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137MAXDATA SR1202 M1 – StorView
®
RAID User Guide
Statistic Description
Command Size Expressed in the percentage of commands whose size is
specified for reads and writes. The values are displayed with a
horizontal bar for each value. The lack of a bar displayed for a
specific value indicates it is 0% (or less than 1%).
For example, consider a read or write command from a host
system with Logical Block Address (LBA) 0x0000070, and
access size 0x80, expressed in decimal 128. Using 512 byte
blocks on the disk drives, it can be seen that this is a read of 64
Kbytes, which is the command size.
Alignment This is the percentage of commands whose address is aligned
on the specified chunk boundary. The alignment of a command
from a host system is determined by the command’s address.
In an optimal system, a write of one chunk of data would reside
exactly within a chunk on one disk. However, if this is not the
case, this write will be split up into two separate writes to two
different data drives. This of course will have a negative effect
on performance. To overcome these problems, the user can,
with more sophisticated operating systems, set the access size
and alignment to an optimal value. These statistics can help the
user to tune the operating system.
How to Use Command Size and
Alignment
To calculate the alignment, we check the LBA for the largest
number of blocks that will evenly divide into it, in powers of
2. So, we can see that in this case, the alignment is 0x10 = 16
blocks. This equates to 8K.
The alignment, in conjunction with the access size, gives an
indication of how many drives are involved in an access. In the
above example, consider a RAID 5/50 array with a chunk size
of 64K. In this case, the above access will actually involve 2
data drives, since it needs to access 8K in the first drive (0x80
– 0x70 = 0x10 blocks = 8K), and the remaining 56K in the next
drive (0x70 blocks = 56K). This is clearly inefficient, and could
be improved by setting the alignment to 64K on the operating
system. If that is not possible, using a larger chunk size can
help, as this reduces the number of accesses that span chunks.
Aligning an access on the same value as the access size will
improve performance, as it will ensure that there are no multi-
chunk accesses for commands that are smaller thana chunk
size.
- StorView 1
- RAID User Guide 1
- MAXDATA SR1202 M1 1
- 2 Contents 2
- Contents 3
- 8 SAN LUN Mapping 63 4
- MAXDATA SR1202 M1 – StorView 5
- 6 Contents 6
- 1 Preface 9
- 10 Preface 10
- 2 Introduction 11
- License Manager 12
- 3 StorView Quick Tour 13
- Enclosure Section 14
- Locate Enclosure 17
- Mixed Drive Types 18
- Server Sidebar Section 21
- How to Use this Document 23
- 4 Embedded StorView Setup 25
- Using Dynamic IP (DHCP) 26
- Using Static IP 26
- Getting a New IP Address 26
- 5 Getting Started 27
- 28 Getting Started 28
- Configuring E-MAIL Notices 29
- Deleting an E-MAIL Addressee 30
- Configuring SNMP Traps 31
- Changing the Password 32
- Monitoring Setting 33
- Additional Monitoring Servers 34
- 6 Storage Assistant 35
- 36 Storage Assistant 36
- 38 Storage Assistant 38
- 40 Storage Assistant 40
- Creating Disk Arrays 43
- Create the Array 45
- Initializing the Array 49
- Adding Hot Spare Drives 51
- Assigning a Global Spare 52
- Figure 32. Drive Panel Screen 53
- Figure 33. Make Spare Screen 53
- Assigning a Dedicated Spare 54
- Removing a Spare 55
- Auto Spare 55
- Create the Logical Drive 56
- Figure 38. Main Screen 57
- Saving the Configuration 59
- Figure 45. File Name Screen 61
- 8 SAN LUN Mapping 63
- 64 SAN LUN Mapping 64
- Creating a SAN LUN Mapping 65
- 66 SAN LUN Mapping 66
- Figure 48. Main Screen 66
- Deleting a SAN LUN Mapping 68
- Modifying a SAN LUN Mapping 68
- 70 SAN LUN Mapping 70
- 9 Controller Environmentals 71
- Operations 72
- Update Controller Firmware 73
- 74 Controller Environmentals 74
- Overview 75
- Advanced Settings 75
- Identity 76
- Fault Tolerance 77
- Host Ports 79
- Advanced Array Functions 81
- Modifying Arrays 82
- Verify Parity 83
- Identifying Drive Members 85
- Rebuilding an Array 86
- Figure 69. Drive Panel Screen 87
- Expanding an Array 88
- Trust an Array 89
- Restoring the Configuration 91
- Clearing the Configuration 93
- Advanced Drive Options 94
- Locate Drive 95
- Viewing Unassigned Free Space 96
- Expanding a Logical Drive 96
- Figure 85. Main Screen 97
- Deleting a Logical Drive 98
- Execution Throttle 101
- Scatter/Gather 101
- Additional StorView Functions 102
- Take Control Monitoring 103
- 13 Support and Updates 105
- 106 Support and Updates 106
- Caution 107
- 14 Event Logs 109
- 110 Event Logs 110
- Figure 97. Main Screen 110
- Figure 98. Event Log Screen 111
- 112 Event Logs 112
- Figure 100. Main Screen 113
- Figure 101. Event Log Screen 113
- 114 Event Logs 114
- Figure 104. Main Screen 115
- Figure 105. Event Log Screen 115
- Operating System Event Log 116
- List of Events 116
- Drive and Array Events 120
- Controller Port Events 125
- Enclosure Events 127
- NOTE 130
- Failed Drives Codes 133
- 15 Statistics 135
- Read-Ahead Statistics 138
- Command Cluster Statistics 139
- Introduction 141
- Sequential Access 142
- Access Size 142
- RAID 5 Sub-Array 143
- Multiple Drive Failures 143
- 17 Troubleshooting 145
- 150 Index 150
- 152 Index 152
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