IBM eServer iSeries 8 Series, Руководство пользователя

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Additional disk unit controllers are not allowed in SB2 and SB3 system units.
870 and 890 system unit
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IOPs control IOAs in the direction of the arrows in the PCI bridge sets.
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SCSI in the diagram indicates the first internal disk unit controller position
(cards 2757, 4778, 4748, 9748 or 9778). The first disk unit controller card must be
in C03 and connect the load source disk unit internal tape and CD-ROM or
DVD.
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In addition, two disk unit controllers are allowed in 830 or 840 system units.
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Upgrading the System Unit from Operations Console to Twinaxial Console (5540) V5R2