6.x loosing record of free space after filesystem fills?

Oliver Fromme olli at lurza.secnetix.de
Tue Jan 9 17:37:24 UTC 2007

Guy Helmer wrote:
 > I think we've finally found the cause of the problem - it wasn't just 
 > occurring after heavy use, but was visible right after filesystem 
 > creation!  We regularly built new filesystems with "newfs -U -O 1 -b 
 > 65536 -f 8192"

Why are you using those blocksize and fragsize settings?
(If you store large files, then you should at least also
decrease the inode density, using the -i option.)

Some time ago, Joe Greco wrote:
 > > the one unusual thing about the configuration is that the filesystem
 > > we are attempting to build on is a 136GB ccd across 4 scsi disks with
 > > the fsize=8192 and the bsize=65536 (it is mainly to be used for large
 > > data log files):
 > FreeBSD doesn't support fsize/bsize so large.  There are ongoing issues
 > within the filesystem code and VM code that will cause such filesystems
 > to break under heavy load.  Matt Dillon also talked about this being less-
 > than-optimal for the VM system from some technical points of view.

It has been a while, and I'm not sure if there are still
problems with those non-standard fsize/bsize settings, but
I would definitely try to avoid them for production use.

Best regards

Oliver Fromme,  secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing
Dienstleistungen mit Schwerpunkt FreeBSD: http://www.secnetix.de/bsd
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