IIRC, the tapetype test uses random data, so hardware compress may (?)
actually increase the amount of the data.
-Kevin Zembower
-----
E. Kevin Zembower
Unix Administrator
Johns Hopkins University/Center for Communications Programs
111 Market Place, Suite 310
Baltimore, MD 21202
410-659-6139
>>> Don Potter <[EMAIL PROTECTED]> 01/17/02 09:10AM >>>
I ran the tapetype test to our tapedrive (ADIC DS9400D) using DLTTAPE
IV. I frontpaneled the compression so I expected at least 40 GB when
the tapetype was completed. But I only got about 17GB:
Command: tapetype -d /dev/rmt/0n
define tapetype unknown-tapetype {
comment "just produced by tapetype program"
length 17587 mbytes
filemark 13 kbytes
speed 1011 kps
}
Then I ran it with software compression (/dev/rmt/0cn) and I only got
20 GB:
Command: tapetype -d /dev/rmt/0cn
define tapetype unknown-tapetype {
comment "just produced by tapetype program"
length 19565 mbytes
filemark 4 kbytes
speed 1101 kps
}
Both ways I would of expected close to double the native writes. Any
ideas why the compression would not of increased.
Any suggestions would be appreciated.
Don Potter
