User Guide
Overview of Server Disks and Storage Devices 19
NetWare Server Disks and Storage Devices Administration Guide
103-000179-001
August 30, 2001
Novell Confidential
Manual 99a38 July 17, 2001
Read redirection occurs following a disk error during a read request.
If the disk is mirrored, the system retrieves the data from the mirrored
disk and redirects the data on the primary disk. If the disk isn't mirrored,
the data is lost, and the block is marked as bad.
Read-after-write-verify redirection occurs after data is written to disk.
The data on disk is then read and compared to that in memory. If the two
don't match, the system marks the block as bad and redirects the data to a
different block.
By default, 2% of a disk's space is set aside as the Hot Fix Redirection Area.
You can increase or decrease this amount when you create a partition.
If Hot Fix is enabled, it is always active unless the disk fails or the redirection
area is full. You can view Hot Fix activity in MONITOR by selecting Storage
Devices and then a Hot Fix partition.
Figure 5 Hot Fix
You can specify no Hot Fix Redirection Area when you create disk partitions.
Having no Hot Fix Redirection Area saves partition space. Eliminating the
Hot Fix Redirection Area might be recommended for large (Redundant Array
of Inexpensive Devices (RAID) systems that provide their own means of fault
tolerance.
Disk
Hot Fix
Redirection Area
Server RAM
If verification fails,
then data is written
to the Hot Fix
Redirection Area.
1
Location of the bad
block is recorded.
Data
Block 201
Data
Block 201
is bad.
2