Well, I received a few responses, but most people seem to have the opposite
problem as me (they need more and more disk). Consistencies were: Don't
use partitioning at the HSG level, more so to ease management than for
specific technical reasons, Use Striped-Mirror sets (RAID1+0) NOT
Mirrored-Stripe sets (RAID0+1), create one (or more) Striped-Mirror sets and
present the whole thing to the OS and use LSM and/or ADVFS to slice and dice
them as needed.
So, I'm pretty much where I started. I ordered bunches of 18G disks instead
of 36G disks and will do what I can to parcel them out efficiently. I will
probably try a single Striped-Mirror set sliced up at the OS and see how the
DBA views the performance. Moving the data is simple enough if I have to
redistribute the disk.
Douglas L. Thomas
Unix Administrator
Great Lakes Gas Transmission
dthomas_at_glgt.com
-----Original Message-----
From: Thomas, Douglas L.
Sent: Monday, March 18, 2002 2:23 PM
To: Tru64 Unix Managers (E-mail)
Subject: More HSG80 Planning Woes (Partitioning)
Hello again,
This project gets more fun by the day....
I'm building a SAN with dual HSG80's in a 2200 chassis and six 4314's. This
will service four Tru64 Oracle servers and 8-10 NT/2000 servers.
My original idea was to create 36G or 72G RAID sets for the Oracle servers
and slice them up at the OS level for the OS and Oracle filesystems. After
listening to an Oracle "expert" (well at least he's written a book), I
changed from a RAID5 to a RAID0+1, but still on logical disk presented to
the server.
My close friend, Bob the DBA, has concerns because he will not have separate
spindles for his 4 oracle filesystems. I don't disagree with his concerns,
but also have some of my own. These oracle filesystems range from 2G to
12.5G, across the four systems nine are less than 5G and seven are larger
than 10G. And Compaq's smallest drive is 18G.
Compaq "suggests" against doing partitions at the HSG80 level, but the book
shows how to do it. Since I plan to use multi-bus fail over mode the
partition slices will be restricted to one HSG80 controller.
Does anyone have experience with either putting all of the oracle
filesystems (database, index files, redo logs, etc.) and the OS on one RAID
set or performing partitioning on the HSG80 and allocating those partitions
to different systems?
I've considered making four separate mirror sets (one for each oracle
filesystem) and allocating a partition of each to each of the servers.
Performance and cost are always important, but I just hate to waste so much
disk space to accommodate the performance.
Any input would be appreciated and I will summarize.
Thanks,
Douglas L. Thomas
Unix Administrator
Great Lakes Gas Transmission
dthomas_at_glgt.com
Received on Mon Mar 25 2002 - 20:39:40 NZST