presto.conf(4) CLIX presto.conf(4)
NAME
presto.conf - Configuration data for Prestoserve
DESCRIPTION
The presto.conf contains information about the file systems to be
accelerated. The file lists all files to be accelerated by use of the
presto -U command, as well as the list of disk drives that are to use an
alternate ID checking method upon reboot of the system after an unclean
shutdown.
The file consists of lines containing a keyword, whitespace, and
additional text required by the keyword. Lines beginning with a number
sign (#) are ignored, and lines containing recognized keyword may appear
in any order. The recognized keywords and any additional parameters to be
given on the line are as follows:
prestoserve special devicename
Specifies a file system to be "presto-sized". The special
devicename is the block device that contains the file system, for
example, /dev/dsk/s3u0p7.3. The -U option locates this line.
check-sysid disk drive specification
Selects a simpler (or weaker) check to see if dirty buffers need
flushing to a particular disk upon rebooting after an unclean
shutdown. The default action checks the data written to partition
6.0 on the retrospective drive for each accelerated file system
against data found in the non-volatile memory of the Prestoserve
board. If the data matches, then the dirty buffers for the
Prestoserve board may be flushed to the disk. If the data does not
match, then the data is retained, and the Prestoserve board enters
the ERROR state. The presto -L command may be used to list the
file systems to which dirty buffers exist along with the status of
BAD MARK.
If you want to accelerate a file system on a drive to which you
cannot add partition 6.0, then you must add a check-sysid line for
every disk containing a file system you want to accelerate. This
weaker check merely checks that the system board has not changed
since the unclean shutdown and assumes it is safe to flush all
dirty buffers destined for the specified disks. Therefore, if the
disk drives are swapped after an unclean shutdown and check-sysid
is specified for these disk drives, then data may be erroneously
flushed to the wrong drive(s) and damage the file system(s).
To specify the disk drives for the weaker check-sysid, include a
line in the file for each disk. For quad-SCSI devices, use the
following format:
qbcsiul...
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presto.conf(4) CLIX presto.conf(4)
where:
b Board number (0,1)
c Channel number (0-3)
i SCSI ID for device (0-6)
l LUN ID for device (0,1)
For system SCSI devices, use the following format:
siul...
where:
i SCSI ID for device (0-6)
l LUN ID for device (0,1)
The "..." indicates that anything following is ignored. The device
specifications match the ones found in the /etc/fstab entries for
mounting file systems, except that the partition.modifier
information is not needed since checking mode applies to a complete
disk drive.
EXAMPLE
In the following configuration file, a number sign (#) indicates that a
comment follows and is ignored by the system.
# PrestoServe Configuration File
#
# Use only system-id check for the following disk drives:
#
check-sysid s2u0
check-sysid q00s0u0
check-sysid q01s0u0
#
# Presto-ize the following filesystems when executing "presto -U":
#
prestoserve /dev/dsk/s2u0p7.3
prestoserve /dev/dsk/s2u0p7.4
prestoserve /dev/dsk/s3u0p7.3
prestoserve /dev/dsk/q00s0u0p7.3
prestoserve /dev/dsk/q00s1u0p7.3
prestoserve /dev/dsk/q01s0u0p7.3
FILES
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presto.conf(4) CLIX presto.conf(4)
/etc/presto.conf
RELATED INFORMATION
Commands: presto(8)
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