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nowmedia
2006 Dec 18
1
zfs/fstyp slows down recognizing pcfs formatted floppies
I''ve noticed that fstyp on a floppy media formatted with "pcfs" now needs somewhere between
30 - 100 seconds to find out that the floppy media is formatted with "pcfs".
E.g. on sparc snv_48, I currently observe this:
% time fstyp /vol/dev/rdiskette0/nomedia
pcfs
0.01u 0.10s 1:38.84 0.1%
zfs''s /usr/lib/fs/zfs/fstyp.so.1 seems to add about 40 seconds to that time, because it
reads 1 mbyte from the floppy media (~ 2/3 of a 1.44MB floppy), only to find out that the
floppy media does not contain a zfs pool:
SPARC snv_48, before tamarack:
% time...