Exabyte Mammoth tape type?

2001-04-19 Thread Carey Jung 

Hi,

Anybody got a tapetype spec for an Exabyte Mammoth tape (not Mammoth-2) that
they would kindly share?  How about some heuristics for a "good guess" at
parameters?  Running the tapetype program seems to take hours, even days.

thanks,
Carey





Carey Jung
IT Freedom
[EMAIL PROTECTED]
512.419.0070, fax 419.0080

Re: Exabyte Mammoth tape type?

2001-04-19 Thread Ross Johnson 

Hi,

The three parameters you need can be easily obtained or estimated.

For no hardware compression:-

length 2 mbytes # Raw length using 170m AME tape
# (use up to 4 mbytes with hw compression)
filemark 95 kbytes  # From the Mammoth spec document
# (long filemarks to nearest kbyte)
speed 3000 kbytes   # Max transfer rate from spec
# (up to 6000 kbytes with compression)

These parameters don't appear to be critical if not exact. I think they
are used mostly by amanda for estimation, and to report the percent
tape used, etc. Speed and length using hw compression will be modified
based on your local experience.

Hope this helps.

Ross Johnson

Carey Jung wrote:
 
 Hi,
 
 Anybody got a tapetype spec for an Exabyte Mammoth tape (not Mammoth-2) that
 they would kindly share?  How about some heuristics for a "good guess" at
 parameters?  Running the tapetype program seems to take hours, even days.
 
 thanks,
 Carey
 
 
 
 
 Carey Jung
 IT Freedom
 [EMAIL PROTECTED]
 512.419.0070, fax 419.0080

RE: Exabyte Mammoth tape type?

2001-04-19 Thread Carey Jung 

Much appreciated, Ross.  I didn't realize that the length should be the
'actual' length, when using s/w compression, but that makes sense, when I
think about it.

 -Original Message-
 From: [EMAIL PROTECTED]
 [mailto:[EMAIL PROTECTED]]On Behalf Of Ross Johnson
 Sent: Thursday, April 19, 2001 8:04 PM
 To: Carey Jung
 Cc: Amanda Users
 Subject: Re: Exabyte Mammoth tape type?


 Hi,

 The three parameters you need can be easily obtained or estimated.

 For no hardware compression:-

 length 2 mbytes   # Raw length using 170m AME tape
   # (use up to 4 mbytes with hw compression)
 filemark 95 kbytes# From the Mammoth spec document
   # (long filemarks to nearest kbyte)
 speed 3000 kbytes # Max transfer rate from spec
   # (up to 6000 kbytes with compression)

 These parameters don't appear to be critical if not exact. I think they
 are used mostly by amanda for estimation, and to report the percent
 tape used, etc. Speed and length using hw compression will be modified
 based on your local experience.

 Hope this helps.

 Ross Johnson

 Carey Jung wrote:
 
  Hi,
 
  Anybody got a tapetype spec for an Exabyte Mammoth tape (not
 Mammoth-2) that
  they would kindly share?  How about some heuristics for a "good
 guess" at
  parameters?  Running the tapetype program seems to take hours,
 even days.
 
  thanks,
  Carey
 
 
 --
 --
  
 
  Carey Jung
  IT Freedom
  [EMAIL PROTECTED]
  512.419.0070, fax 419.0080