So does you guys have any thoughts or opinions on this subject?
kabau
On Sun, Aug 18, 2002 at 08:08:44PM -0500, Damon Conway wrote:
> On Mon, Aug 19, 2002 at 12:22:38AM +0100, Colin Morey wrote:
> > Do we have a defined number of minimum connections a server should
> > allow? or are we basing on an had hoc basis, based upon transit and
> > availability as well?
>
> That is an excellent question, and one I've yet to find a good answer
> for. It is my opinion that we cannot afford to be too picky when
> someone offers their services to us, but it also doesn't help to have
> servers out there that can't perform. Unfortunatly, I've been too busy
> with life to give this matter much thought.
>
> The way I see it, we have three basic requirements for rsync mirrors.
>
> 1. Enough available bandwidth to serve a substantial amount of data.
>
> 2. Accurate and timely data.
>
> 3. Sufficient number of simultaneous logins to allow enough people to
> actually use the mirror.
>
> I would suggest that the mirror have at least a T1 of available
> bandwidth. It doesn't have to dedicate the entire T1 to rsync
> mirroring, but if all they have is ISDN, DSL, or cable, then they aren't
> going to be pleased with rsync using all of their bandwidth. I would
> suggest a minimum 128kb/s of available bandwidth for rsync bandwidth on
> a mirror. This number would be better at 256kb/s, but 128kb/s should be
> usable.
>
> Some method needs to be developed for making sure that mirrors are updated
> in a timely fashion, and have accurate copies of the master. There have
> been several reports of out-of-date and bad data on mirrors. Right now,
> we have people updating their mirror every 30 minutes on the 0 and 30.
> This will quickly become inadequate if we continue to grow our number of
> mirrors. Keeping an infrastructure like this healthy as it grows will
> probably be the biggest task this admin team will face. I have lots of
> ideas on this, but they can wait until we get some basic parameters down
> for mirrors. Right now, it should be sufficient to develop an automated
> system that checks for inaccurate and out of sync mirrors.
>
> The third item seems to be the big point everyone is interested in, and
> in my opinion the least of our worries. However, I'm tired of hearing
> people whine about it so I've given it some thought. This ties into
> item one since the more people you have using a server, the more
> bandwidth you need. I think we should have ratios of bandwidth to
> max concurrent users. Maybe 5 users for every 128kb/s of available
> bandwidth. Basically, to determine these numbers we need to determine
> the average user's rsync transfer, and come up with an average sustained
> data rate for an rsync transfer.
>
> Now, these are just my opinions. What do y'all think?
>
> Damon/kabau
>
>
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