DEC CI Hierarchical Storage Controllers

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DEC built a whole series of HSC controllers beginning with the HSC50 and ending with the HSC95.

See the following table for characteristics and upgradability of the HSC models:

DEC HSC Controllers
Model HSC50 HSC70 HSC40 HSC90 HSC60 HSC95 HSC65
Introduction 1983 1986 1989 1991 1991 1993 1993
Peak I/O per s 550 1150 800 1300 1300 1800 1800
max. # of channels 6 8 3 8 3 8 3
max. # of devices 24 32 12 48 20 48 32
Upgrades to HSC60 x
Upgrades to HSC70 x
Upgrades to HSC90 x x x
Upgrades to HSC65 x x
Upgrades to HSC95 x x x x x

HSC Channel Interfaces

A Channel is a pluggable HSC interface to either hard drives, tape drives, or both, depending on the channel module. The number of devices that can be connected also depends on the channel module.

HSC controllers may contain a mix of the following data channel module options:

  • HSC5X-BA (L0108-YA) K.SDI INTERFACE KIT TO 4 SDI DISK DRIVES
  • HSC5X-CA (L0108-YB) K.STI INTERFACE KIT TO 4 STI TAPE FORMATTERS
  • HSC5X-LA (?) HSC5X-BA WITH SUPPORT FOR TOPS-10/20 (18 BIT)
  • HSC5X-DA (L0119-YA) K.SI INTERFACE KIT TO 4 SDI DISK DRIVES OR 4 STI TAPE FORMATTERS
  • HSC5X-FA (L0119-YB) 8-PORT DISK DATA CHANNEL DISK/TAPE DATA CHANNEL (not supported by HSC50, HSC70, and HSC40)
  • HSC9X-SX (L0131-AA) K.SCSI SCSI DISK DATA CHANNEL (not supported by HSC50)

Configuration of HSC Controller Models

Configuration of HSC Controller Models
Item Name Engineering
Designation 		Module
Designation 		HSC90 HSC70 HSC60 HSC50 HSC40
Port processor K.pli L0107–YA --- X --- X X
K.pli2 L0124–AA X --- X --- ---
Port link LINK L0100 E2
L0118–00 		--- X --- X X
LINK2 L0118–YA X --- X --- ---
Port buffer PILA L0109 --- X --- X X
PILA2 L0125–AA X --- X --- ---
I/O control processor P.ioc L0105–00 --- --- --- X ---
P.ioj L0111–00 --- X --- --- ---
P.ioj L0111–YA --- --- --- --- X
Pioj-18 L0111–YC X --- --- --- ---
P.ioj-18 L0111–YD --- --- X --- ---
Memory M.std L0106–AA --- --- --- X ---
M.std2 L0117–AA --- X --- --- X
M.std4 L0123–AA X --- X --- ---
32-Mbyte Cache M.cache L0121–AA Option --- Option --- ---
Disk data channel K.sdi L0108–YA Option Option Option Option Option
Tape data channel K.sti L0108–YB Option Option Option Option Option
Disk/tape data channel K.si 4-port L0119–YA Option Option Option Option Option
Disk data channel K.si 8-port L0119–YB Option --- Option --- ---
SCSI Disk data channel K.scsi L0131–AA Option Option Option Option ---
Maximum data channels --- --- 8 8 3 6 3
Maximum ports --- --- 48 32 20 24 12
Load devices --- --- RX33 RX33 RX33 TU58 RX33
Aux power supply --- --- X X 1) 2) ---

1) The HSC60–AA/AB/BA/BB without the cache option does not have an auxiliary power supply. The HSC60–AA/AB/BA/BB with the cache option has the auxiliary power supply installed. The auxiliary power supply is supplied as part of the HSC6X-BA/BB cache option installation kit.

2) If the HSC50 has four or more requestors, it requires an auxiliary power supply.

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