If you use Qtrees you can snapmirror on a Qtree basis (QSM) rather than a whole volume - does not bring across the snapshot history like a volume snapmirror (VSM)

You can also set Qtree Quotas based upon the Qtree directory, and also you can have different security styles set on a Qtree by Qtree basis.

Some backup vendors (Legatto / Symantec nee Veritas) also recognise Qtrees and allows administrators to make the backups more granular, breaking down a potentially multi Tb volume backup into a number of more manageable Gb Qtrees.

Qtrees make manipulating and managing data a little easier - sometimes if you don't think you will need to use them, you find that you wish you had at a later date :o) Been there !

Jason

-----Original Message----- From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Lori Barfield Sent: 10 November 2005 18:49 To: Jerry Cc: John Stoffel; toasters@mathworks.com Subject: Re: howto document for initial volume architecting?

On 11/10/05, Jerry juanino@yahoo.com wrote:

Whats the primary reason to use qtrees under flexvols?

from my reading, it looks like the only way to define access rights in a non-unix way is to have qtrees. i'd think this could be critical to admins in heterogeneous environments.

i found qtrees to be useful yesterday for their nfs ops stats. if you are stuck with one big volume of data, and all your other stats are aggregate, that's a blessing.

...lori

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