We currently have both sides of this
particular scenario: systems with only one massive aggr with the root vol
contained within, and systems with a separate aggr\root vol and other aggrs
dedicated to data. It depends on the system: FAS250, or FAS270 (especially
the single-shelf variety), it is a WASTE of a system to have a separate aggr
for root. With some of the larger sized systems, it typically doesn’t
matter if you suddenly lose 3 disks out of 50+.
The traditional reason to keep the data
sets separate is recovery: losing both the root vol and data would be a
terrible shame. However, the chance of losing 3 disks across a single RG is almost
NIL. Even then, I’d rather lose my root than my data.
The other reason is performance: having a
heavy I/O load on data access could cause problems for filer performance if the
root vol were to be co-located within the same physical disks. Again, the
chance of having that type of issue with an extremely large aggregate isn’t
very high.
Between the two above arguments, there
aren’t a lot of reasons not to put it all together.
Glenn
From:
owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Fox, Adam
Sent: Wednesday, January 24, 2007
3:34 PM
To: Linux Admin; NetApp Toasters
List
Subject: RE: 1 disk shelf with 1
head....using just aggr0
I would just grow out aggr0 and save the
space. There are only a few corner cases
where having a dedicated root aggr makes
any sense and they are rare. So while it may
be nice to have, I wouldn't bother on a
system of that size. It would, indeed, be a horrible waster
of space.
With one shelf of disks, 99% of customers
should set up a single RAID-DP aggregate with a single
spare. There are exceptions, but
without knowing anything else about your environment or future
growth plans, that's what I'd do.
--
Adam Fox
adamfox@netapp.com
From: Linux
Admin [mailto:sysadmin.linux@gmail.com]
Sent: Wednesday, January 24, 2007
2:39 PM
To: NetApp Toasters List
Subject: 1 disk shelf with 1
head....using just aggr0
Would anyone recommend not using/growing aggr0 if I only have 1 disk
shelf
Currently I have 1 vol0 in agr0 (1 data disk + 2 paratiy)
I would think that creating a second aggr would be just enormous wast of 300GB
disks
What is the best practice? Should I just grow the aggr0?
Thanks