Re: Efficient way to import snapshots?

On Tue, 31 Jul 2007, Craig Boston wrote:

I just so happen to be rebuilding the zfs pool on that server this
morning in order to add more swap, so your wish(1tcl) is my rcmd(3).

You, sir, are a total geek.

I'm not sure if that's a compliment or a curse.

Same machine, on a UFS filesystem (single disk, since zfs was doing the
RAID), with the cache tuning parameters reset back to defaults:

First 'git status' after a reboot:
git status  2.23s user 2.23s system 17% cpu 24.987 total

Second:
git status  1.81s user 1.34s system 98% cpu 3.188 total

Third:
git status  1.76s user 1.45s system 98% cpu 3.252 total

So I definitely think the problem is just that with its increased
overhead, ZFS simply can't keep all the metadata in the cache with the
available memory.

Very interesting. And thanks. The whole "ZFS is great" internet meme seems 
to be partly due to not a lot of people having used or compared it in real 
life. I'm sure it's wonderful for some things, but it clearly does have a 
lot of downsides too. 

			Linus