User guide

DataDirect Networks SFA™ OS 2.0.0 Release Notes Revision A1 | 20

4. opensm -g <port GUID> (where port GUID is the port GUID from ibstat

output

run_srp_daemon -R 20 -T 10 -nce -i <ca_name> -p <port> (where ca_name is

the channel adapter name and port is the port number)

6.0 Recommended Practices

The recommended best practices for SFA OS version 2.0.0 include:

• SS6000 DEM and I/O module replacement.

For SS6000 DEM and I/O module replacement, see the SFA OS User Guide for the

procedures.

• Reduce host I/O load during background initializations.

When a storage pool is in the process of being initialized, a significant internal I/O

load is generated. To avoid poor performance, DDN recommends that heavy host I/O

loads be avoided until pool initialization has completed.

• On hosts that are directly connected, if the configuration is cleared, the

Fibre Channel initiators may not log back into the subsystem.

This results in no initiators being available to assign to new presentations. To correct

this, do a rescan from the host before setting up your presentations.

This does not apply to the SFA12K-40 and SFA12K-20.

• Disk firmware upgrades.

Before performing a disk firmware upgrade, scp the .DDN file to both controllers.

This avoids a situation where a controller attempts to perform the upgrade but can’t

find the .DDN file.

• Firmware upgrades should be done during low usage periods whenever

possible.

As upgrading your system will interrupt I/O operations as paths fail over, be aware of

the possibility of increased I/O latencies during the upgrade operation. Prior to

upgrading your firmware, DDN recommends reviewing the system logs to ensure the

system is running cleanly. DDN also recommends allowing any rebuilds and forced

verify jobs to complete and pausing any running verify jobs.

When a controller is shut down, all cached data must be flushed before the controller

will shut down. This operation can take a considerable amount of time depending

upon the amount of cache and if the cached data is sequential vs. random, large block

vs. small block, number of VDs, and so on. Should the shutdown fail, an event will be

generated. If you do not see the event, the controller is still shutting down. Please

allow it to complete to avoid possible data loss issues.

• Update the secondary controller first.

When performing an SFA OS upgrade, upgrade the secondary controller first. Doing

this requires primary to move once instead of twice.

7.0 Compatibility Guide

The SFA OS Compatibility Guide lists the client operating systems, HBA and HCAs,

enclosures, and disk drives that are supported by SFA OS. The guide is available at

http://www.ddn.com/en/support/product-downloads-and-documentation

NOTE: The Compatibility Guide applies to SFA12K-40, SFA12K-20, SFA10K-X,

SFA10K-M, and SFA7700.