ADIC 5.4 User Manual
2
© December 2004, ADIC
New Features
These features and enhancements are new in this release of AMASS for UNIX:
•
AMASS Read Only—AMASS read only allows users to set AMASS to a read only state. You can
read from AMASS, but not write or delete. To change the state to read only we use the
read from AMASS, but not write or delete. To change the state to read only we use the
amasstat
command. The options are as follows:
Usage:
amasstat [-aicfswuy] [-t sec]
•
-a
Changes filesystem to active status.
•
-i
Changes filesystem to inactive status (reads and writes from/to open files continue).
•
-r
Changes filesystem status to read only.
•
-R
Changes filesystem status to read/write.
•
-c
Checks current status, but do not change.
•
-f
Forces status change even if timeout occurs.
•
-s
Suppresses messages from kernel.
•
-t
Time, in seconds, to wait for AMASS to go inactive.
•
-u
Displays this usage message.
•
-v
Displays the current AMASS version.
•
-w
Disables writes to AMASS when inactive (reads from open files continue).
•
-y
Suppresses confirmation and informational messages.
If
-a
,
-i
, and
-c
are not specified, then the active status of the amass filesystem is toggled.
•
Cache Size—AMASS supports up to 256 partitions and has been certified with up to 4 TB cache.
The 4 TB cache budget may be spent on a single partition or dispersed among multiple partitions.
In theory, each partition could use 4 TB cache, or up to 64 PB total; however, the total amount of
cache among all partitions has only been certified up to 4 TB.
The 4 TB cache budget may be spent on a single partition or dispersed among multiple partitions.
In theory, each partition could use 4 TB cache, or up to 64 PB total; however, the total amount of
cache among all partitions has only been certified up to 4 TB.
•
drivestat—Three new command line options have been added to this tool.
•
-r
Resets device runtime state flags to initial condition.
•
-j
Resets device eject state flags to initial condition.
The
-rj
option addresses a drive in an active state, but has no work scheduled for the drive.
This situation arises after a volume, stuck in a drive, has been cleared offline. After restoring
the drive to an active state, the drive remains idle. The
the drive to an active state, the drive remains idle. The
-rj
option will remove the drive state
at the time of failure and restore the drive to its initial conditions. AMASS will assume and trust
the operator to have cleared the drive and put the media away.
the operator to have cleared the drive and put the media away.
The
-rj
option cannot be run on an active drive.
•
-D
Displays detailed amass debug logging.
The
-D
option has been a hidden option for several release cycles and one AMASS support
person has instructed users how to use it. It is now part of the standard
-u
usage output.
Usage:
drivestat -D
<device-number> <juke-number> <debug-option>; where <debug-
option> is defined as the arithmetic sum of the following:
•
0 = Resets all debug flags.
•
1 = Sets scsi_debug flag.
•
2 = Sets drvfd_debug flag.