<div>
Have you mapped the LUN to the host? see &quot;Changing a volume’s explicit mappings&quot; in <a href="https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-c05075467#N1018F" rel="ugc">https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-c05075467#N1018F</a>&nbsp;for example.
</div>


<div>
Yes I have mapped, I have followed this to create a volume and map it as LUN 1 but still I cannot see it on Disk Management. Rebooted both MSA and server. Let me know if you want any other info.
</div>


<div>
If it is SAS host connect you have to enable milti-LUN under the &nbsp;OS/driver as SAS HBAs only scan for LUN0 by default.
</div>


<div>
How do i enable that? I have enabled MPIO in Windows Server 2012 R2.
</div>


<div>
Depends which HBA you have but it is set in the card's BIOS utility during POST.
</div>


<div>
That's FC, not SAS so multi-lun is enabled anyway.
</div>


<div>
What could be the issue? of drives no appearing on the Disk management.
</div>


<div>
Driver up to date? <a href="https://support.hpe.com/hpsc/swd/public/detail?swItemId=MTX_36cc9e7ed41a4060a5f3c6b1de#tab-history" rel="ugc">https://support.hpe.com/hpsc/swd/public/detail?swItemId=MTX_36cc9e7ed41a4060a5f3c6b1de#tab-history</a>&nbsp;is latest I think.
</div>


<div>
I have updated the driver, now I want to try another server. and will update.
</div>


<div>
Some of these HBAs no longer do FC/AL (which is what is used for direct attaching) and only work in switched fabric. You can verify that easily enough in BIOS as you can set the order it tries to initiate (loop first or fabric first). However that's very unlikely as you can see the WWN of the server on the MSA.<br />
<br />
What do you see in MPIO? , presumably it is dual attached so MPIO is needed to stop you seeing the virtual disk twice.
</div>


<div>
I set up another server and now i can see the drives, but I see 2, I thought the MPIO will take care of the second mapping. I map them with Controller A and Controller B, and i see 2 drives in disk management. thanks for all the help.
</div>


<div>
MPIO should sort out the dual paths but it's not automatic, you have to configure it in control panel.<br />
mpclaim -v will list out the MPIO config.<br />
<br />
If you made a 2nd LUN for the 2nd host you may be seeing both LUNs on one host.
</div>


<div>
Thank you, should i only use one LUN? so its dual path but one drive.
</div>


skywalker7

<div>
Thank you for all the help.
</div>


<div>
<div class="content wysiwyg-content">
MSA 2040 SAN + HBA card+Windows 2012 R2 Server. Drives do not appear in Disk Management. The SAN Storage is connected directly to server port A1 and B1 to HBA card, SFP+ all active, I can see initiators but when i create drives they do not appear on the server. Might be missing something here.
</div>
</div>


MSA 2040 SAN + HBA card+Windows 2012 R2 Server. Drives do not appear in Disk Management. The SAN Storage is connected directly to server port A1 and B1 to HBA card, SFP+ all active, I can see initiators but when i create drives they do not appear on the server. Might be missing something here.

MSA 2040 connecting to Server directly

Computer data storage, often called storage or memory, is a technology consisting of computer components and recording media used to retain digital data. In addition to local storage devices like CD and DVD readers, hard drives and flash drives, solid state drives can hold enormous amounts of data in a very small device. Cloud services and other new forms of remote storage also add to the capacity of devices and their ability to access more data without building additional data storage into a device.

Storage

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.

Windows Server 2012

Storage devices include any device used for storing and retrieving digital information. Hard disk drives (HDDs) use one or more rigid ("hard") rapidly rotating disks (platters) coated with magnetic material. Data is accessed in a random-access manner, meaning that individual blocks of data can be stored or retrieved in any order and not only sequentially. The primary competing technology for secondary storage is flash memory in the form of solid-state drives (SSDs), but HDDs remain the dominant medium for secondary storage due to advantages in price per bit and per-device recording capacity. CD-RW (Compact Disc-ReWritable) is a digital optical disc storage format that allows information to be stored outside the mechanical HDD.