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Appendix B. Using the DS6000 with iSeries 343
Prior to multipath being available, some customers used OS/400 mirroring to two sets of
disks, either in the same or different external disk subsystems. This provided implicit
dual-path as long as the mirrored copy was connected to a different IOP/IOA, BUS, or I/O
tower. However, this also required two copies of data. Since disk level protection is already
provided by RAID-5 or RAID-10 in the external disk subsystem, this was sometimes seen as
unnecessary.
With the combination of multipath and RAID-5 or RAID-10 protection in the DS6000, we can
provide full protection of the data paths and the data itself without the requirement for
additional disks.
Avoiding single points of failure
In Figure B-22, there are fifteen single points of failure, excluding the iSeries itself and the
DS6000 storage facility. Failure points 9-12 will not be present if you do not use an
Inter
Switch Link
(ISL) to extend your SAN. An outage to any one of these components (either
planned or unplanned) would cause the system to fail if IASPs are not used (or the
applications within an IASP if they are).
Figure B-22 Single points of failure
When implementing multipath, you should provide as much redundancy as possible. As a
minimum, multipath requires two IOAs connecting the same logical volumes. Ideally, these
should be on different buses and in different I/O racks in the iSeries. If a SAN is included,
separate switches should also be used for each path. You should also use Host Adapters in
different I/O drawer pairs in the DS6000. Figure B-23 on page 344 shows this.
6. Port
7. Switch
8. Port
1. IO Frame
2. BUS
3. IOP
4. IOA
5. Cable
9. ISL
13. Cable
10. Port
11. Switch
12. Port
14. Host Adapter
- The IBM TotalStorage 1
- DS6000 Series: Concepts 1
- Contents ix 11
- LSS X'17' 100
- LSS X'18' 100
- DB2-test 100
- 4.2.7 Address groups 101
- 4.2.8 Volume access 101
- Host attachment 102
- Volume group 102
- 4.2.10 Placement of data 104
- Host LVM volume 105
- 5.1 DS6000 highlights 108
- 5.1.2 DS6000 Model 1750-EX1 109
- Loop 0) 111
- Loop 1) 111
- Controller 0 112
- Controller 1 112
- Copy Services 113
- 6.2 Copy Services functions 114
- Source Target 115
- 6.2.2 FlashCopy options 116
- Incremental FlashCopy 117
- Waiting write operation 119
- FlashCopy to 120
- PPRC Primary 120
- Persistent FlashCopy 121
- Global Copy (PPRC-XD) 122
- Server write 123
- Write to secondary 123
- (non-synchronously) 123
- Write acknowledge 123
- How Global Mirror works 124
- Global Mirror - How it works 125
- 127
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