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Conference smurf::ase

Title:ase
Moderator:SMURF::GROSSO
Created:Thu Jul 29 1993
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:2114
Total number of notes:7347

1858.0. "Minimum number of disks in an LSM disk group?" by DOOSJE::HERTA (For something fulfilled this hour, loved, or endured) Tue Feb 04 1997 15:08

According to the LSM requirements on p. 2-14 in the ASE Administration manual for V1.3,
"each disk group must have four to eight copies of the configuration and kernel log 
copies."

Does this imply that there need to be minimum four disks to a disk group?

Herta
T.RTitleUserPersonal
Name
DateLines
1858.1XIRTLU::schottEric R. Schott USG Product ManagementTue Feb 04 1997 15:568
Nope..

It would mean typically at least 2 disks...you can have 2 config copies
per disk (if you want).

regards

Eric
1858.2how?DOOSJE::HERTAFor something fulfilled this hour, loved, or enduredWed Feb 12 1997 14:239
Re.:.1
> ...you can have 2 config copies
> per disk (if you want).
Any type of disk?  How do you do that?

Is the statement that you "must have four to eight copies of the configuration 
and kernel log" per disk group a strong recommendation, or an obligation?

Herta
1858.3KITCHE::schottEric R. Schott USG Product ManagementThu Feb 13 1997 02:1020
>> ...you can have 2 config copies
>> per disk (if you want).
>Any type of disk?  How do you do that?
>
>Is the statement that you "must have four to eight copies of the configuration 
>and kernel log" per disk group a strong recommendation, or an obligation?

A strong recommendation (and if you have too few and lose them, don't
complain to us about losing data).

Read in the LSM docs about private areas, and nconfig nlog

you can see this on a system via sys_check

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

The example output system has lsm running...

>
>Herta
1858.4more specific doc pointer?DOOSJE::HERTAFor something fulfilled this hour, loved, or enduredThu Feb 13 1997 13:3634
Re:.3 Eric Schott
> Read in the LSM docs about private areas, and nconfig nlog

Eric,

Do you have a more specific pointer?  I have the "DEC OSF/1 Logical Storage 
Manager" manual, and the man pages, but the information there on the private
region is extremely limited, and I haven't found the nconfig nlog ones yet.
I know I can see the config and log using "voldisk list <device>", but it 
does not help me much in setting up a copy.

Basically, I'm setting up a two system ASE.  System 1 has four disks in rootdg
(system disk + swap mirrored).  System 2 has two disks in rootdg (system disk +
swap non-mirrored).
As far as I can make out using voldisk list <device>, I have the following copies

			config		log
system 1
  system disk 1		0		0
  system disk 2		0		0
  swap disk 1		1		1
  swap disk 2		2		2
system 2
  system disk 1		0		0
  swap disk 1  		1		1

Evidently, this is not a healthy situation, and I'd like to rectify it.  Can you
point me to documentation that will explain how to do this?

Herta

P.S. copying over sys_check now.  Looks nice.  We were going to write some 
     "census" procedures ourselves, and this is a great start.  Thanks for 
     sharing it.
1858.5another bug hit !!!BACHUS::DEVOSManu Devos DEC/SI Brussels 856-7539Thu Feb 13 1997 17:591
    
1858.6workaround?DOOSJE::HERTAFor something fulfilled this hour, loved, or enduredMon Feb 17 1997 06:333
Is it a bug or a supported feature? :-)

Any workarounds?