Dell 341-7212 User Guide - Page 35

Using the Replace Member Feature and Revertible Hot Spares

Get Dell 341-7212 - PERC 6/i Integrated SAS RAID Controller Card Storage PDF manuals and user guides View all Dell 341-7212 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 35 highlights

3 In the right panel of the Operations tab, select the disk group (array) to which the hotspare will be dedicated. 4 Click Go to create the dedicated hotspare. Using the Replace Member Feature and Revertible Hot Spares The Replace Member functionality allows a previously commissioned hot spare to be reverted back to a usable hot spare. When a drive failure occurs within a virtual disk, an assigned hot spare (dedicated or global) is commissioned and begins rebuilding until the virtual disk is optimal. Once the failed drive is replaced (in the same slot) and the rebuild to the hot spare is complete, the controller automatically starts to copy data from the commissioned hot spare to the newly-inserted drive. Once this is complete, the new drive is part of the virtual disk and the hot spare is reverted back to being a ready hot spare; this allows hot spares to remain in specific enclosure slots. While the controller is reverting the hot spare, the virtual disk remains optimal. NOTE: The controller automatically reverts a hot spare only if the failed drive is replaced with a new drive in the same slot. If the new drive is not placed in the same slot, a manual replace member operation can be used to revert a previously commissioned hot spare. The Replace Member function works with another fault tolerance feature, load balancing, to avoid downtime and keep data available to users. Load balancing is a method of spreading work between two or more computers, network links, CPUs, physical disk drives, or other resources. Load balancing is used to maximize resource use, throughput, or response time. In the controllers, the balancing service is performed by the firmware. Using multiple paths with load balancing, instead of a single path, can increase availability through redundancy. If there are redundant paths to different ports of a device, then access to a device is not lost if a path fails. Automatic Replace Member with Predicted Failure A Replace Member operation can occur when there is a SMART predictive failure reporting on a drive in a virtual disk. The automatic Replace Member is initiated when the first SMART error occurs on a physical disk that is part of a virtual disk. The target drive needs to be a hot spare that qualifies as a rebuild drive. The physical disk with the SMART error is marked as "failed" only after the successful completion of the Replace Member. This avoids putting the array in degraded status. Configuration 35

  • 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
Configuration
35
3
In the right panel of the Operations tab, select the disk group (array) to
which the hotspare will be dedicated.
4
Click
Go
to create the dedicated hotspare.
Using the Replace Member Feature and
Revertible Hot Spares
The Replace Member functionality allows a previously commissioned hot spare
to be reverted back to a usable hot spare. When a drive failure occurs within a
virtual disk, an assigned hot spare (dedicated or global) is commissioned and
begins rebuilding until the virtual disk is optimal. Once the failed drive is
replaced (in the same slot) and the rebuild to the hot spare is complete, the
controller automatically starts to copy data from the commissioned hot spare to
the newly-inserted drive. Once this is complete, the new drive is part of the
virtual disk and the hot spare is reverted back to being a ready hot spare; this
allows hot spares to remain in specific enclosure slots. While the controller is
reverting the hot spare, the virtual disk remains optimal.
NOTE:
The controller automatically reverts a hot spare only if the failed drive is
replaced with a new drive in the same slot. If the new drive is not placed in the
same slot, a manual replace member operation can be used to revert a previously
commissioned hot spare.
The Replace Member function works with another fault tolerance feature, load
balancing, to avoid downtime and keep data available to users. Load balancing is
a method of spreading work between two or more computers, network links,
CPUs, physical disk drives, or other resources. Load balancing is used to
maximize resource use, throughput, or response time. In the controllers, the
balancing service is performed by the firmware. Using multiple paths with load
balancing, instead of a single path, can increase availability through redundancy.
If there are redundant paths to different ports of a device, then access to a
device is not lost if a path fails.
Automatic Replace Member with Predicted Failure
A Replace Member operation can occur when there is a SMART predictive
failure reporting on a drive in a virtual disk. The automatic Replace Member
is initiated when the first SMART error occurs on a physical disk that is part
of a virtual disk. The target drive needs to be a hot spare that qualifies as a
rebuild drive. The physical disk with the SMART error is marked as "failed"
only after the successful completion of the Replace Member. This avoids
putting the array in degraded status.