[rescue] Solaris ZFS questions

Zachary Giles zgiles at gmail.com
Wed Jan 19 16:40:53 CST 2011

OK. I'm good with that. I do a scrub regularly cuz I was told it was a Good
Thing (TM). But of course, it would be silly if it was only protected after
a scrub. So, I'm glad we cleared that up. :) Currently have about 30TB on
ZFS. .. not that much, but enough not to lose it

On Wed, Jan 19, 2011 at 3:37 PM, Phil Stracchino <alaric at metrocast.net>wrote:

> On 01/19/11 17:29, Zachary Giles wrote:
> >>From Wikipedia (not the best source..but it's ok):
> > "ZFS uses a copy-on-write transactional object model. All block pointers
> > within the filesystem contain a 32-bit checksum or 256-bit hash
> [shortened]
> > of the target block which is verified when the block is read."
> >
> > Sounds like If you access a file, it checks the sum. Looks like the only
> > reason to do a scrub is to find out sooner. If there are errors, it will
> fix
> > them if it's a scrub or a read, and probably report neither if it's
> > correctable. Is that right?
> Pretty much.  The point being of course to find errors BEFORE you need
> the tile, and hopefully while you still have the ability to repair it.
> It's one more layer (early detection) of protection.
> --
>   Phil Stracchino, CDK#2     DoD#299792458     ICBM: 43.5607, -71.355
>  alaric at caerllewys.net   alaric at metrocast.net   phil at co.ordinate.org
>         Renaissance Man, Unix ronin, Perl hacker, Free Stater
>                 It's not the years, it's the mileage.
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Zach Giles
zgiles at gmail.com

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