HP StorageWorks 2000 Modular Smart Array Reference Guide (481599-003, August 2008)

58 HP StorageWorks 2000 Family Modular Smart Array reference guide • August 2008
Configuring SNMP Traps
You can configure the following options for SNMP notification of events:
■ Read and write community strings
■ IP addresses of hosts that are configured to receive SNMP traps
To configure SNMP traps:
1. Select Manage > Event Notification > SNMP Configuration.
2. Type values in the following fields:
■ SNMP Read Community – The SNMP read password for your network. The
value is case sensitive and can include 15 characters. The default is
public.
■ SNMP Write Community – The SNMP write password for your network. The
value is case sensitive and can include 15 characters. The default is
private.
■ SNMP Trap Host IP Address 1–3 – The IP addresses of host systems that are set
up to receive SNMP traps.
3. Enable or disable SNMP traps.
The default is No (disable).
4. Click Change SNMP Traps Configuration.
Changing the Cache Redundancy Mode
In the storage system’s default operating mode, either Active-Active (FC and iSCSI)
or Active-Active ULP (SAS), data for volumes configured to use write-back cache
is automatically mirrored between the two controllers. Cache redundancy provides
fault tolerance but has a slight impact on write performance; it has no effect on read
performance. You can disable cache redundancy, which permits independent cache
operation for each controller; this is called independent cache performance mode
(ICPM). When independent cache performance mode is in use, this is shown in each
page’s System Panel and in the Status Message panel on the Status Summary page.
The advantage of ICPM is that the two controllers can achieve very high write
bandwidth and still use write-back caching. User data is still safely stored in
nonvolatile RAM, with backup power provided by super-capacitors should a power
failure occur. ICPM is useful for high-performance applications that require
maximum write throughput and do not require fault tolerance.