[OpenAFS] fs newcell / clients CellServDB / adding new db server

[Jeffrey Altman]

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On 6/15/2018 9:52 AM, Andreas Ladanyi wrote:
> ok. so the process of change CellSrvDB on db servers and bos restart AN=
D
> updating (copying) new CellServDB to clients has to be done in a very
> short time to minimize timeout symptoms for users, because db servers
> has to be in sync and ubik coordinator has to be elected and the afs
> clients with new CellServDB with the new db server (lowest ip) asks the=

> new db server (ubik coordinator) first.

The ubik clients do not rank servers based upon IP address.  What they
do is:

1. compute the length of the ordered server list

  A B C D

2. then generate a random number from 0..<length - 1>

3. use that number as an index into the list to decide which is first

4. and reorder the list as if it were a circular queue.  So if the
random number selected was 2, then the list would become

  C D A B

The only time the coordinator must be contacted is for a write
transaction.  All read transactions are processed by the first server
contacted.

My conclusion is that there is something about your cell configuration
that results in a write transaction for each token requested.  For exampl=
e:

 1. cell name:     		example.com

 2. One of the following is true:

    a. realm name: 		AD.EXAMPLE.COM

    b. CellServDB's zeroth ubik server host domain:

   				subnet.example.com

 3. auto-registration of foreign PTS IDs enabled:

    a. pam_afs_session configuration doesn't disable it

    b. aklog executed without -noprdb

If the "realm of cell" guessing algorithm decides that the current login
is likely to be a foreign cell login, then an attempt to allocate a PTS
ID for the authentication name will be performed.  This request is a
write transaction and the ubik client will attempt to contact every ubik
server in order until the coordinator is determined.

Jeffrey Altman


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fn:Jeffrey Altman
n:Altman;Jeffrey
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adr:Suite 6B;;255 West 94Th Street;New York;New York;10025-6985;United St=
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email;internet:jaltman@auristor.com
title:Founder and CEO
tel;work:+1-212-769-9018
note;quoted-printable:LinkedIn: https://www.linkedin.com/in/jeffreyaltman=
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