Dell PowerVault MD3000 Manuel d'utilisateur Page 51
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About Your Host 51
I/O Data Path Protection
You can have multiple host-to-array connections for a host. Make sure to
select all of the connections to the array when configuring host access to the
storage array.
NOTICE: Refer to the Installation Guide for more information on cabling
configurations.
NOTE: For maximum redundancy, you must select all host connections to the array
when manually defining host topology. For example, a host might have two host
connections. For this host, you would select two host connections.
If a component such as a RAID controller module or a cable fails, or an error
occurs on the data path to the preferred RAID controller module, virtual disk
ownership is moved to the alternate nonpreferred RAID controller module for
processing. This failure or error is called failover.
Multi-path drivers such as MPIO and MPP are installed on host systems that
access the storage array and provide I/O path failover. The multi-path driver
(MPIO in Windows and MPP in Linux) is used for failover. Automatic Virtual
Disk Transfer (AVT) is used specifically for single-port cluster failover. The
AVT feature mode is automatically selected by host type.
NOTE: You should have the multi-path driver installed on the hosts at all times,
even in a configuration where there is only one path to the storage system, such as
a single port cluster configuration.
During a failover, the virtual disk transfer is logged as a critical event, and an
alert notification is sent automatically if you have configured alert
destinations for the storage array.
Failover with Red Hat Enterprise Linux
For users running Red Hat Enterprise Linux Version 3.0 (x86), the mpp_vhba
failover driver component does not load unless a storage array is connected
and a LUN is mapped to the host server. Follow these steps to ensure proper
MPP driver loading and LUN mapping:
1
Ensure that the storage array is connected to the host server and that out-
of-band (Ethernet) connections to each RAID controller module exist.
2
Create a virtual disk and map it to LUN 0.
3
Reboot the host.
- Storage Manager User’s Guide 1
- Notes and Notices 2
- Contents 3
- 4 Contents 4
- 6 Contents 6
- 8 Contents 8
- 10 Contents 10
- About This Guide 11
- Summary Tab 12
- Configure Tab 12
- Modify Tab 12
- Tools Tab 13
- Support Tab 13
- About Your Storage Array 15
- Adding Storage Arrays 17
- Naming Storage Arrays 18
- Removing Storage Arrays 18
- Setting Up Your Storage Array 19
- Storage Array Support Data 21
- Setting a Password 21
- Resetting a Password 22
- Microsoft 23
- Operating Systems 23
- LINUX Operating System 23
- Reset Password 24
- Configuring E-mail Alerts 25
- Storage Array 26
- Configuring SNMP Alerts 27
- Storage Array 29 29
- 30 Storage Array 30
- Using iSCSI 31
- Creating CHAP Secrets 32
- Initiator CHAP Secret 33
- Target CHAP Secret 33
- Statistics 37
- 40 Using iSCSI 40
- Event Monitor 41
- Disabling the Event Monitor 42
- About Your Host 43
- Automatic Configuration 44
- About Your Host 45 45
- Removing Host Access 46
- Host Groups 47
- Host Topology 49
- Host Context Agent 50
- I/O Data Path Protection 51
- 52 About Your Host 52
- Disk Groups and Virtual Disks 53
- Manual Configuration 55
- Hot Spare Drive Protection 58
- Host-to-Virtual Disk Mapping 60
- Storage Partitioning 61
- Disk Group Expansion 62
- Virtual Disk Expansion 62
- Storage Array Media Scan 63
- Microsoft Services 64
- Volume Shadow-Copy Service 65
- Simple Path 68
- Advanced Path 73
- Snapshot Virtual Disks 77 77
- Snapshot Virtual Disks 78
- Snapshot Repository Capacity 79
- Premium Feature—Virtual Disk 83
- Virtual Disk Copy 85 85
- Virtual Disk Copy 86
- Creating a Virtual Disk Copy 87
- Copying the Virtual Disk 88
- Setting Copy Priority 89
- Stopping a Virtual Disk Copy 90
- Recopying a Virtual Disk 90
- Recopying the Virtual Disk 92
- Removing Copy Pairs 93
- 94 Virtual Disk Copy 94
- Firmware Downloads 95
- Firmware Downloads 97 97
- Downloading EMM Firmware 99
- 100 Firmware Downloads 100
- Troubleshooting Problems 101
- SMrepassist Utility 102
- Support Information Package 103
- Unidentified Devices 104
- Troubleshooting 106
- Considerations 107
- Standalone Host Servers 109
- 110 Hardware Considerations 110
- Index 111 111
- Index 113 113
- 114 Index 114
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