Re: To LVM or not to LVM?

From: Mladen Gogala <>
Date: Wed, 8 May 2019 17:27:45 -0400
Message-ID: <>

I personally do prefer RDM over VMFS because RDM LUN can utilize SAN snapshot facility, which can be very handy. RDM or "raw disk mapping" assigns a real LUN from SAN to VM. VMFS does not allow that.  Using snapshots to perform database backup is a must when the database is large (10+ TB) and a full rman backup would take too long and be too heavy burden for the business to tolerate. By the way, I am no longer with Commvault. I


On 5/8/19 4:09 PM, Rich J wrote:
> On 2019/05/08 08:50, Stefan Koehler wrote:
>> Hello Rich,
>> VMFS or RDM is important because the number of LUNs per VMware host
>> is limited (
>> ) and also important because of the disk device queue.
>>> If that's the case, then I can see potential for LVM in creating
>>> small(er) LUNs and grouping the corresponding PVs into a VG to
>>> spread the load with a striped LV.

Mladen Gogala
Database Consultant
Tel: (347) 321-1217

Received on Wed May 08 2019 - 23:27:45 CEST

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