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Date: Fri, 31 Jan 1997 5:29:24 PST
From: "Marc L. Summers-SysAdmin" <marcs@tdd.hbo.nec.com>
To: cs911089@ariel.cs.yorku.ca
Subject: Re: Need comments on ClearCase
> Hi,
>
> My company is considering buying ClearCase. We have about 100 software
> developers and document writers. Project group size is 3 - 6 persons. On
> average we have 20 projects active. We have a mix of Sparc5, Sparc 20, and
> some PC. We use Solaris 2.5.x on a few machines. Most of the rest of sparc
run
> SunOs 4.1.x. The PCs run DOS, Win95, and WinNt.
We are currenly running ClearCase under SunOS 4.1.4
>
> I would like to know what is the impact of using ClearCase:
>
> 1. Any additional work needed in system admin? Percentage increae in
workload?
MAKE VERY CERTAIN, THAT YOU LOAD PATCH 102264-02
ON ALL OF YOUR SUNOS 4.1.4 SYSTEMS
NOTE: if you have 4.1.3U1 systems you will need to upgrade
them to 4.1.4
Also you will need to change your kernel maxusers value to at least
80
On my server I have maxusers set to 96
My server has 327 meg of swap, a Ross accelerator board
and is a Axil 320 system with a 166 meg processor in it.
It also has a 20 GIG raid system attached to it and is
running fast wide scsi. Believe me, you will need it,
all of it.
The patch 102264-02 is a kernel patch, if it is NOT loaded
first, the system will crash. When Clear case first came out here
to load their software, they did not load this patch and the
system crashed, and took out the /usr partition, it took some
time to recover.
> 2. Hardware/resources requirements on Server, and Client stations.
The operative word here is BIG!
We have Axil systems with 32 meg of main memory and
80 meg of swap, and they are all running out of resources.
I will have to upgrade all of our systems to at least
64 meg of main memory, and 160 meg of swap
Plan on at least a 2 gig drive per system, we currently have
one gig drives and they are not enough.
> 3. Increase in network traffic.
Make sure that you load the software LOCAL to each system
DO NOT LINK IT!, unless you have a 100megabit ethernet system
in place.
If you link it, it will tax your network.
To load the software local requires 56 meg of disk space
on each system.
> 4. Any VOB backup/restore issue?
I haven't run into any as yet.
> 5. Any file system management issue?
None that I have come across as yet.
> 6. Others.
>
> Comments from users also welcome.
Please feel free to contact: abramsp@tdd.hbo.nec.com
I am sure that he can fill you in on the user aspect of
the software.
I am commenting purely from an administration standpoint.
Hope that helps.
-- + ------------------------------------------------- + + +++ N E C +++ +++ A M E R I C A +++ + + ------------------------------------------------- + + Marc L. Summers System Administrator + + 3100 N.E. Shute Road Hillsboro Oregon 97124 + + PH: 1-503-681-3338 FAX: 1-503-681-3304 + + Email: marcs@tdd.hbo.nec.com + + ---------- Sic transit gloria mundi. ------------ + + --- "Thus passes away the glory of the world." -- + + ------------------------------------------------- +<----RFC822 headers----- Received: from red.ariel.cs.yorku.ca ([130.63.104.32]) by alpha.xerox.com with SMTP id <17067(4)>; Sat, 1 Feb 1997 10:43:46 PST Received: by ariel.cs.yorku.ca (8.6.12/YU_CS_869.1.2.Ariel) id NAA11641; Sat, 1 Feb 1997 13:43:42 -0500 Received: from blue by red with SMTPD id <11640>; Sat, 01 February 1997 13:43:42 -0500 From: Jason Keltz <cs911089@red.ariel.cs.yorku.ca> X-Sender: cs911089@blue MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII -----RFC822 headers---->
---------- Forwarded message ---------- Date: Fri, 31 Jan 1997 07:16:48 -0500 (EST) >From: "Richard C. Mills" <rmills@atl1.america.net> To: cs911089@ariel.cs.yorku.ca Subject: Re: Need comments on ClearCase
Hello,
> 1. Any additional work needed in system admin? Percentage increae in workload?
Depends on the setup. I would say startup takes some time, but afterwards admin time is minimal.
> 2. Hardware/resources requirements on Server, and Client stations.
Depends on the amount of code and exactly how you set it up. We had 4 IBM AIX machines, and 1 Sparc 20 (Solaris) as our servers. The client setup can be as small as 1 meg.
> 3. Increase in network traffic.
Depending on the amount of clients setup and how often they need to access the server. It can cause quite a load on your network.
> 4. Any VOB backup/restore issue?
Definitely. This part can get fairly hairy. And is very much involved with your next question.
> 5. Any file system management issue?
I would recommend setting up mirroring. In order to backup a VOB to tape, you will need to shutdown clearcase on that server first.
This was all about 7 months ago. The company I'm at now is about to jump into ClearCase also, so I'll be working these same issues again. Let me know if you have some more questions. If I don't know, I can probably find out.
Good luck,
Richard -- ------------------------------------------------------------------------------ Richard Mills - rmills@fair.net ------------------------------------------------------------------------------
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---------- Forwarded message ---------- Date: Fri, 31 Jan 1997 07:10:56 -0500 >From: Caleb Warner <cwarner@slpma8.ed.ray.com> To: cs911089@ariel.cs.yorku.ca Subject: Re: Need comments on ClearCase
Those are all good questions and I wish I had the answers! Anyway we are implementing Clearcase here. We have approximately 300 developers that we are transitioning. We created a designated clearcase administrator who is is responsible for all clearcase problems. We also have setup special view and vob servers. We have not yet measured increases in network traffic. There are some issues with backups, but we have not attempted to tackle that problem yet. I believe there is some information on the atria web page (www.pureatria.com) about backups.
Thanks
Caleb Warner Raytheon Company
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