Yung Le wrote:

Hi,
I am backup the systems using amanda version 2.4.4p2 with tape array DELL
Power Vault 132T LTO2 hardware compress (24 tapes inside).

The configure of LTO using
define tapetype LTO2 {
    comment "LTO2 tape drives"
    length 406122 mbytes        # 400 Gig tapes
    filemark 9721 kbytes
    speed 2272 kbytes           # 1.5 Mb/s
}

One little remark.  Was this generated with amtapetype?  Besides the
obvious fact that you "hope" for a very optimistic compression ratio
of 2/1, I find the speed value very low for such a tapedrive.
The speed value is not used inside amanda, never mind.
But it surely shows you have a problem somewhere else in the system,
or connected the tapedrive to a very slow SCSI card.

But when I backup. Only first tape can backup 400GB. The rest of tapes
backup only 200GB.
Label        Time      Size      %    Nb
  000020      13:45  336315.1   83.1   114
  000021       2:35  158061.3   38.9     8
  000022       2:21  191737.2   47.2     8

The numbers here are the sizes of the "useful" dumps.  Amanda just write
onto tape until it hits into EndOfTape.  The point at which that happens
is reported to in the NOTES section, like this (for my AIT-1 tapedrive):

The file that didn't fit is started all over again on the next tape.

I bet that file number 9 on the second tape is larger than 50 Gbyte and
that most of the 8 other, together with this 9th dump do not compress
that well, so that you're closer to a native capacity of 200 GB than to
the the hoped 400 GB.

The lines in the NOTES section allow you to specify a closer estimate to
your tapecapacity with compression enabled.


--
Paul Bijnens, Xplanation                            Tel  +32 16 397.511
Technologielaan 21 bus 2, B-3001 Leuven, BELGIUM    Fax  +32 16 397.512
http://www.xplanation.com/          email:  Paul.Bijnens AT xplanation DOT com
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