Glaser, David wrote:
>
> Hi all,
>
> I have a Thumper (ok, actually 3) with each having one large pool, 
> multiple filesystems and many snapshots. They are holding rsync copies 
> of multiple clients, being synced every night (using snapshots to keep 
> ‘incremental’ backups).
>
> I’m wondering how often (if ever) I should do scrubs of the pools, or 
> if the internal zfs integrity is enough that I don’t need to do manual 
> scrubs of the pool? I read through a number of tutorials online as 
> well as the zfs wiki entry, but I didn’t see anything very pertinent. 
> Scrubs are I/O intensive, but is the Pool able to be used normally 
> during a scrub? I think the answer is yes, but some confirmation helps 
> me sleep at night.
>

We did a study on re-write scrubs which showed that once per year was a
good interval for modern, enterprise-class disks. However, ZFS does a
read-only scrub, so you might want to scrub more often.

> Thoughts? Ideas? Knife-fights?
>

Knife fights? Naw, more like "paranoia will destroy ya" :-)
Maybe we need a ZFS theme song :-)
http://www.youtube.com/watch?v=g3OVaCDLc9M
http://www.youtube.com/watch?v=ZBbAZVw3_7A
-- richard

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