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I read through Junes revisions. I inserted my comments in the doc.

Hopefully I'm misreading it or June was sick while she wrote it.

P

----- Original Message -----
From: "June Mullins" <junemullins, earthlink dot net>
To: <antera, cryptofreak dot org>
Sent: Wednesday, October 17, 2001 3:01 PM
Subject: Arch doc (finally)!


> 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
>
>

• application/msword attachment: Software_Architecture-rev2.doc

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