Configuration Tips for the Netfinity EXP15
Configuration Tips for the Netfinity EXP15
- When connecting a Netfinity EXP15 to an IBM ServeRAID adapter in a clustered environment, you
must configure all ten drive bays as a single SCSI bus.
To configure the Netfinity EXP15 drive bays as a single SCSI bus, set Option Switch 1 to the Off or down position.
- When connecting a Netfinity EXP15 to a Netfinity Fibre Channel RAID Controller in a clustered
environment, you can configure the drive bays as a ten-drive SCSI bus, or as two five-drive SCSI buses.
To configure the Netfinity EXP15 as a ten-drive SCSI bus, set Option Switch 1 to the Off or down position.
To configure the Netfinity 15 as two, five-drive SCSI buses, set Option Switch 1 to the On or up position.
- When configured as a single SCSI bus, the drive SCSI ID assignments alternate between low and high addresses.
When configured as two independent SCSI buses, duplicate SCSI IDs are assigned to the drives.
In certain configurations, this might cause some confusion.
To avoid confusion with the SCSI IDs, consider placing a label with the SCSI IDs across the front of the drive bays.
The SCSI ID assignments from left (bay 1) to right (bay 10) are as follows:
As a single, ten-drive SCSI bus: 0 8 1 9 2 10 3 11 4 12
As two, five-drive SCSI buses: 0 0 1 1 2 2 3 3 4 4
- Each ServeRAID adapter supports up to eight logical drives.
If a failure occurs, the remaining ServeRAID adapter will need to support its own logical drives and the logical drives of its counterpart
in the failing server.
Therefore, the total number of shared logical drives for each set of ServeRAID adapters must not exceed eight.
A good way to ensure that you do not exceed this limit would be to define no more than four logical drives for each ServeRAID adapter.
- With the ServeRAID II adapter, you can set the stripe-unit size to 8 K (the default), 16 K, 32 K, or 64
K. After you set a stripe-unit size and store data on the logical drives, you cannot change the size
without destroying data in the logical drives. Both adapters in a pair must use the same stripe-unit
size.
- When the stripe-unit size is set to 8 K or 16 K, the maximum number of physical hard disk drives
in an array is 16.
- When the stripe-unit size is set to 32 K or 64 K, the maximum number of physical hard disk drives
in an array is eight.
- When using the Vinca High Availability for NetWare program, refer to the NetWare documentation for
information about calculating the amount of system memory needed to support the number and
capacity of hard disk drives you intend to install.
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