Preface: yes, shrink will be cool. But we've been running highly
available,
mission critical datacenters for more than 50 years without shrink being
widely available.
On Aug 5, 2009, at 9:17 AM, Martin wrote:
You are the 2nd customer I've ever heard of to use shrink.
This attitude seems to be a common theme in ZFS discussions: "No
enterprise uses shrink, only grow."
Maybe. The enterprise I work for requires that every change be
reversible and repeatable. Every change requires a backout plan and
that plan better be fast and nondisruptive.
Do it exactly the same way you do it for UFS. You've been using UFS
for years without shrink, right? Surely you have procedures in
place :-)
Who are these enterprise admins who can honestly state that they
have no requirement to reverse operations?
Backout plans are not always simple reversals. A well managed site will
have procedures for rolling upgrades.
Who runs a 24x7 storage system and will look you in the eye and
state, "The storage decisions (parity count, number of devices in a
stripe, etc.) that I make today will be valid until the end of time
and will NEVER need nondisruptive adjustment. Every storage
decision I made in 1993 when we first installed RAID is still
correct and has needed no changes despite changes in our business
models."
My experience is that this attitude about enterprise storage borders
on insane.
Something does not compute.
There is more than one way to skin a cat.
-- richard
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