Synchronous replication 2 of 2 13 42 asynchronous

Synchronous replication (2 of 2) ................................................................ 13 - 42
Asynchronous replication (1 of 2) ............................................................... 13 - 43
Asynchronous replication (2 of 2) .............................................................. 13 - 44
Comparing replication modes ................................................................... 13 - 45
HP StorageWorks Storage Mirroring .......................................................... 13 - 47
SWSM mirroring – full .............................................................................. 13 - 48
SWSM mirroring – file difference ............................................................... 13 - 49
Lab activity ............................................................................................. 13 - 50
Module 14 - Performance
Objectives ................................................................................................ 14 - 1
SAN performance objectives ....................................................................... 14 - 2
Performance factors ................................................................................... 14 - 4
Response time ........................................................................................... 14 - 7
Bus utilization ............................................................................................ 14 - 8
Device utilization ....................................................................................... 14 - 9
SAN performance Considerations ............................................................... 14 - 11

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Latencies ................................................................................................ 14 - 13
ISL oversubscription .................................................................................. 14 - 15
Hop latency ............................................................................................ 14 - 17
Data Priority – Quality of Service ............................................................... 14 - 19
Device attachment points .......................................................................... 14 - 21
Place fastest switches in the core ................................................................ 14 - 22
Distance considerations ............................................................................ 14 - 24
Maintaining performance in an extended SAN beyond 5 or 10km ................ 14 - 25
Distributed fabrics .................................................................................... 14 - 26
Long distance link modes ......................................................................... 14 - 27
Extended distance topology ...................................................................... 14 - 28
Performance Guidelines within the SAN ..................................................... 14 - 29
Determining the required bandwidth .......................................................... 14 - 30
Drive selection and performance ............................................................... 14 - 32
RAID and RAID selection .......................................................................... 14 - 34
RAID level efficiency ................................................................................. 14 - 36
Disk Performance ..................................................................................... 14 - 37
Planning a disk system ............................................................................. 14 - 38
Data caching technologies ....................................................................... 14 - 41
Write-back caching ................................................................................. 14 - 43
Write-back cache benefits ........................................................................ 14 - 45
Effects of cache ....................................................................................... 14 - 47
Application effects on performance ............................................................ 14 - 49
Environment profiling ............................................................................... 14 - 50
Large sequential read environment ............................................................. 14 - 51
Server Application ................................................................................... 14 - 52
Improving performance ............................................................................ 14 - 56
Comparing VRAID1 and VRAID5 .............................................................. 14 - 57
Safe IOPs calculator for production disk group ............................................ 14 - 59
Safe IOPs calculator — Microsoft version .................................................... 14 - 61
EVAPerf .................................................................................................. 14 - 62
End to End monitoring .............................................................................. 14 - 65
Top talker ............................................................................................... 14 - 66
Lab activity ............................................................................................. 14 - 68

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8 -1
iSCSI
Module 8
Objectives

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IP storage
IP storage
•
IP storage can combine the following functions on a single
enterprise network:
− Storage
− Data sharing
− Web access
− Device management using SNMP
− E-mail
− Voice and video transmission
•
With many of the benefits that Fibre Channel SANs
already give to us.
The amount of data stored has been doubling every year and this has been
attributed to the phenomenal growth in software applications, such as on-line
transactions, e-mail, and the development of complex e-commerce applications. The
Internet and corporate intranets drive this growth to an extent where there is an
almost mandatory requirement for continuous availability of information in the
corporate e-business world. The net effect of this trend has been the duplication of
on-line copies of this monumental quantity of data. This increasing appetite to
consume disk storage has been met by the disk drive industry to double the capacity
of hard disk drives and to reduce the price of storage.
The pervasiveness of the Internet Protocol (IP) through the unprecedented growth of
the Internet and the increasing demand of disk storage has led to the question as to
whether or not it is possible to use TCP/IP, the networking technology of Ethernet
LANs and the Internet, for use in disk storage.