On Monday 26 August 2019 23:55:31 Olivier wrote: > Gene Heskett <ghesk...@shentel.net> writes: > > Generally speaking, only because the disc is random access. > > But a disk dedicated to vtapes should be doing a lot of sequetial > accesses: once it has been formatted and the slots have been assigned, > it is writting files the size of one Amanda's chunk. In fact, that > would be worth a study: the disk usage for vtapes vs. normal disk > usage. > > That is just gross figures but: > > Users' home directories: > Filesystem Size Used Avail Capacity Mounted on > /dev/da1p1 2.9T 851G 1.8T 31% /home > 2565312 files, 223129681 used, 556890331 free > (564355 frags, 69540747 blocks, 0.1% fragmentation)
My Mail dir is on /home, dates back to about my 2nd install in 2001, with probably north of 20 GB of maildirs, so I'd expect that is more than 1% fragmented, but except for tde's kmail occasionally bucking about it, has not been a major problem. Copying it to a new Maildir usually fixes it for that particular list. Reducing the keep time for those lists deemed not so important has also helped. About 3 lists I keep forever, but 50 more are expired every 3 or 6 months. > Amanda vtape disk: > Filesystem Size Used Avail Capacity Mounted on > /dev/ada5p1 2.6T 2.2T 269G 89% /automnt/ada5 > 475 files, 582393950 used, 127171372 free > (84 frags, 15896411 blocks, 0.0% fragmentation) > > The vtape disk is slightly older than the users' home, definitely > fuller and less fragmented, so I would guess big sequetial files with > little head movement. > I wondered about fragmentation myself, but it has never reared its head in well over 15 years. > Good luck with your health. > Thank you. > Olivier Copyright 2019 by Maurice E. Heskett Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene>
