Someone needs to write an i/o agent, so U2 can be used with products like
Double-Take and keep record level integrity. Anyone with c++ experience out
there?
----- Original Message -----
From: "Address" <[email protected]>
To: "U2 Users List" <[email protected]>
Sent: Wednesday, December 09, 2009 9:33 AM
Subject: Re: [U2] Unidata 6.1 Replication
We are using Double-Take to replicate.
--- On Wed, 12/9/09, BraDav <[email protected]> wrote:
From: BraDav <[email protected]>
Subject: Re: [U2] Unidata 6.1 Replication
To: "U2 Users List" <[email protected]>
Date: Wednesday, December 9, 2009, 8:33 AM
Kevin,
I would not use replication for U2 for 6x. I was
given the mandate to use then IBM replication at a company I
used to work for, and it didn't work. It wasn't on problem,
but a whole hosts of problem. I set up two test boxes
four different times and tested it. The 4th time I had
30 people from then IT staff (I was part of the staff then)
hammer on it. Then we went live. It worked for 4 days
then crashed the whole system. Then it worked for a
few hours. Then, it kept crashing (hanging the
servers). We had to pull it out. We were on
Unidata, but it's the same code base.
I can only say that if you want to go ahead with it, find
someone who's using it successfully, and find out what
environment they're in, version, ect. It's based on
Unix and has different issues on different O/Ss. But,
personally, I'd try RFS first, or write your own.
That's what we ended up doing. And it worked. We
used triggers and hammered the system 24/7. There were some
issues, but we worked them all out, and we're able to
process millions of transactions per day. What we
ended up doing is finding all the weak spots in Unidata and
avoiding them. The biggest weak spot was locks.
The system couldn't hanldle the million+ locks per
day. I went to double buffering, avoiding locks (an
old GUI technique!). Also, I had to convert types of
records to hex, and the UD hex conversion is
slow. It's amazing what works in UD and
scales, and what doesn't. To write one's own takes
time and is expensive. I think that using mirrored
drives is better!!! RFS???
Brad
----- Original Message ----- From: "Kevin King" <[email protected]>
To: "U2 Users List" <[email protected]>
Sent: Tuesday, December 08, 2009 12:22 PM
Subject: [U2] Unidata 6.1 Replication
> Is replication solid and functional in Unidata
6,1? Anyone using it with
> roaring success?
>
> -Kevin
> http://www.PrecisOnline.com
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