On Friday 18 October 2002 00:06, Huiqun wrote:
>Hi all:
>
>Recently I setup amanda 2.4.p2 on our Solaris system, it seems
> working fine. I'm using a HP DDS2 tape which has a 4GB capacity,
> I got the following tapetype value from this mailing list:
>
>define tapetype HP-DDS2 {
> comment "HP DDS2"
> # data got from amanda email archive
> length 3780 mbytes
> filemark 3 kbytes
> speed 380 kbytes
>}
>
>Following is part of my Amanda report:
>STATISTICS:
> Total Full Daily
> -------- -------- --------
>Estimate Time (hrs:min) 0:01
>Run Time (hrs:min) 1:18
>Dump Time (hrs:min) 0:44 0:42 0:02
>Output Size (meg) 1906.7 1832.6 74.1
>Original Size (meg) 6904.9 6761.3 143.6
>Avg Compressed Size (%) 27.6 27.1 51.6 (level:#disks
> ...) Filesystems Dumped 9 6 3 (1:3)
>Avg Dump Rate (k/s) 745.2 746.1 723.6
>Tape Time (hrs:min) 1:18 1:15 0:03
>Tape Size (meg) 1907.0 1832.8 74.2
>Tape Used (%) 50.5 48.5 2.0 (level:#disks ...)
>Filesystems Taped 9 6 3 (1:3)
>Avg Tp Write Rate (k/s) 419.5 419.8 411.8
>
>The report says my Tape Size is only 2GB, and the Output Size is
> 2GB also. Thus some of my file system failed dumping to the tape
> because the dump is too big(it's not correct, that file system is
> only 900MB). I also noticed the Tape Used value is only 50%.
>
>Is my Tapetype setting correct?
It sure looks good from here, that looks pretty much like my own
tapetype settings as I'm also using that tape. I also see that you
are compressing the data with an amanda choice in the dumptype.
That leaves two questions.
1. Does that version of solaris perchance have a 2 gig file size
limit?
2. Are you also trying to use the drives builtin hardware
compression?
If 1, then it sounds like its update solaris time. Not much we can
do for it from here.
If 2, then be aware that highly compressed data, when fed to the
hardware compressor in the drive, will actually grow, and from the
data rate reported for that drive, my guess is thats its enabled,
otherwise most of those drives top out at about 380k/sec.
You are reporting figures in the 420k/sec range, suggesting its
compressing a bit here and there, so it appears you aren't feeding
it anything that it can gain much ground on. With hardware on, and
raw text to the drive which it can squeeze pretty good, the data
rate should be up in the 700k/sec area.
But to be honest, I can't say as I'm aware of the data growing by
100% under those conditions, maybe 15 to 20 percent has been most
users experience.
Maybe Jon or Jean-louis will chime in with a better idea, but thats
what I get for the data given.
Turning off the compression on a tape thats been written in the
compressed mode is a bit of a trick as the tape keeps resetting the
compression to on during the recognition phase when its inserted
into the drive, and I've posted a procedure to do that turnoff here
on this list enough times to bore most of the list but you should
be able to find it in the archives.
--
Cheers, Gene
AMD K6-III@500mhz 320M
Athlon1600XP@1400mhz 512M
99.18% setiathome rank, not too shabby for a WV hillbilly
