On Wed, 29 Dec 1999, E Hunter wrote:
> Can anyone fill me in on the use of this _wac_ command , what it
> does, how often it needs to be done, and whehter or not the filer
> requires downtime to do it?
It is wack, from WAFL Check, a play on UNIX's fsck. Actually it is a
collection of filesystem check commands beginning with wack and ending
with a letter (z and y come to mind). If you have no hardware bizarre
hardware failures or do not encounter some exotic bug you shouldn't have
to do it at all. I really remember doing this only once on one filer (we
have about 20) and it was due to FC-AL flakiness which was later
rectified. I believe that running all incantations of this command
requires downtime. Recently NetApp solicited some input as to whether
they should engineer another wack command that would minimize downtime and
provide a means to profilactically verify filesystem integrity.
Sincerely;
Tom
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