On Wed, May 4, 2011 at 10:15 PM, Edward Ned Harvey < opensolarisisdeadlongliveopensola...@nedharvey.com> wrote:
> > From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- > > boun...@opensolaris.org] On Behalf Of Erik Trimble > > > > ZFS's problem is that it needs ALL the resouces for EACH pool ALL the > > time, and can't really share them well if it expects to keep performance > > from tanking... (no pun intended) > > That's true, but on the flipside, if you don't have adequate resources > dedicated all the time, it means performance is unsustainable. Anything > which is going to do post-write dedup will necessarily have degraded > performance on a periodic basis. This is in *addition* to all your scrubs > and backups and so on. > > > AGAIN, you're assuming that all system resources are used all the time and can't possibly go anywhere else. This is absolutely false. If someone is running a system at 99% capacity 24/7, perhaps that might be a factual statement. I'd argue if someone is running the system 99% all of the time, the system is grossly undersized for the workload. How can you EVER expect a highly available system to run 99% on both nodes (all nodes in a vmax/vsp scenario) and ever be able to fail over? Either a home-brew Opensolaris Cluster, Oracle 7000 cluster, or NetApp? I'm gathering that this list in general has a lack of understanding of how NetApp does things. If you don't know for a fact how it works, stop jumping to conclusions on how you think it works. I know for a fact that short of the guys currently/previously writing the code at NetApp, there's a handful of people in the entire world who know (factually) how they're allocating resources from soup to nuts. As far as this discussion is concerned, there's only two points that matter: They've got dedup on primary storage, it works in the field. The rest is just static that doesn't matter. Let's focus on how to make ZFS better instead of trying to guess how others are making it work, especially when they've got a completely different implementation. --Tim
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