5111 30-Disk Expansion With Dual Line Cord Feature; High Speed Link (Hsl) On Model 830 - IBM i series Handbook

#5111 30-Disk Expansion With Dual Line Cord Feature

The #5111 is a disk unit expansion enclosure for systems and towers that are dual line cord
enabled. It includes two 15 disk unit enclosures, backplanes, and cables. Two #4748/#4778
PCI RAID Disk Unit Controllers are required to support 30 disk units.
Prerequisites:
• #5103 when ordered for a Model 830 system unit
• #5105 when ordered for a stand alone #5074 I/O Tower
• #5106 for the unit in a #5079 where this expansion enclosure is to be installed
OS/400 V5R1 plus PTFs, or later is required. Refer to Informational APAR II12950 at:
http://as400service.rochester.ibm.com/supporthome.nsf/document/10000035

High Speed Link (HSL) on Model 830

The Model 830 supports up to four HSL loops, one of which can be an Optical HSL Loop. The
Optical HSL Loop extends the distance between the 830 system unit and the I/O units from
the current 15 meters to 250 meters, which can help to improve data reliability and protection.
The Optical HSL cables are smaller and easier to work with. Optical and Copper HSL cables
may not be intermixed within a loop. Each loop supports the attachment of the #5074 I/O
towers (with the #5079 counting as two #5074s), the #5078 PCI Expansion Units, the #0578
PCI Expansion Unit in Rack, and certain external xSeries servers. Only #5074, #5079,
#0578, and #5078 may be attached to the Optical HSL loop. The Model 830 supports #503x
Migration Tower I or #5077 Migration Tower II, which provides for the migration of existing
#5073 SPD I/O towers or #5065/#5066 PCI Expansion Towers to leverage the hardware
investment in this older technology.
Due to the high bandwidth of HSL, you should see comparable performance, whether using
copper or optical HSL, even though optical runs at a slower speed. However if you have
intensive I/O bandwidth requirements (for example, large system data mining), you may
experience some performance degradation with optical HSL. We recommend you avoid using
a maximum number of I/O towers on an optical HSL loop.
The following figure shows the Model 830 and five connected towers. For further details, see
AS/400e to iSeries 400 Migration , SG24-6055.
iSeries Model 830
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iSeries Model 830