SUMMARY: AdvFS BMT parameters

From: Kenneth Forward <kforward_at_crosby.physics.mun.ca>
Date: Mon, 06 Apr 1998 15:26:29 -0230 (NDT)

Thanks to Girish Phadke, who explained how to use showfile(8) to
reveal a domain's BMT increment size.

First cd to the .tags directory under an existing fileset in the
domain, eg,

# cd /usr/.tags

then

# showfile -x M-6

The output will resemble the following,

           Id Vol PgSz Pages XtntType Segs SegSz Log Perf File
  fffffffa.0000 1 16 2050 simple ** ** ftx 100% M-6

      extentMap: 1
          pageOff pageCnt vol volBlock blockCnt
                0 2 1 32 32
                2 128 1 8816 2048
              130 128 1 130128 2048
              258 128 1 347856 2048
               : : : : :

The second and subsequent 'pageCnt' values equal the BMT increment (or
'-x' parameter) with which the domain was created - in this case, the
default value of 128. I then used this value to voladd additional
space to my usr domain (see original post below).

Thanks again Girish! Cheers,

---
Kenneth Forward,
Research Computing Specialist
Department of Physics and Physical Oceanography
Memorial University of Newfoundland
On Mon, 30 Mar 1998, Kenneth Forward wrote:
> Managers,
> 
> Q: How can I deduce the -x and/or -p parameters a file domain was created
>    with ?
> 
> I wish to add another volume to a domain which predates my administration
> of this box, and for optimum performance would like to 'addvol' it using
> the same, presently unknown, parameters. 
> 
> Box is running DU4.0B with patch kit 6 installed.  
> 
> Advanced apologies if the answer is obvious, I am new to AdvFS.
> 

Received on Mon Apr 06 1998 - 19:58:13 NZST