Instruction manual

50 Operating the Web Control Panel
Cybernetics UM-MV-86-B1-0801
An miSAN-V-Series with two standalone drives and one changer, Base SCSI ID set to
2, and Device ID Order set to “Stacker then drives,” will use SCSI IDs as follows:
An miSAN-V-Series with two virtual stackers, each with two virtual tape drives, with
Base SCSI ID set to
0, and Device ID Order set to “Drives then stacker,” will use SCSI
IDs as follows:
Host vs. job I/O policy
When host backup and restore jobs use the HSTC’s disk input/output (I/O)
resources, these disk I/O resources are called “host I/O” resources. When the
HSTC’s disk I/O resources are used for jobs such as offloading disk to tape, these
disk I/O resources are called “job I/O” resources.
The “Host vs. job I/O policy” setting is used to control the priority given to job I/O
resources relative to host I/O resources. The option you choose for this setting
determines the policy the HSTC will use when allocating I/O resources.
The options are as follows:
•
Concurrent – Host I/O and job I/O may proceed concurrently
•
Host disk write exclusive – Job I/O is disabled only on disks the host is
writing to
•
Host disk exclusive – Job I/O is disabled only on disks the host is reading
from or writing to
•
Host write exclusive – All job I/O is disabled when a host is writing to any
disk
•
Host exclusive – All job I/O is disabled when a host is reading from or writing
to any disk
When one of the policy options other than
Concurrent is selected and a host
begins using disk I/O resources, any running job I/O on the disk(s) affected by the
ID Device
2 Stacker
3 Master (first) standalone drive
4 Slave (second) standalone drive
ID Device
0 Master tape drive, first stacker
1 Slave tape drive, first stacker
2 First stacker
3 Master tape drive, second stacker
4 Slave tape drive, second stacker
5 Second stacker