Re: To LVM or not to LVM?
- From: Rich J <rjoralist3@xxxxxxxxxxxxxxxxxxxxx>
- To: Oracle L <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 08 May 2019 07:53:18 -0500
On 2019/05/07 15:28, Rich J wrote:
Migrating from AIX to OL7 (x86-64) under VMware with an all-flash SAN, and
I'm planning out the logical volumes for database filesystems (non-ASM). I'm
now questioning whether or not to use LVM, even for filesystems. If I need
to add datafiles without LVM, the Storage Manager adds a new virtual disk to
the server, and I create a new mountpoint and set security on it. Easy.
In AIX with XIV storage, there was a minimum ~17GB allocation per LUN, so
there was space savings in using LVM to group together small control files,
redo logs, etc. Not being a vSphere person, I don't know if this is the case
there as well.
Any opponents/proponents for/against LVM for Oracle database virtual servers?
Thanks for the responses! I guess I'm wondering why one would use LVM
for Oracle datafiles. We're currently using AIX's LVM and it's fine. I
use LVM on OL6 at home because I have two mountpoints on my RAID set,
and LVM makes it a breeze to only expand which ever one I need to and by
how much I want.
But for Oracle datafiles, why LVM? It seems like unnecessary overhead,
or I just can't think of a scenario where it would be beneficial.
Without LVM, I get a 500GB virtual disk and I create a single partition
on it, add XFS, and create a mountpoint for it. When I need more than
15 32GB datafiles, I get another 500GB virtual disk. Rinse. Repeat.
LVM can certainly do that, too, but with more overhead, and I can't see
any advantage to using it for this specific situation.
What am I missing? (besides caffeine) I'm a big fan of the flexibility
of LVM, but I want to understand why I should use it here.
Thanks again!
Rich
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