Re: fsck of big disk
On Tuesday 11 December 2007 09:19:46 am Valerio Daelli wrote: > Hi, > thanks a lot for your answer. > > > > we have a freshly installed FreeBSD 6.2 machine with a gstriped > > > external disk, of 5.3Tb. The disk is composed of two slices of 2.6 Tb. > > > We are trying to have a (background) fsck of it but few hours later > > > since the start of the check > > > the host get unresponsive: it responds to ping but it doesn't let > > > login anyone, nor by ssh > > > nor by console. > > > > What do you get if you press Control-T on the console when it is > > unresponsive? > > We are not able to login via console nor via ssh. > Pheraps you suggest me to press Control-T on the console even if I am not > logged on. I did not try, sorry. > > > When you do a background fsck there is a point at which a snapshot of > > the filesystem is taken, although I'd say that happens at the beginning > > of the check. The problem is that with 5.3 Tb, it may take quite a while > > to take the snapshot, and during that time the system blocks any process > > that tries to write to the filesystem. Maybe that's what you are > > experiencing. > > What you explained us sounds very interesting. But anyway we simply > solved by disabling background fsck on such a big partition. We had > panics and reboot > and we did not want to risk on a production host. > Bye > > Valerio Daelli What you are probably running in to is memory starvation. In my experience fsck on a moderately filled disk uses something on the order of 1 gig of RAM per TB of filesystem. If you have this in an array with less than 4 gigs of RAM it's possible that it was just buried in swap and spending all it's time moving pages in and out as opposed to doing anything useful. -- Thanks, Josh Paetzel PGP: 8A48 EF36 5E9F 4EDA 5A8C 11B4 26F9 01F1 27AF AECB signature.asc Description: This is a digitally signed message part.
Re: fsck of big disk
Hi, thanks a lot for your answer. > > we have a freshly installed FreeBSD 6.2 machine with a gstriped external > > disk, > > of 5.3Tb. The disk is composed of two slices of 2.6 Tb. > > We are trying to have a (background) fsck of it but few hours later > > since the start of the check > > the host get unresponsive: it responds to ping but it doesn't let > > login anyone, nor by ssh > > nor by console. > > > What do you get if you press Control-T on the console when it is > unresponsive? We are not able to login via console nor via ssh. Pheraps you suggest me to press Control-T on the console even if I am not logged on. I did not try, sorry. > > When you do a background fsck there is a point at which a snapshot of > the filesystem is taken, although I'd say that happens at the beginning > of the check. The problem is that with 5.3 Tb, it may take quite a while > to take the snapshot, and during that time the system blocks any process > that tries to write to the filesystem. Maybe that's what you are > experiencing. > What you explained us sounds very interesting. But anyway we simply solved by disabling background fsck on such a big partition. We had panics and reboot and we did not want to risk on a production host. Bye Valerio Daelli ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: fsck of big disk
Valerio Daelli wrote: Hi list we have a freshly installed FreeBSD 6.2 machine with a gstriped external disk, of 5.3Tb. The disk is composed of two slices of 2.6 Tb. We are trying to have a (background) fsck of it but few hours later since the start of the check the host get unresponsive: it responds to ping but it doesn't let login anyone, nor by ssh nor by console. What do you get if you press Control-T on the console when it is unresponsive? When you do a background fsck there is a point at which a snapshot of the filesystem is taken, although I'd say that happens at the beginning of the check. The problem is that with 5.3 Tb, it may take quite a while to take the snapshot, and during that time the system blocks any process that tries to write to the filesystem. Maybe that's what you are experiencing. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
fsck of big disk
Hi list we have a freshly installed FreeBSD 6.2 machine with a gstriped external disk, of 5.3Tb. The disk is composed of two slices of 2.6 Tb. We are trying to have a (background) fsck of it but few hours later since the start of the check the host get unresponsive: it responds to ping but it doesn't let login anyone, nor by ssh nor by console. In the meanwhile we are having a large rsync from another host. Tonight during the fsck/rsync we had a reboot, without special messages on the console. We have 1Gb of RAM on this server. Is 1Gb too small as memory to have a fsck and a rsync on a server with 5.3Gb as external disk? Thanks for your precious help Valerio Daelli Server: i386 - HP DL360 CPU pentium4 1Gb RAM HBA: LSI Logic 929 External disk: Apple XRAID with upgraded firmware ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
