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Filesystems, Disks and Memory
UFS benifits
Post 50149 by Perderabo on Friday 16th of April 2004 11:15:55 PM
04-17-2004
The original unix filesystem, designed by Ken Thomson, did not support symbolic links. Filenames were limited to 14 characters.
And it did not control fragmentation. We had to periodically defragment our filesystems by copying them to tape and reloading back on a fresh filesystem. And on our 3B2, I had to unload a 25 MB disk to diskettes to defrag. This was not my favorite job.
It really was designed in an era of tiny (by today's standards) disks and it didn't scale up to larger disks (larger = about 100 MB or so). It was comparable to FAT-16 or something except that FAT-16 has an in-place defragmenter.
The BSD filesystem, designed by Kirk Mckusick, addressed all of those issues and it was a big step forward. It really took over very quickly.
Also it seemed to be more robust. It seems like we lost fewer filesystems with the BSD design...and not just because of the backup superblocks.
So, yes, I noticed a few differences.
And it did not control fragmentation. We had to periodically defragment our filesystems by copying them to tape and reloading back on a fresh filesystem. And on our 3B2, I had to unload a 25 MB disk to diskettes to defrag. This was not my favorite job.
It really was designed in an era of tiny (by today's standards) disks and it didn't scale up to larger disks (larger = about 100 MB or so). It was comparable to FAT-16 or something except that FAT-16 has an in-place defragmenter.
The BSD filesystem, designed by Kirk Mckusick, addressed all of those issues and it was a big step forward. It really took over very quickly.
Also it seemed to be more robust. It seems like we lost fewer filesystems with the BSD design...and not just because of the backup superblocks.
So, yes, I noticed a few differences.
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LEARN ABOUT DEBIAN
filesystem
filesystem(7) Miscellaneous Information Manual filesystem(7) NAME
filesystem - event signalling that filesystems have been mounted SYNOPSIS
filesystem [ENV]... DESCRIPTION
The filesystem event is generated by the mountall(8) daemon after it has mounted all filesystems listed in fstab(5). mountall(8) emits this event as an informational signal, services and tasks started or stopped by this event will do so in parallel with other activity. EXAMPLE
A service that wishes to be running once filesystems are mounted might use: start on filesystem SEE ALSO
mounting(7) mounted(7) virtual-filesystems(7) local-filesystems(7) remote-filesystems(7) all-swaps(7) mountall 2009-12-21 filesystem(7)