On Fri, 18 Jul 2003 10:26, Mike Maltese wrote: > What impact do disk block and fragment sizes have on a vinum volume? I've > been benchmarking an array of three drives in striped and raid5 > configurations with various stripe sizes. I've noticed that I get better > results in just about every instance by passing -b 16384 -f 2048 to newfs. > This doesn't make sense to me as those are the defaults for newfs if they > are not specified, but looking at the disklabel after a newfs, it shows > 8192/1024. Should these options really make a performance difference, and > if so, how? > > Thanks, Mike
I have had similar experience, getting 8192/1024 when using newfs on a vinum volume. Obviously 16384/2048 is not the default in this case, in spite of the newfs man pages. In a classical file system I believe these numbers are taken from the disklabel and it is realy the disklabel that supplies these defaults for the partitions. For vinum the individual volumes do not have a corresponding disklabel partition. -- All guess work so don't take it too seriously. Malcolm _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"