HP VMA-series Memory Arrays Aviso descarregar pdf (Página 10)

SAN Gateway only supports the de facto standard Peripheral Device Addressing (PDA) mode.

Legacy mode requires Volume Set Addressing (VSA) for targets which support greater than 8 LUNs

(LUN IDs 0-7) attached. The „Agile View‟ of HP-UX 11i v3 Mass Storage Stack supports both PDA

and VSA addressing modes for storage devices and also provides I/O and connectivity support well

beyond 11i v2 limits. The backward compatible „Legacy View‟ support delivered with HP-UX 11i v3

is scheduled to be deprecated with the next major release of HP-UX.

Similarly you must only use the „Agile View‟ capabilities of management utilities such as System

Management Homepage (SMH) when managing LUNs created on the VMA array so that all LUNs

beyond LUN ID 7 are viewable and manageable.

Do Not Create a LUN 0 on the VMA Array

One of the values of HP-UX, especially the 11i v3 release, is commitment and focus on data integrity.

With 11i v3 and ability to bind DSFs to LUN WWIDs, we are also able to ensure that when a storage

device/LUN replacement is made that it is intentional. If there is a device with a new LUN WWID

connected to where a device was previously connected and only the LUN WWID has changed, HP-

UX 11i v3 asks for authorization to allow that replacement of device before allowing access,

especially writing to it, which could cause accidental data loss if it was not the correct device nor

intended to be a replacement device. For this reason it is recommended to not explicitly configure a

LUN ID 0 on the VMA SAN Gateway as any change or inability to access the created LUN 0 could

cause inaccessibility to all LUNs and stored data.

Queue-Depth Settings Using TPCC with HP-UX 11i v3

It is highly recommended to use the Target Port Congestion Control (TPCC) feature available with the

HP-UX 11i v3 Mass Storage Stack to manage and control I/O queue depth with the VMA SAN

Gateway. For additional information and usage of TPCC, see the “HP-UX 11i v3 Congestion Control

Management for Storage White Paper” available at:

http://h20000.www2.hp.com/bc/docs/support/SupportManual/c02054623/c02054623.pdf

Use the following table to determine appropriate TPCC settings with HP-UX 11i v3 for your

environment:

Table 3. HP-UX 11i v3 TPCC queue depth values.

THEN TPCC Setting is

I/Os are 4KB aligned and < 256KB

1024 / number of servers*

I/Os are 4KB aligned and > 256KB

512 / number of servers*

I/Os are NON-4KB aligned and < 256KB

512 / number of servers*

I/Os are NON-4KB aligned and > 256KB

256 / number of servers*

* where servers can be a whole physical server or a partition.

Linux

The Linux distros RHEL 5.7 and SLES 11 SP1 have been validated on the DL980 G7 server with the

HP VMA SAN Gateway and connected VMA-series Memory Arrays. Additional limitations and

considerations for Linux environments are shared in the following subsections.

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HP VMA-series Memory Arrays Aviso Página 10