Re: [zfs-discuss] Re: Re: Proposal: multiple copies of user data

[Gregory Shaw]

On Sep 12, 2006, at 2:55 PM, Celso wrote: On 12/09/06, Celso <[EMAIL PROTECTED]> wrote: One of the great things about zfs, is that it protects not just against mechanical failure, but against silent data corruption. Having this available to laptop owners seems to me to be important to making zfs even more attractive. I'm not arguing against that. I was just saying that *if* this was useful to you (and you were happy with the dubious resilience/performance benefits) you can already create mirrors/raidz on a single disk by using partitions as building blocks. There's no need to implement the proposal to gain that. It's not as granular though is it? In the situation you  describe: ...you split one disk in two. you then have effectively two partitions which you can then create a new mirrored zpool with. Then everything is mirrored. Correct? With ditto blocks, you can selectively add copies (seeing as how filesystem are so easy to create on zfs). If you are only concerned with copies of your important documents and email, why should /usr/bin be mirrored. That's my opinion anyway. I always enjoy choice, and I really believe this is a useful and flexible one. Celso This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss One item missed in the discussion is the idea that individual ZFS filesystems can be created in a pool that will have the duplicate block behavior.  The idea being that only a vast subset of your data may be critical.  This allows additional flexibility in a single disk configuration.  Rather than sacrificing 1/2 of the pool storage, I can say that my critical documents will reside in a pool that will keep two copies on disk. I think it's a great idea.  It may not be for everybody, but I think the ability to treat some of my files as critical is a excellent feature. ----- Gregory Shaw, IT Architect Phone: (303) 673-8273        Fax: (303) 673-2773 ITCTO Group, Sun Microsystems Inc. 500 Eldorado Blvd, UBRM02-401               [EMAIL PROTECTED] (work) Broomfield, CO 80021                          [EMAIL PROTECTED] (home) "When Microsoft writes an application for Linux, I've Won." - Linus Torvalds

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