
On Wednesday 18 June 2003 17:39, Bernd Walter wrote: > On Wed, Jun 18, 2003 at 04:54:44PM +0200, Juan Rodriguez Hervella wrote: > > Hello!: > > > > I tried to make my Nvidia video card work yesterday, and everytime > > I launched the X system my computer hang up. So I had to > > make a hard reboot. > > (I think I will fix the Xs problem this night at home) > > > > But I've got another weird problem. :) > > > > The fsck of my partitions is always made on the foregroud, > > although I've heard about something like a delayed/background > > file system checker. > > > > Why is it always made on the foreground ? > > No softupdates enabled? yes, you've got it ! I haven't got softupdates enabled, but I didn't want to enable it, because I've heard that it isn't 100% reliable and I didn't want to lose data Do you recommend me to switch it on ? Thanks! -- JFRH ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Why doesn't background fsck work ?
On Wed, Jun 18, 2003 at 04:54:44PM +0200, Juan Rodriguez Hervella wrote: > Hello!: > > I tried to make my Nvidia video card work yesterday, and everytime > I launched the X system my computer hang up. So I had to > make a hard reboot. > (I think I will fix the Xs problem this night at home) > > But I've got another weird problem. :) > > The fsck of my partitions is always made on the foregroud, > although I've heard about something like a delayed/background > file system checker. > > Why is it always made on the foreground ? No softupdates enabled? -- B.Walter BWCThttp://www.bwct.de [EMAIL PROTECTED] [EMAIL PROTECTED] ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Why doesn't background fsck work ?
Hello!: I tried to make my Nvidia video card work yesterday, and everytime I launched the X system my computer hang up. So I had to make a hard reboot. (I think I will fix the Xs problem this night at home) But I've got another weird problem. :) The fsck of my partitions is always made on the foregroud, although I've heard about something like a delayed/background file system checker. Why is it always made on the foreground ? -- JFRH ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "[EMAIL PROTECTED]"
