I am running Amanda 2.5.0 on a Solaris 10 host. This is the first time I
have tried the tape_splitsize to backup a large filesystem.

My dump type looks a follows:
define dumptype users-tar-span {
global
comment "backup of users using tar with spanning"
program "GNUTAR"
tape_splitsize 30 Gb
maxdumps 10
exclude list "/pkgs/amanda/etc/amanda/exclude/user_exclude"
}

In /var/amanda/archive/amdump I have

taper: r: end zorn./export/fssnap/users.20060425201728.0 part 6064,
splitting chunk that started at 62085120kb after 10208kb (next chunk will
start at 62095328kb)
taper: reader-side: got label archive:000068 filenum 6066
taper: r: end zorn./export/fssnap/users.20060425201728.0 part 6065,
splitting chunk that started at 62095360kb after 10208kb (next chunk will
start at 62105568kb)
taper: reader-side: got label archive:000068 filenum 6067

I killed the backup and the email output from the run showed the following:

  taper: tape archive:000067 kb 172276416 fm 18 writing file: short write
  taper: retrying zada:/export/data.0 on new tape due to: [writing file:
short write]
  taper: mmap not available: using fallback split size of 10240kb to buffer
zorn:/export/fssnap/users.0 in-memory
  taper: tape archive:000068 kb 173468288 fm 7872 [OK]
  taper: Received signal 15

The filesystem that I am trying to backup with the tape split is 300GB.
After 12 hours the 300GB file system had only written about 60GB. I assume
the problem is the "mmap not available" and the split size of 10GB

QUESTIONS:

1) The above log seems to show that the tape_splitsize is 10G and not the
30G that I indicated in the tape_splitsize. Is this correct? Other than the
tape_splitsize what other parameter do I need.

2) My backup was running slow and and noticed that zorn./export/fssnap/users
was not in the HOLDING DISK so it must be reading the backup directly from
the disk. My holding disk is 200GB and the filesize that I am backing up is
300GB. Do I need to have my HOLDING DISK size as large as the file system
that I am backing up when using the tape_splitsize?

Thanks
_____________________________________________________________________
Robert P. McGraw, Jr.
Manager, Computer System                 EMAIL: rmcgraw AT purdue DOT edu
Purdue University                         ROOM: MATH-807
Department of Mathematics                PHONE: (765) 494-6055
150 N. University Street                   FAX: (419) 821-0540
West Lafayette, IN 47907-2067            

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