HP NetServer LXr Pro8 Installing IBM OS/2 on an HP Netserver - Page 4

Tip 3) Formatting Disk Partitions Larger than 2 GB, Tip 4) Device Allocation under OS/2

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logical parameters of 255 heads and 63 sectors to support drives up to about 8 GB in capacity. Standard SCSI translation, with 64 heads and 32 sectors, is limited to a maximum capacity of 1024 MB (1 GB). You can enable Extended SCSI translation in the BIOS Configuration section of the EISA Configuration Utility options for the D2078A/B EISA Fast SCSI-2 Host Adapter. This information also holds true for the embedded AIC7870 SCSI Host Adapter. Tip 3) Formatting Disk Partitions Larger than 2 GB If you need to format a disk partition larger than 2 GB, use the HPFS file system. Disk partitions formatted with the FAT file system (also used by DOS) cannot exceed 2048 MB (2 GB), while HPFS file system partitions can be as large as 64 GB. NOTE: Boot drive partitions must be less than or equal to 2 GB, whether you use FAT or HPFS. On a hot-swap drive connected to an Adaptec 2940 SCSI adapter, a partition larger than 1024MB cannot be formatted using the FAT file system. You should either connect hot-swap drives to an embedded SCSI channel, or create smaller partitions when using the FAT file system. Tip 4) Device Allocation under OS/2 If you install two device drivers (each using a different device manager) that attempt to access the same device at the same time, a sharing conflict may result. The OS/2 SCSI device manager, OS2SCSI.DMD, allocates a device at the drivers' request. Because there is nothing in the ASPI specification regarding device allocation, OS2ASPI.DMD relies on other device managers to share devices fairly. Allocation by OS2SCSI.DMD may prevent OS2ASPI.DMD from accessing the device. For example, a problem could arise if a tape application using OS2SCSI.DMD and another tape application using OS2ASPI.DMD attempt to access the tape at the same time. Tip 5) RAM Greater Than 192 MB In systems with more than 192 MB of RAM, a Trap E may occur during boot after LAN Services is installed. To avoid this problem, do not select auto cache size for the HPFS file system during installation of LAN Services. HP recommends an HPFS cache size of 16 MB or less. If this problem persists, boot from the OS/2 installation diskettes, exit to a command prompt, and edit the CONFIG.SYS file. (You may have to copy the CONFIG.SYS file to a floppy disk, edit it on another system, and then copy it back.) Ensure that the line starting with IFS= near the beginning of the file contains the parameter /C:16000. An alternative is to remove RAM so that the system has less than 192 MB, reboot and reconfigure LAN Services, and then shut down and reinstall the RAM. Tip 6) Performance Tuning IBM publishes a performance White Paper, OS/2 2.1 Performance Tuning for End Users, that 4

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logical parameters of 255 heads and 63 sectors to support drives up to about 8 GB in capacity.
Standard SCSI translation, with 64 heads and 32 sectors, is limited to a maximum capacity of
1024 MB (1 GB). You can enable Extended SCSI translation in the BIOS Configuration section
of the EISA Configuration Utility options for the D2078A/B EISA Fast SCSI-2 Host Adapter.
This information also holds true for the embedded AIC7870 SCSI Host Adapter.
Tip 3) Formatting Disk Partitions Larger than 2 GB
If you need to format a disk partition larger than 2 GB, use the HPFS file system. Disk partitions
formatted with the FAT file system (also used by DOS) cannot exceed 2048 MB (2 GB), while
HPFS file system partitions can be as large as 64 GB.
NOTE: Boot drive partitions must be less than or equal to 2 GB, whether you use FAT or
HPFS.
On a hot-swap drive connected to an Adaptec 2940 SCSI adapter, a partition larger than 1024MB
cannot be formatted using the FAT file system. You should either connect hot-swap drives to an
embedded SCSI channel, or create smaller partitions when using the FAT file system.
Tip 4) Device Allocation under OS/2
If you install two device drivers (each using a different device manager) that attempt to access
the same device at the same time, a sharing conflict may result. The OS/2 SCSI device manager,
OS2SCSI.DMD, allocates a device at the drivers' request. Because there is nothing in the ASPI
specification regarding device allocation, OS2ASPI.DMD relies on other device managers to
share devices fairly. Allocation by OS2SCSI.DMD may prevent OS2ASPI.DMD from accessing
the device. For example, a problem could arise if a tape application using OS2SCSI.DMD and
another tape application using OS2ASPI.DMD attempt to access the tape at the same time.
Tip 5) RAM Greater Than 192 MB
In systems with more than 192 MB of RAM, a Trap E may occur during boot after LAN
Services is installed. To avoid this problem, do not select auto cache size for the HPFS file
system during installation of LAN Services. HP recommends an HPFS cache size of 16 MB or
less.
If this problem persists, boot from the OS/2 installation diskettes, exit to a command prompt, and
edit the CONFIG.SYS file. (You may have to copy the CONFIG.SYS file to a floppy disk, edit it
on another system, and then copy it back.) Ensure that the line starting with
IFS=
near the
beginning of the file contains the parameter
/C:16000
. An alternative is to remove RAM so that
the system has less than 192 MB, reboot and reconfigure LAN Services, and then shut down and
reinstall the RAM.
Tip 6) Performance Tuning
IBM publishes a performance White Paper,
OS/2 2.1 Performance Tuning for End Users
, that