On 03/31/10 05:11 PM, Brett wrote:
Hi,Hi Folks, Im in a shop thats very resistant to change. The management here are looking for major justification of a move away from ufs to zfs for root file systems. Does anyone know if there are any whitepapers/blogs/discussions extolling the benefits of zfsroot over ufsroot?Regards in advance Rep Benefits of ZFS boot are described in a number of places, such as the ZFS boot discussion at http://hub.opensolaris.org/bin/view/Community+Group+zfs/boot and on BigAdmin, along with a lot of "how to" documents. Some other URLs you may find helpful: http://blogs.sun.com/storage/entry/zfs_boot_in_solaris_10 http://blogs.sun.com/tabriz/entry/zfs_boot http://www.sun.com/bigadmin/content/submitted/zfs_root_clone.jsp FWIW I touched on it briefly in a blog entry primarily on function added after initial ZFS boot support) http://blogs.sun.com/jsavit/entry/zfs_live_upgrade_and_flash and at http://blogs.sun.com/jsavit/entry/a_new_look_at_an Here are a few of the specific reasons: - You have a pool of storage and don't have to worry about creating slices for /, /var and so forth and finding out you didn't create them with enough space (or with too much). Putting this another way, you don't have to preallocate file systems, and they only consume as much space as they need. - If you have a volume manager - you no longer need it, which reduces complexity and possibly cost. - You get data integrity and mirroring without effort - something you really want on a boot device. It's just a lot easier. - Creating an alternative boot environment for Live Upgrade is much faster and easier, cloning existing boot environments and only storing changed bits instead of duplicating all of them. You can have as many boot environments as you feel like instead of being limited by the number of slices. ZFS lets you leverage snapshots and clones to speed up and simplify system management. Initial lucreate is faster, and subsequent ones are MUCH faster. and perhaps my favorite: - on-disk data consistency. No more fsck, ever! I hope that's helpful. regards, Jeff --
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