Message-Id: <199707181536.IAA07251@mailhost1.cac.washington.edu> From: "James W DeRoest" <deroest@cac.washington.edu> To: "AST Webpage" <astweb@u.washington.edu> Subject: new homers/mailers/raid disk Date: Fri, 18 Jul 1997 08:36:17 -0700
-----Original Message----- From: Eliot Lim <eliot@u.washington.edu> To: Douglas Luft <dbluft@u.washington.edu>; Thomas W Remmers <remmers@u.washington.edu> Cc: aley@cac.washington.edu <aley@cac.washington.edu>; Tom Hammond <thammond@cac.washington.edu>; jim deroest <deroest@cac.washington.edu>; Ken Lowe <ken@u.washington.edu>; Yonah Karp <yonah@u.washington.edu> Date: Thursday, July 17, 1997 5:55 PM Subject: new homers/mailers/raid disk
>
>the new raid disks as well as new E30 h/w have arrived. these were
>ordered to provide fault tolerance for user mailboxes.
>
>- doug will be setting the raid disks up in the new homer rack on those
>19 inch racks that were set aside for the original 18 mailers.
>
>- since the email servers are the most heavily loaded piece of the homer
>cluster, it makes sense to use the latest and most powerful machines for
>the job to beef up overall performance of the cluster. hence the current
>plan is to install the 10 new E30s as mailers.
>
>- before we actually install all 10 new E30s we will be installing just
>one or two mailers for a test production period just to make sure that the
>new raid disks perform as advertised. we will hold off full deployment
>until we are satisfied about the performance.
>
>- if the trial run is successful we will finish installing all 10 new
>mailers.
>
>- at the same time we will be migrating users from the older mailers to
>the new ones.
>
>- this would be a good time to move the remaining people off franklin and
>make them the test subjects.
>
>- we will then recycle the old mailers into new homers. these "new"
>homers will be installed in the same new rack as where the new h/w is
>currently located. (i understand that we want to move more homers into the
>new fast ethernet switch, right?) we will gradually vacate the current
>mailer rack and free up the space for somebody else.
>
>- since the new homers will now be 250 "pizza boxes" instead of the tall
>E30s, we may want to use 19 inch racks instead of 24 inch ones. i
>personally do not have a preference one way or another but ron and tom may
>have an opinion about this since some wiring is already in place.
>
>
>down the road stuff:
>
>- the raid disks will take up to 18 CPUs since that is the number of
>mailers that we have. i feel that we should continue to dedicate the most
>powerful h/w for the mailers, thus:
>
>- convert existing E30 homers (homer32-39) into the remaining 8 mailers
>and migrate them into the new fast ethernet rack.
>
>- convert the freed up model 250 mailers into homers.
>
>- this will depend on whether we have enough spare FWD SCSI adapters for
>the E30s and if not will there be the $$$ to get more?
>
>
>
>please let me know if you see any glaring problems with this plan.
>
>
>eliot
>
>
>