Externally Attached Automated Libraries 381
Externally Attached Automated Libraries
The Model E11 includes a ten-cartridge Automatic Cartridge Facility (ACF) with a cartridge
magazine. This magazine has a random mode operation feature that allows random access
to any cartridge in the ACF. Status indicators on each cell of the ACF alert the operator to
conditions that may need to be addressed. The 10-cartridge ACF, coupled with increased
capacity of the 3590 cartridge, reduces the frequency for operator interaction with the tape
subsystem.
The increased capacity of the 3590 cartridges allows the ACF to typically contain from
200 GB or 400 GB native to 600 GB or 1.2 TB with a 3:1 compression ratio of data using
appropriate media. Other standard features include a 16 MB dynamic data buffer, an
improved data compression, auto-blocking of small records, and one-pass-read-after write.
Drive reliability includes the use of an enhanced error correction code and the use of servo
tracks for read and write.
The IBM 3590 Exx models have a 14 MB/s device data rate, which is 50% faster than IBM
3590 Model B11/B1A Tape Drives. With compression, the 3590 drive on the iSeries or
AS/400e server may achieve a sustained data rate of up to 17 MB/sec with compression or
60 GB per hour for large files. The actual throughput achieved in a system environment is a
function of many components, such as system processor, disk data rate, data block size, data
compressibility, I/O attachments, and the system or application software used.
Up to four Model E11s can be installed in a rack, which, therefore, reduces the floor space
required. Each drive has an operator panel with a display and menu control switches for use
by the operator. The Magstar 3590 Model E11 Tape Drive can be attached to all iSeries or
AS/400e servers capable of supporting these attachments:
• #6501 AS/400 Magnetic Media Subsystem Controller (interposer (#9410) is required)
• #6534 AS/400 Magnetic Media Controller
• #2749 PCI Ultra Magnetic Media Controller (V4R5)
• #2765 PCI Fibre Channel Tape Controller (V5R1)
Each AS/400 Magnetic Media Subsystem Controller (#6501) has two SCSI ports that support
one tape subsystem per SCSI port. Tape and DASD cannot be attached to the same feature
#6501. iSeries and AS/400e servers do not support two or more systems connected to the
same SCSI path.
Each Magstar 3590 tape drive has two ports, so each port can be connected to a different
iSeries or AS/400e server and the 3590 can be shared between two systems. The default
configuration of a 3590 is a two port SCSI differential interface which can attach to the
AS/400 and iSeries servers using #6501, #6534, or #2749.
The 3590 can be connected to the iSeries 270, 8xx, or SBx servers via a Fibre Channel
beginning with OS/400 V5R1. Feature #9510 Fibre Channel Attachment Plant Install replaces
the SCSI ports with two Fibre Channel ports on a new drive. An existing 3590 can be
converted from SCSI to Fibre Channel by ordering feature #3510 Fibre Channel Attachment
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