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From: June Mullins (junemullins, earthlink dot net) Date: 2001.10.17 - 15.01 MDT
My apologies for taking so long - I was babying myself with my cold.
It's almost all better now.
I just made a few changes to the arch doc, which I hope make it more
clear. I added back some
of Perry's words from his original arch doc, because I felt the new
version was kind of too vague
about what we are actually trying to build. I also added examples in
some places for the same
reason. Finally, I changed Data Manager to Request Manager, because
Persistent Data Manager
is too confusing close to Data Manager. If anybody can think of a
better name, that's fine too. I'd
appreciate comments and amendments to the doc. Even though you guys did
a great job of
explaining the architectural changes you made while I was gone, I'm sure
I could have missed some
important points.
Here are some questions we came up with last meeting:
- Is there a problem with timeouts when we need to restore a file from
tape? Do we block on open,
and wait until the entire file is restored? Do we block on read, and
wait only until we can satisfy the
read (i.e., continue to restore the file in the background)? Jay,
would it be hard for you to run some
experiments with your current driver code - put in a sleep before
responding to reads or opens, and
see what happens with CIFS, NFS, or local requests?
- Can we (should we) take advantage of HSM-aware applications?
- Do we need dynamically expandable storage? With RAID protection?
- Would it be reasonable to require the customer to have a tape library
with more than one tape drive?
Two tape drives would be useful for autorestore during disaster recovery.
- We need to know more about what the different management policies
would be.
- What do we want to build for a prototype?
I also want everyone to know that I am single-handedly responsible for
driving up the price of
Tricord stock. I sold all my stock Monday at $1.20. It is now $1.74.
It galls me that I did
something useful for Tricord.
Don't forget - we have a meeting next Tuesday at the library at 1:30.
Kevin and Brian - are you employed yet?
June
This archive was generated by hypermail 2b30 : 2001.10.18 - 03.00 MDT |
