On Tue, May 31, 2011 at 6:08 AM, Gertjan Oude Lohuis
<gert...@oudelohuis.nl> wrote:
> "Filesystem are cheap" is one of ZFS's mottos. I'm wondering how far
> this goes. Does anyone have experience with having more than 10.000 ZFS
> filesystems? I know that mounting this many filesystems during boot
> while take considerable time. Are there any other disadvantages that I
> should be aware of? Are zfs-tools still usable, like 'zfs list', 'zfs
> get/set'.
When we initially configured a large (20TB) files server about 5
years ago, we went with multiple zpools and multiple datasets (zfs) in
each zpool. Currently we have 17 zpools and about 280 datasets.
Nowhere near the 10,000+ you intend. We are moving _away_ from the
many dataset model to one zpool and one dataset. We are doing this for
the following reasons:
1. manageability
2. space management (we have wasted space in some pools while others
are starved)
3. tool speed
I do not have good numbers for time to do some of these operations
as we are down to under 200 datasets (1/3 of the way through the
migration to the new layout). I do have log entries that point to
about a minute to complete a `zfs list` operation.
> Would I run into any problems when snapshots are taken (almost)
> simultaneously from multiple filesystems at once?
Our logs show snapshot creation time at 2 seconds or less, but we
do not try to do them all at once, we walk the list of datasets and
process (snapshot and replicate) each in turn.
--
{--------1---------2---------3---------4---------5---------6---------7---------}
Paul Kraus
-> Senior Systems Architect, Garnet River ( http://www.garnetriver.com/ )
-> Sound Coordinator, Schenectady Light Opera Company (
http://www.sloctheater.org/ )
-> Technical Advisor, RPI Players
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