My configuration:
zorn->[8] > amadmin daily version build: VERSION="Amanda-2.5.2-20070530" BUILT_DATE="Thu May 31 09:14:26 EDT 2007" BUILT_MACH="SunOS zorn.math.purdue.edu 5.10 Generic_118833-03 sun4u sparc SUNW,Sun-Fire-280R" CC="/pkgs/gcc-3.4.3/bin/gcc" CONFIGURE_COMMAND="'./configure' 'CC=/pkgs/gcc-3.4.3/bin/gcc' 'MT=/opt/csw/bin/mt' 'MTF=-f' 'MTX=/opt/csw/sbin/mtx' 'PERL=/opt/csw/bin/perl' '--prefix=/local/Amanda/amanda-2.5.2-20070530' '--with-user=amanda' '--with-group=operator' '--with-gnutar=/opt/csw/bin/gtar' '--with-gnutar-listdir=/var/amanda/gnutar-lists' '--with-includes=/opt/csw/include' '--with-libraries=/opt/csw/lib' '--with-index-server=zorn' '--with-smbclient=/pkgs/samba/bin/smbclient' '--with-tape-device=/dev/rmt/1bn' '--with-changer-device=/dev/changer/1' '--with-maxtapeblocksize=2048'" My tape unit is a Sun C4 38 slot and 1 LTO2 tape drive. My tapetype is defined as followed define tapetype LTO2-HWC { comment "LTO-2-Hardware Compression on." blocksize 1024 kbytes length 300000 mbytes #200G filemark 0 kbytes speed 27315 kps #27 Mb/s } "length 300000 mbytes" was calculated by 1.5 times the actual size of 200GB. Up to now my dumptype has had compress equal to none. I decided to let the hardware do the compression work. The problem with this is the calculation of the length is just a guess and seems to cause problems when trying to fit files on the tape. In some cases amanda thinks it has more tape than it really does so it tries to write a bigger file to the last part of the tape and fails. I am thinking of changing my setup to do software compression and see if this will give me better tape usage. Q1) I have asked Sun and the makers of the LTO2 drive and it seems there is no way to turn hardware compression on or off on this unit, it is always on. >From my reading in the Amanda forum it seems that the LTO2 drive will sense if the data is compressed and turn off hardware compression if the data is already compressed. Is this correct? Q2) Any suggestions, pros or cons in going this direction? I guess the trade off is that I would get better tape usage at the expense of compute time to do the software compression. Q3) From the config.log it seems the default program for compression is gzip and it uses -fast or -best. From gzip man page it says I can use -#x where x is between 1 (fast) 9 (best). Is there a way to set the compress number without having to use the "compress server custom"? Thanks Robert _____________________________________________________________________ Robert P. McGraw, Jr. Manager, Computer System EMAIL: [EMAIL PROTECTED] 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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