Here's what makes me say that:
There are over 700 boxes deployed using Flash Archive's on an S10 system with a UFS root. We've been working on basing our platform on a ZFS root and took Scott Dickson's suggestions (http://blogs.sun.com/scottdickson/entry/flashless_system_cloning_with_z fs) for doing a System Clone. The process worked out well, the system came up and looked stable until 24 hours later kernel panic's became incessant and svc.configd won't load its repository any longer. Hope that explains where I'm coming from.. Regards, Chris From: lori....@sun.com [mailto:lori....@sun.com] Sent: Tuesday, February 24, 2009 3:13 PM To: Christopher Mera Cc: Brent Jones; zfs-discuss@opensolaris.org Subject: Re: [zfs-discuss] zfs streams & data corruption On 02/24/09 12:57, Christopher Mera wrote: How is it that flash archives can avoid these headaches? Are we sure that they do avoid this headache? A flash archive (on ufs root) is created by doing a cpio of the root file system. Could a cpio end up archiving a file that was mid-way through an SQLite2 transaction? Lori Ultimately I'm doing this to clone ZFS root systems because at the moment Flash Archives are UFS only. -----Original Message----- From: Brent Jones [mailto:br...@servuhome.net] Sent: Tuesday, February 24, 2009 2:49 PM To: Christopher Mera Cc: Mattias Pantzare; Nicolas Williams; zfs-discuss@opensolaris.org Subject: Re: [zfs-discuss] zfs streams & data corruption On Tue, Feb 24, 2009 at 11:32 AM, Christopher Mera <cm...@reliantsec.net> <mailto:cm...@reliantsec.net> wrote: Thanks for your responses.. Brent: And I'd have to do that for every system that I'd want to clone? There must be a simpler way.. perhaps I'm missing something. Regards, Chris Well, unless the database software itself can "notice" a snapshot taking place, and flush all data to disk, pause transactions until the snapshot is finished, then properly resume, I don't know what to tell you. It's an issue for all databases, Oracle, MSSQL, MySQL... how to do an atomic backup, without stopping transactions, and maintaining consistency. Replication is on possible solution, dumping to a file periodically is one, or just tolerating that your database will not be consistent after a snapshot and have to replay logs / consistency check it after bringing it up from a snapshot. Once you figure that out in a filesystem agnostic way, you'll be a wealthy person indeed.
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