Seth both. I don’t see how a single physical LUN provides enough
protection. As far as moving of the databases is the even possible with this
setup?
IAN
On Jun 28, 2017, at 11:57 AM, Seth Miller
<sethmiller.sm@xxxxxxxxx<mailto:sethmiller.sm@xxxxxxxxx>> wrote:
Ian,
Can you clarify your concern? Is the problem that you can't migrate your
databases without taking an outage, or that the LUN doesn't offer enough
protection for your database files?
Seth Miller
On Wed, Jun 28, 2017 at 1:39 PM, Andrew Kerber
<andrew.kerber@xxxxxxxxx<mailto:andrew.kerber@xxxxxxxxx>> wrote:
Most people run their VM's over shared storage, which allows for vmotion and
storage vmotion. When I am setting up small stuff, not enterprise, but want to
make sure of the data I use ASM and ASM native data protection, ie standard
redundancy. On the OS side, we can use snapshots.
On Wed, Jun 28, 2017 at 11:05 AM, MacGregor, Ian A.
<ian@xxxxxxxxxxxxxxxxx<mailto:ian@xxxxxxxxxxxxxxxxx>> wrote:
We run our VMs on local disk; i.e, no SAN or NAS. Let’s say physical machine
a has 24 disks. The standard configuration to create a 22 disk RAID 10
physical LUN. Then carve the virtual file systems out of that. I don’t like
this idea because, to doesn’t provide enough protection for the control and
online redo log files.
The reason for setting up one physical LUN is to allow for VM migration.
I presently have several small databases running on several VMs. I
insisted on at least two physical LUNs. The inability to migrate VMs means
the possibility of additional outages should their hypervisors need to be
shutdown, and the outage cannot be coordinated with other patching. So the
only databases I have on VMs are ones which do not have to be up 24 X 365
I’m not sure how VmWare has become so popular with this restriction. We are
replacing our present physical machines which host the VMs. The main
difference is the new servers are all SSD. This is highly attractive, but
the VmWare administrator has indicated their will be no exceptions for Oracle
If it is standard to care the VM file systems out of one physical LUNs what is
being done to protect the control file and redo logs.
Ian MacGregor
SLAC National Accelerator Laboratory
ian@xxxxxxxxxxxxxxxxx<mailto:ian@xxxxxxxxxxxxxxxxx>
--
Andrew W. Kerber
'If at first you dont succeed, dont take up skydiving.'
