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
Содержание miSAN-V6
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