On 12 Oct 2006, at 17:16, Douglas Garstang wrote:
-----Original Message-----
From: Dovid B [mailto:[EMAIL PROTECTED]
Sent: Thursday, October 12, 2006 8:14 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] How big is *your* dialplan??
I worked for some one that installed servers. He has several
fully built
machines with clean installs ready to go if a client needs a
"loaner".
I guess I'm just not getting it. Sorry. Even if I was an
enterprise, not a carrier, I wouldn't want to rely on a server not
failing, given that the mtbf between failures on a server is going
to be higher than a specialised PBX.
It's a money vs risk thing.
We did an install for a client, they were all for dual-redundant set-up.
I asked them what the maximum acceptable downtime was, and what this
would
cost them.
The answer was that 4 hours no more than once every 2 years was ok,
and would
cost them a couple of thousand pounds.
I told them to stick with quality hardware, get a maintenance
contract and keep a
spare in the cupboard. They have been happy ever since.
Another client insisted they needed minimal downtime and opted for
clustered
hardware (this was a web/database/telephony system but not asterisk).
In the first 2 years they experienced more downtime than the first
client.
Both of their failures were complexity related - the first being a
failing router
that then poisoned the rip-tables of it's failover buddy. The second
failure
still makes me laugh, they didn't pay the license on their super-
duper-journaling NAS
system which expired taking out the whole cluster :-)
My point being that high up times are hard to attain and simpler is
often best.
As to MTBF, quality shows, we have just (reluctantly) rebooted a
decently constructed
database server with an uptime of 850 days to add a disk, it's
previous reboot
was to add a new tape drive, to my knowledge it has been in service
for > 5 years.
How long do companies keep their phone systems ? 5 years on average ?
Tim Panton
www.mexuar.com
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