On Oct 1, 2009, at 7:10 AM, Ray Clark wrote:
Darren, thank you very much! Not only have you answered my
question, you have made me aware of a tool to verify, and probably
do alot more (zdb).
Can you comment on my concern regarding what checksum is used in the
base zpool before anything is created in it? (No doubt my
terminology is wrong, but you get the idea I am sure).
The single critical feature of ZFS is debatably that every block on
ZFS is checksummed to enable detection of corruption, but it appears
that the user does not have the ability to choose the checksum for
the highest levels of the pool itself. Given the issue with
fletcher2, this is of concern! Since this "activity" was kicked off
by a "Corrupt Metadata" ZFS-8000-CS, I am trying to move away from
fletcher2. Don't know if that was the cause, but my goal is to
restore the "safety" that we went to ZFS for.
Is my understanding correct?
Are there ways to control the checksum algorithm on the empty zpool?
You can set both zpool (-o option) and zfs (-O option) options when you
create the zpool. See zpool(1m)
-- richard
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