D-Link DSN-656 User Manual - Page 109

Change Controller Mode, Recommend iSNS Server, Lockdown, Single, System Maintenance -> Upgrade

Get D-Link DSN-656 PDF manuals and user guides View all D-Link DSN-656 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 109 highlights

D-Link Document - User Manual ownership of RAID group will switch to the working controller. For example, if controller 1, which owns the RAID group 1 fails accidently, the ownership of RAID group 1 will be switched to controller 2 automatically. The system and data can then keep working well. After controller 1 is fixed or replaced, the current owner of all RAID groups will be assigned back to their preferred owner. 3. Lockdown: Dual controller mode. The firmware of two controllers is different or the size of memory of two controllers is different. In this stage, only the master controller can work and I/O will write through the protected data. 4. Single: Single controller mode. In this stage, the controller must stay in slot A and MUX boards for SATA drives are not necessary. The differences between single and degraded are described below. There is no error message for one controller only. I/O will not overwrite through and there is no ownership of RAID group. Change Controller Mode The operation mode can be changed from Single to Dual or vice versa. Here are the procedures: 1. In System Maintenance -> Upgrade tab, choose Single or Dual in the drop-down list. 2. Click the Apply button, it will pop up a warning message, click the OK button to confirm. Recommend iSNS Server An iSNS server is recommended for helping to manage devices. It's important for keeping I/O running smoothly when the ownership of the RAID group is switching or one of the dual controllers fails. For example, without iSNS server, when the controller 1 fails, the running I/O from host to controller 1 may fail because the host switching to a new portal is slower at that moment and as a result may cause I/O time out. With a iSNS server, this case would not happen. TIP: iSNS server is recommended for dual controller system of iSCSI interfaces. Copyright@2014 D-Link System, Inc. All Rights Reserved. 109

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
D-Link Document – User Manual
ownership of RAID group will switch to the working controller. For example, if controller 1,
which owns the RAID group 1 fails accidently, the ownership of RAID group 1 will be
switched to controller 2 automatically. The system and data can then keep working well.
After controller 1 is fixed or replaced, the current owner of all RAID groups will be assigned
back to their preferred owner.
3.
Lockdown:
Dual controller mode. The firmware of two controllers is different or the size of
memory of two controllers is different. In this stage, only the master controller can work and
I/O will write through the protected data.
4.
Single:
Single controller mode. In this stage, the controller must stay in slot A and MUX
boards for SATA drives are not necessary. The differences between single and degraded are
described below. There is no error message for one controller only. I/O will not overwrite
through and there is no ownership of RAID group.
Change Controller Mode
The operation mode can be changed from Single to Dual or vice versa. Here are the procedures:
1.
In
System Maintenance -> Upgrade
tab, choose
Single
or
Dual
in the drop-down list.
2.
Click the
Apply
button, it will pop up a warning message, click the
OK
button to confirm.
Recommend iSNS Server
An iSNS server is recommended for helping to manage devices. It’s important for keeping I/O
running smoothly when the ownership of the RAID group is switching or one of the dual
controllers fails. For example, without iSNS server, when the controller 1 fails, the running I/O
from host to controller 1 may fail because the host switching to a new portal is slower at that
moment and as a result may cause I/O time out. With a iSNS server, this case would not happen.
TIP:
iSNS server is recommended for dual controller system of iSCSI interfaces.
109
Copyright@2014 D-Link System, Inc. All Rights Reserved.