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Subject: RE: SW Development Analysis of Proposed Availability Initiative
Date: Fri, 13 Apr 2007 08:37:24 -0700
Message-ID: <BB375AF679D4A34E9CA8DFA650E2B04E034366AC@onstor-exch02.onstor.net>
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Thread-Topic: SW Development Analysis of Proposed Availability Initiative
Thread-Index: Acd9ZJ6Ll53cVhYeRpWdW5VFuzbY+AAGGZNAABjr7WA=
From: "Jay Michlin" <jay.michlin@onstor.com>
To: "Jerry Lopatin" <jerry.lopatin@onstor.com>,
	"Paul Hammer" <paul.hammer@onstor.com>
Cc: "Tim Gardner" <tim.gardner@onstor.com>,
	"Charissa Willard" <charissa.willard@onstor.com>,
	"Maxim Kozlovsky" <maxim.kozlovsky@onstor.com>,
	"Andy Sharp" <andy.sharp@onstor.com>,
	"Brian DeForest" <brian.deforest@onstor.com>

Jerry,

eek is quite a tedious set of algorithms and processes. For most of what
it does, it has to go through literally everything, with cross-checking
and sanity checks at every step. So on a multi-terabyte file system, and
particularly one with lots of inodes and metadata, eek is doomed to run
a long time.

There are various creative approaches to making it faster, and we've
implemented some and will implement more. Some form of online eek is
also a great help because it allows users to interactively direct the
program to work on subsets of the files rather than exhaustively
scanning everything.

As Jobi commented in an email exchange earlier this week, we may be able
to do some things online with eek already, subject to rollout and
packaging, though we can't do repair in that mode. I expect we'll look
for ways to exploit that in Zonda to bring some quick value to the field
and to customers.

jay


-----Original Message-----
From: Jerry Lopatin=20
Sent: Thursday, April 12, 2007 8:37 PM
To: Jay Michlin; Paul Hammer
Cc: Tim Gardner; Charissa Willard; Maxim Kozlovsky; Andy Sharp; Brian
DeForest
Subject: Re: SW Development Analysis of Proposed Availability Initiative

Jay,

This is very good.

Just wondering:  if we defer the work on disk spin-down, can we get to
the 1 hour eek goal?

Jerry
--------------------------
Sent from my Blackberry; please excuse my typing!=20

-----Original Message-----
From: Jay Michlin
To: Jerry Lopatin; Paul Hammer
CC: Tim Gardner; Charissa Willard; Maxim Kozlovsky; Andy Sharp; Brian
DeForest
Sent: Thu Apr 12 17:42:31 2007
Subject: SW Development Analysis of Proposed Availability Initiative

Attached Word document.
