Just bear in mind that any aggregate will only perform as
well as the slowest RAID group. Spanning an aggregate across multiple adaptors
will improve fault tolerance. WAFL will automatically select disks across
adapters to maximise that.
From: owner-toasters@mathworks.com
[mailto:owner-toasters@mathworks.com] On Behalf Of Kelley
Green Sent: 21 September 2006 05:07 To: Brosseau,
Paul Cc: Jeff Mery; owner-toasters@mathworks.com;
toasters@mathworks.com Subject: RE: Mixed disk sizes within a single
aggregate
What about aggregates across FC
adapters? Recommended, not recommended, or not an issue?
Kelley
Kelley R. Green IT Specialist Global Technology Services -
Storage Access Line 801-415-0449 Cell 801-916-1273 e-mail:
krgreen@us.ibm.com
"Brosseau, Paul"
<Paul.Brosseau@netapp.com> Sent by: owner-toasters@mathworks.com
Mixing disk sizes in an aggregate is not a problem as long as
you create RAID groups for each kind of disk. WAFL creates stripes at the
RAID group level. For best results create complete RAID groups each time
you add disks to an aggregate.
Paulb
From: Jeff Mery [mailto:jeff.mery@ni.com]
Sent: Wednesday, September 20, 2006 3:30 PM To:
toasters@mathworks.com Subject: Mixed disk sizes within a single
aggregate
Greetings fellow toasters! <Background> We're looking at moving our 2 FAS940 systems from
tradtional volumes to flexvols + aggregates. </Background>
It would seem to me that the same
rules and guidelines for creating traditional volumes now apply directly to the
aggregate level (for the most part). By rules and guidelines I mean things
like trying not to mix disk sizes, try to avoid volumes (now aggregates?) that
span FC adapters, etc.
Are any of these things still a concern on modern versions of ONTAP
(7+)? Does anyone have any best practices they'd be willing to share in
regards to aggregate creation? NOW says "make them as big as possible
using as many spindles as possible", but that doesn't really help much. We
use our filers for unstructured data only; cifs + nfs but no databases, no
snapmirror, no snapvault, etc..
TIA, Jeff Mery - MCSE, MCP National
Instruments
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