HP Portable 386 Compaq Portable 386 Personal Computer Maintenance and Service - Page 164

that supports Novell System Fault Tolerant SFT NetWare operation SFT I

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If the fixed disk drive expansion unit is configured at the primary address, that fixed disk drive must contain a primary DOS partition. The primary partition is created with the menu driven FDISK utility which contains an extended partition. The total number or logical drives on your system may not exceed 24. The FORMAT Command After using the FDISK to partition the fixed disk drive, use the FORMAT command on the EXTDISK diskette to format each logical drive on the fixed disk drive. For information on using the FORMAT command, refer to your MS-DOS Reference Guide. Novell Netware Configuration Information A key feature of the fixed disk drive expansion unit is disk driver software that supports Novell System Fault Tolerant (SFT) NetWare operation (SFT I and SFT II). SFT LAN operation helps ensure data integrity by duplicating data files on a second fixed disk drive and by performing a write verification. Three disk configurations that achieve fault tolerant operation are SFT I, SFT II (disk mirroring), and SFT II (disk duplexing). o SFT I (write verification with "Hot Fix") confirms each write and automatically corrects erroneous writes by relocating data to another portion of the fixed disk drive. o SFT II (disk mirroring) helps ensure uninterrupted system operation without data loss if a fixed disk drive fails. Disk mirroring requires a single fixed disk drive controller and two identical fixed disk drives. The Novell ATDISK driver supports SFT II (disk mirroring) for a single disk controller system. The COMPAQ CPQDSK and NVCPQDSK drivers support SFT II (disk mirroring) for a single or dual disk controller system. o SFT II (disk duplexing) goes beyond disk mirroring in both fault tolerance and performance. It helps ensure continuous system operation if either a fixed disk drive or a controller fails. It improves performance by simultaneously servicing two disk write or read requests and by selecting the fixed disk drive that is best able to service a given read request. Duplexed drives typically perform write and read operations twice as quickly as mirrored drives. Disk duplexing requires two fixed disk drive controllers and two identical fixed disk drives. The EXTDISK diskette contains two versions of the Value Added Disk Driver (VADD) for Novell NetWare: CPQDSK and NVCPQDSK. Both versions operate in all servers running Novell NetWare (V2.1x). The two versions are identical except that CPQDSK performs a write verification and NVCPQDSK does not. NVCPQDSK executes fixed disk drive write operations over two times faster than CPQDSK because it does not perform read after write verification. The probability of unrecoverable disk write errors with mirrored or duplexed drives is very low, since erroneous data on one fixed disk drive can usually be recovered from the second. Disk configurations that do not use mirroring or duplexing depend on the inherent reliability of the fixed disk drive and tape drives as the only protection against disk errors. Use NVCPQDSK with mirrored or duplexed fixed disk drive configurations that require maximum performance. NOTE: Execution of the NetWare UNMIRROR console command terminates the use of

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If the fixed disk drive expansion unit is configured at the primary address,
that fixed disk drive must contain a primary DOS partition. The primary
partition is created with the menu driven FDISK utility which contains an
extended partition. The total number or logical drives on your system may
not exceed 24.
The FORMAT Command
After using the FDISK to partition the fixed disk drive, use the FORMAT
command on the EXTDISK diskette to format each logical drive on the fixed disk
drive. For information on using the FORMAT command, refer to your MS-DOS
Reference Guide.
Novell Netware Configuration Information
A key feature of the fixed disk drive expansion unit is disk driver software
that supports Novell System Fault Tolerant (SFT) NetWare operation (SFT I and
SFT II). SFT LAN operation helps ensure data integrity by duplicating data
files on a second fixed disk drive and by performing a write verification.
Three disk configurations that achieve fault tolerant operation are SFT I, SFT
II (disk mirroring), and SFT II (disk duplexing).
o SFT I (write verification with "Hot Fix") confirms each write and
automatically corrects erroneous writes by relocating data to another
portion of the fixed disk drive.
o SFT II (disk mirroring) helps ensure uninterrupted system operation without
data loss if a fixed disk drive fails. Disk mirroring requires a single
fixed disk drive controller and two identical fixed disk drives. The
Novell ATDISK driver supports SFT II (disk mirroring) for a single disk
controller system. The COMPAQ CPQDSK and NVCPQDSK drivers support SFT II
(disk mirroring) for a single or dual disk controller system.
o SFT II (disk duplexing) goes beyond disk mirroring in both fault tolerance
and performance. It helps ensure continuous system operation if either a
fixed disk drive or a controller fails. It improves performance by
simultaneously servicing two disk write or read requests and by selecting
the fixed disk drive that is best able to service a given read request.
Duplexed drives typically perform write and read operations twice as
quickly as mirrored drives. Disk duplexing requires two fixed disk drive
controllers and two identical fixed disk drives.
The EXTDISK diskette contains two versions of the Value Added Disk Driver
(VADD) for Novell NetWare: CPQDSK and NVCPQDSK. Both versions operate in all
servers running Novell NetWare (V2.1x). The two versions are identical except
that CPQDSK performs a write verification and NVCPQDSK does not.
NVCPQDSK executes fixed disk drive write operations over two times faster
than CPQDSK because it does not perform read after write verification. The
probability of unrecoverable disk write errors with mirrored or duplexed
drives is very low, since erroneous data on one fixed disk drive can usually
be recovered from the second. Disk configurations that do not use mirroring
or duplexing depend on the inherent reliability of the fixed disk drive and
tape drives as the only protection against disk errors. Use NVCPQDSK with
mirrored or duplexed fixed disk drive configurations that require maximum
performance.
NOTE: Execution of the NetWare UNMIRROR console command terminates the use of