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Conference decwet::advfs_support

Title:AdvFS Support/Info/Questions Notefile
Notice:note 187 is Freq Asked Questions;note 7 is support policy
Moderator:DECWET::DADDAMIO
Created:Wed Jun 02 1993
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1077
Total number of notes:4417

1028.0. "Initial mkfdmn values (where?)" by GYRO::faux.zko.dec.com::skinner (Internet Business Group) Wed Mar 26 1997 15:52

Hi,

I received a call today from an internal test group that was testing
INN 1.4 on our platforms with regard to its reliability. We shipped 
INN 1.4 as part of the Internet AlphaServer kit. FWIW, we are now 
shipping 1.5.1.

INN was throttling itself because of "no space left on device".
When the engineer running the test did the usual df commands,
there was plenty of space.

I have very limited knowledge of advfs. In fact, we don't recommend
that customers use adfvs for the /var/spool/news area. Sorry.
I have been told too many times about the problems with the
metafile. We ARE very interested in recommending adfvs though. 
The mkfdmn man page was very helpful. I can be convinced.

I've read about the -p and -x switches in the mkfdmn. Is there a way
you can tell what values were used when the file domain was first
created? 

Dumb question, if you use the -p switch and preallocate based on
the table in the man page, will the BMT still extend itself?

Is the Admin Guide on the internal net somewhere?

Thanks in advance,

Shari
T.RTitleUserPersonal
Name		DateLines
1028.1No way to find initial values?GYRO::faux.zko.dec.com::skinnerInternet Business GroupMon Mar 31 1997 13:043
I take it this means no?

Shari
1028.2I can't be of much helpUNIFIX::HARRISJuggling has its ups and downsMon Mar 31 1997 13:369
    Just guessing myself, but I would expect the -p value to be used during
    the creation and then thrown away since it isn't needed anymore.  The
    -x must be around somewhere since it is needed each time the BMT needs
    to be extended.  The question is where?  I don't know the answer to
    that.
    
    Just a guess.
    
    					Bob Harris
1028.3you can use vbmtpg to find the valuesDECWET::DADDAMIODesign Twice, Code OnceMon Mar 31 1997 14:4622
    I think I found out the information wanted in .0. You should run vbmtpg
    (in /sbin/advfs) and look at page 0 of the BMT (the command should be
    similar to: /sbin/advfs/vbmtpg /dev/rrz0g but with the device of the
    first volume substituted).
    
    Scan down the output for CELL 4 then a record of type BSR_VD_ATTR (it
    was record 0 on my domain, but I don't know if it's always record 0 of
    cell 4). The value for -x should be given in the bmtXtntPgs field.
    
    Scan down to CELL 6 and look at the first 2 entries in the extents
    array. They look like:
    
    bsXA[ 0] bsPage    2 vdblk xxxx
    bsXA[ 1] bsPage nnnn vdblk yyyy
    
    To get the value that was use for the -p option, subtract the page
    number of the first element (i.e. 2) from the page number of the second
    (shown by nnnn in my example above).
    
    Hopefully someone will correct me if I got this wrong.
    
    						Jan
1028.4KITCHE::schottEric R. Schott USG Product ManagementTue Apr 01 1997 18:1910
You can see the value of the extension size by looking at
the showfile -x M-6  
M-12..etc


sys_check has examples of doingthis...

see http://www-unix.zk3.dec.com/tuning/tools/sys_check/sys_check.html