Compaq ProLiant 1000 Compaq Backup and Recovery for Microsoft SQL Server 6.X - Page 16

DLT Tape IV 35.0-GB

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Compaq Backup and Recovery for Microsoft SQL Server 6.x Compaq 15/30-GB DLT Drive Compaq 35/70-GB DLT Drive DLT Tape III (10.0-GB) DLT Tape IIIXT (15.0-GB) DLT Tape III (10.0-GB) DLT Tape IIIXT (15.0-GB) DLT Tape IV (35.0-GB) Page 16 The Compaq 10/20 and 15/30 DLT drives are available with either an internal or external standard SCSI (8-bit) interface. These drives can however, be connected to a Fast-Wide SCSI-2 controller with the appropriate cable, although half the bandwidth of the Wide SCSI-2 bus will remain unused. On EISA systems such as the Proliant 4500 using a Fast SCSI-2 or a Fast-Wide SCSI-2/E controller will yield the same performance. For best performance on Pentium-Pro based PCI systems, Compaq recommends that the Compaq Wide-Ultra SCSI controller be used with these drives; the reasons for this pertain not to the enhanced bandwidth of the Wide-Ultra SCSI bus, but rather to PCI bus utilization issues which can prove significant in terms of system throughput - especially when using multiple such controllers15. The Fast-Wide SCSI-2 controller embedded on the Proliant system board however, can be used in conjunction with additional, Wide-Ultra controllers without degrading performance. The Compaq 35/70 DLT drives are available with either an internal or external Wide SCSI-2 (16-bit) interface. Like the other DLT drives, the 35/70's should be used with the Compaq Wide-Ultra SCSI controllers on Pentium-Pro based Proliant systems if peak performance is desired. Multiple drives can exist on the same SCSI bus by Daisy Chaining them with the appropriate cables. Compaq also provides DLT Tape Array cabinets which support up to four internal DLT tape drives. The cabinets have two SCSI channels so that the drives can be attached to two separate SCSI controllers (2 drives each); or the drives can be individually attached to up to four separate controllers using additional cables. For best performance, Compaq recommends not attaching more than two DLT drives per controller; the reasons for this will be discussed later in this paper. Finally, the DLT does not interface to the Compaq SMART SCSI-2 Array controllers, which are intended only for disk drive connections.16 For unattended backup and restore functionality Compaq offers the DLT 15-Cartridge Library, which consists of one or two 15/30-GB DLT tape drive(s), along with up to 15 DLT Tape cartridges in 3 magazines for as much as 225 GB of capacity (more if compression is activated). The Library features a robot arm for automatic tape changing, as well as an integrated bar code reader to uniquely identify each cartridge and create a complete catalog of all archived data - in conjunction with supporting software. Software that supports the DLT Library includes backup products such as ARCserve 6.0 for Windows NT and its tape changer option; SQL Server cannot interface with the drive by itself. When operating in a Microsoft Windows NT 3.51 or 4.0 environment, the Compaq 10/20-GB and 15/30-GB DLT drives use the Digital TZ86, TZ87, DLT2000 driver (DLTTAPE.SYS) that ships with 15 The Wide-Ultra SCSI controller uses the 53C875 chipset, whereas the Fast-Wide SCSI-2/P controller uses the 53C825 chipset. The 53C875 makes better use of the PCI bus by transferring more data per bus ownership. 16 For details on how to implement any of the interfacing techniques mentioned in this paragraph, please refer to the appropriate product documentation.

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Compaq Backup and Recovery for Microsoft SQL Server 6.x
Page
16
Compaq 15/30-GB DLT Drive
DLT Tape III (10.0-GB)
DLT Tape IIIXT (15.0-GB)
Compaq 35/70-GB DLT Drive
DLT Tape III (10.0-GB)
DLT Tape IIIXT (15.0-GB)
DLT Tape IV (35.0-GB)
The Compaq 10/20 and 15/30 DLT drives are available with either an internal or external standard
SCSI (8-bit) interface.
These drives can however, be connected to a Fast-Wide SCSI-2 controller with
the appropriate cable, although half the bandwidth of the Wide SCSI-2 bus will remain unused.
On
EISA systems such as the Proliant 4500 using a Fast SCSI-2 or a Fast-Wide SCSI-2/E controller will
yield the same performance.
For best performance on Pentium-Pro based PCI systems, Compaq
recommends that the Compaq Wide-Ultra SCSI controller be used with these drives; the reasons for
this pertain not to the enhanced bandwidth of the Wide-Ultra SCSI bus, but rather to PCI bus utilization
issues which can prove significant in terms of system throughput - especially when using multiple such
controllers
15
.
The Fast-Wide SCSI-2 controller embedded on the Proliant system board however, can
be used in conjunction with additional, Wide-Ultra controllers without degrading performance.
The Compaq 35/70 DLT drives are available with either an internal or external Wide SCSI-2 (16-bit)
interface.
Like the other DLT drives, the 35/70’s should be used with the Compaq Wide-Ultra SCSI
controllers on Pentium-Pro based Proliant systems if peak performance is desired.
Multiple drives can exist on the same SCSI bus by Daisy Chaining them with the appropriate cables.
Compaq also provides DLT Tape Array cabinets which support up to four internal DLT tape drives.
The cabinets have two SCSI channels so that the drives can be attached to two separate SCSI
controllers (2 drives each); or the drives can be individually attached to up to four separate controllers
using additional cables.
For best performance, Compaq recommends not attaching more than two DLT
drives per controller; the reasons for this will be discussed later in this paper.
Finally, the DLT does
not interface to the Compaq SMART SCSI-2 Array controllers, which are intended only for disk drive
connections.
16
For unattended backup and restore functionality Compaq offers the DLT 15-Cartridge Library, which
consists of one or two 15/30-GB DLT tape drive(s), along with up to 15 DLT Tape cartridges in 3
magazines for as much as 225 GB of capacity (more if compression is activated).
The Library features
a robot arm for automatic tape changing, as well as an integrated bar code reader to uniquely identify
each cartridge and create a complete catalog of all archived data - in conjunction with supporting
software.
Software that supports the DLT Library includes backup products such as ARCserve 6.0 for
Windows NT and its tape changer option; SQL Server cannot interface with the drive by itself.
When operating in a Microsoft Windows NT 3.51 or 4.0 environment, the Compaq 10/20-GB and
15/30-GB DLT drives use the
Digital TZ86, TZ87, DLT2000
driver (DLTTAPE.SYS) that ships with
15
The Wide-Ultra SCSI controller uses the 53C875 chipset, whereas the Fast-Wide SCSI-2/P controller uses the
53C825 chipset.
The 53C875 makes better use of the PCI bus by transferring more data per bus ownership.
16
For details on how to implement any of the interfacing techniques mentioned in this paragraph, please refer to
the appropriate product documentation.