Networker

Re: [Networker] any tips for backing up enormous sparse files?

2005-12-20 14:45:25
Subject: Re: [Networker] any tips for backing up enormous sparse files?
From: Tim Mooney <mooney AT DOGBERT.CC.NDSU.NODAK DOT EDU>
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Date: Tue, 20 Dec 2005 13:38:38 -0600
In regard to: RE: [Networker] any tips for backing up enormous sparse...:

on reading the manpage to the end, it says that you can't specify it
yourself. it just comes into play when the disk block count does not
match the byte size for a file...

i have been reading up on sparse files.... unless the o/s (filesystem
provider) gives you a function to read only the real blocks of a sparse
file you have to read all the way through the file.... I can't find
anything specific in solaris, and if there is such a thing for linux
filesystems it may be that legato is not coded to use it....

Thanks for the additional information on this!  I can't find any
specific interface for this (I would expect it to be part of either the
fcntl, open, or read system calls) on Linux either.

I'm also guessing that you're correct about your last point too -- even
if there is one, NetWorker probably isn't using it (yet).  If I discover
there is some API for doing this, I'll report back.

Tim

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