tony@mwuk.UUCP (Tony Mountifield) (01/30/91)
Hi Folks, I am running a Sun-3/80M with SunOS 4.0.3. I have just received the following console message: vmunix: /home: optimization changed from TIME to SPACE What exactly does this mean, and why would the kernel have decided to do it? I have tried looking up likely places in the manuals to no avail. Please mail replies, thanks. Tony. -- Tony Mountifield. | Microware Systems (UK) Ltd. MAIL: tony@mwuk.uucp | Leylands Farm, Nobs Crook, INET: tony%mwuk.uucp@ukc.ac.uk | Colden Common, WINCHESTER, SO21 1TH. UUCP: ...!mcsun!ukc!mwuk!tony | Tel: 0703 601990 Fax: 0703 601991 **** OS-9, OS-9000 Real Time Systems **** MS-DOS - just say "No!" ****
swindon.ingr.com (Nik Simpson x4333) (02/05/91)
In article <262@mwuk.UUCP> tony@mwuk.UUCP (Tony Mountifield) writes: >Hi Folks, > >I am running a Sun-3/80M with SunOS 4.0.3. > >I have just received the following console message: > > vmunix: /home: optimization changed from TIME to SPACE > >What exactly does this mean, and why would the kernel have decided to do it? > >I have tried looking up likely places in the manuals to no avail. > >Please mail replies, thanks. > >Tony. >-- The message is referring to a change in disk space allocation on the /home file system, when the disk partition gets more than about 80% full the kernel changes the algorithm for allocating disk space , normally it seeks to optimise disk performance, when space gets tight it will try to optimise the use of the remaining space. The point at which this happens can be set by the System Administrator by using the "tunefs(1M)" command. You will take quite a performance penalty if this is happening on a heavily used file system. -- |--------------------------------------------------| | Nik Simpson UUCP :uunet!ingr!swindon!st_nik!nik| | Systems Consultant (UNIX). Intergraph UK Ltd. | |--------------------------------------------------|