Re: To LVM or not to LVM?

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

Regards

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 (
>> https://www.virten.net/vmware/vmware-vsphere-esx-and-vcenter-configuration-maximums/
>> ) 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


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