MACALLSTR@vax1.physics.oxford.ac.UK (06/29/88)
While disk defragmenters may only produce dramatic performance improvements on very badly fragmented disks ( usually disks with little free space ) for individual applications, you will a notice drop in BACKUP time after the disk has been defragmented. I have tried DISKEEPER and RABBIT-7 and am using RABBIT-7 mainly because at the time the decision was made ( about a year ago ) RABBIT-7 gave more flexibility. Anyone using disk defragmenting packages ought to be aware of what the package is doing to the arrangement of files on the disk ; free space may be concentrated in one chunk at the beginning/end/somewhere in between of the disk or it may be divided into several separate chunks distributed over the disk. You must discover which formula suits your system : do you have many small/medium/large files or does the disk contain several large database files for example? John
brent@uwovax.uwo.ca (06/30/88)
In article <8806282211.AA01437@ucbvax.Berkeley.EDU>, MACALLSTR@vax1.physics.oxford.ac.UK writes: > While disk defragmenters may only produce dramatic performance improvements > on very badly fragmented disks ( usually disks with little free space ) for > individual applications, you will a notice drop in BACKUP time after the > disk has been defragmented. > I have tried DISKEEPER and RABBIT-7 and am using RABBIT-7 mainly because at > the time the decision was made ( about a year ago ) RABBIT-7 gave more > flexibility. <stuff omitted here to reduce posting size> > Funny. We looked at SQUEEZPAK (DEMAC) and RABBIT-7. (DISKEEPER wanted up front money to evaluate, so it wasn't. :-) Both did about the same job, but we had better results from RABBIT-7 on a severely fragamented disk (which was also *very* full. Despite the fact that this is not the normal way we'll use the s/w (in ongoing runs, they came out about the same), there was a slightly cosier feeling about RABBIT. And when pressed, both companies' pricing became very similar. BTW the file *placement* facility in v3.0 looks really slick. Once we get it up and running, the net may get a review. Cheers. Brent.