Hp StorageWorks Scalable File Share User Manual download pdf (Page 19)

minimum memory for OSS servers according to the following guidelines, based on the number

of OSTs connected to the OSS server pair, at a rate of 2 GB per OST:

• 8 GB:

— 2x [MSA2000fc + 1xJBOD] = 4xOSTs per OSS pair = 2xOST per OSS

• 16GB:

— 4x [MSA2000fc + 1xJBOD] = 8xOSTs per OSS pair = 4xOST per OSS

— 2x [MSA2000fc + 3xJBOD] = 8xOSTs per OSS pair = 4xOST per OSS

• 32 GB:

— 4x [MSA2000fc + 3xJBOD] = 16xOSTs per OSS pair = 8xOST per OSS

More memory for the servers increases performance and is recommended when budgets allow.

IMPORTANT: Memory requirements for HP SFS G3.2-0 have increased from previous versions.

Before deciding whether to upgrade to HP SFS G3.2-0, please determine whether additional

memory is needed for your systems. Insufficient memory can cause poor performance, or can

cause the system to become unresponsive and/or crash.

A new default feature called OSS Read Cache in Lustre V1.8 increases performance for read

intensive workloads at the expense of additional memory usage on the OSS servers. If you don't

have sufficient memory for proper operation of the OSS Read Cache feature, or don't want to

use the functionality, see the Lustre Operations Manual section 22.2.7.1 for instructions on disabling

the capability.

1.3.1.2 Fibre Channel Switch Zoning

If your Fibre Channel is configured with a single Fibre Channel switch connected to more than

one server node failover pair and its associated MSA storage devices, you must set up zoning

on the Fibre Channel switch. Most configurations are expected to require this zoning. The zoning

should be set up such that each server node failover pair only can see the MSA2000 storage

devices that are defined for it, similar to the logical view shown in Figure 1-1 (page 17). The

Fibre Channel ports for each server node pair, and its associated MSA storage devices should

be put into the same switch zone.

For the commands used to set up Fibre Channel switch zoning, see the documentation for your

specific Fibre Channel B-series switch available from:

http://www.hp.com/go/san

1.4 Server Security Policy

The HP Scalable File Share G3 servers run a generic Linux operating system. Security

considerations associated with the servers are the responsibility of the customer. HP strongly

recommends that access to the SFS G3 servers be restricted to administrative users only. Doing

so will limit or eliminate user access to the servers, thereby reducing potential security threats

and the need to apply security updates. For information on how to modify validation of user

credentials, see “Configuring User Credentials” (page 35).

HP provides security updates for all non-operating-system components delivered by HP as part

of the HP SFS G3 product distribution. This includes all rpm's delivered in

/opt/hp/sfs. Additionally, HP SFS G3 servers run a customized kernel which is modified to

provide Lustre support. Generic kernels cannot be used on the HP SFS G3 servers. For this reason,

HP also provides kernel security updates for critical vulnerabilities as defined by CentOS kernel

releases which are based on RedHat errata kernels. These kernel security patches are delivered

via ITRC along with installation instructions.

It is the customer's responsibility to monitor, download, and install user space security updates

for the Linux operating system installed on the SFS G3 servers, as deemed necessary, using

1.4 Server Security Policy 19

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