Re: [OpenAFS] AFS lag

2009-05-27 Thread Ken Hornstein
I'm no ubik engineer, but as far as I understand it, the protocol was not designed for even numbers of participating servers. For best results, three or five servers seem to be optimum. I hear this frequently, and don't see why it should be true. The tie breaking mechanism during an election is

Re: [OpenAFS] AFS lag

2009-05-26 Thread Kim Kimball
Derrick Brashear wrote: On Wed, Mar 18, 2009 at 9:56 PM, Ken Hornstein k...@cmf.nrl.navy.mil wrote: I'm no ubik engineer, but as far as I understand it, the protocol was not designed for even numbers of participating servers. For best results, three or five servers seem to

Re: [OpenAFS] AFS lag

2009-03-19 Thread Ken Hornstein
There is a lot of misinformation about Ubik out there; the voting protocol is actually not complicated, it's just not documented well. it's actually well-documented, if you find Kazar's paper on Quorum Completion. You know, we should try to find a copy of that and put it somewhere useful. From

Re: [OpenAFS] AFS lag

2009-03-18 Thread Felix Frank
On Wed, 18 Mar 2009, Abdelkader El mastour wrote: Configuration Netbsd4 heimdal1.1 arla You have Arla clients? Openafs 1.4.5 via pkgsrc replicated root.afs root.cell RO 1000 user per server 10 servers for fileserver. 2 servers for vlserver and ptserver This is not good. I've recently

Re: [OpenAFS] AFS lag

2009-03-18 Thread Abdelkader El mastour
On Wed, Mar 18, 2009 at 2:54 PM, Derrick Brashear sha...@gmail.com wrote: On Wed, Mar 18, 2009 at 5:35 AM, Abdelkader El mastour a.elmast...@gmail.com wrote: Configuration Netbsd4 heimdal1.1 arla Openafs 1.4.5 via pkgsrc replicated root.afs root.cell RO 1000 user per server

Re: [OpenAFS] AFS lag

2009-03-18 Thread Abdelkader El mastour
-ad...@openafs.org [mailto: openafs-info-ad...@openafs.org] On Behalf Of Felix Frank Sent: Wednesday, March 18, 2009 4:15 AM To: Abdelkader El mastour Cc: openafs-info@openafs.org Subject: Re: [OpenAFS] AFS lag On Wed, 18 Mar 2009, Abdelkader El mastour wrote: Configuration Netbsd4

Re: [OpenAFS] AFS lag

2009-03-18 Thread Felix Frank
I agree with Abdelkader and would recommend having at least 3 database servers. You could be walking on very thin ice with just 2. Whats the reason for this ? I'm no ubik engineer, but as far as I understand it, the protocol was not designed for even numbers of participating servers. For best

Re: [OpenAFS] AFS lag

2009-03-18 Thread Ken Hornstein
I'm no ubik engineer, but as far as I understand it, the protocol was not designed for even numbers of participating servers. For best results, three or five servers seem to be optimum. There is a lot of misinformation about Ubik out there; the voting protocol is actually not complicated, it's

Re: [OpenAFS] AFS lag

2009-03-18 Thread Derrick Brashear
On Wed, Mar 18, 2009 at 9:56 PM, Ken Hornstein k...@cmf.nrl.navy.mil wrote: I'm no ubik engineer, but as far as I understand it, the protocol was not designed for even numbers of participating servers. For best results, three or five servers seem to be optimum. There is a lot of misinformation