hba0-loop-down-timeout
Time the driver will wait for a Fibre Channel loop to come up before reporting
the failure. Small values may report transient errors that should be ignored.
Valid Values 0 - 240 (sec)
Default Value 60
IV. HOST CONFIGURATION FILES AND VARIABLES
1. /etc/system file
The following variables in the /etc/systems file should be set to
maximize system performance. If any of these variables are changes the
system must be reboot for changes to take effect.
sd_max_throttle
The sd_max_throttle variable is the maximum number of commands
that the SCSI sd driver will attempt to queue to the HBA
driver(qla2100). The default value is 256. This variable should
be set to a value less than or equal to the maximum queue depth of
each lun connected to each instance of the sd driver. If this is
not done, then commands may be rejected because of a full queue
condition and the sd driver instance that receives the queue full
message will throttle down sd_max_throttle to 1. This will
result in degraded performance. The variable is set in the
/etc/system file as following:
set sd:sd_max_throttle=20
sd_io_time
The sd_io_time variable is command time out value. Setting this time out
value to 120 seconds will prevent the host from issuing warning messages
while non-disruptive operations are performed on the Symmetrix. In a power
path environment this variable can be set to 0x3C (60 seconds)
set sd:sd_io_time = 0x78
scsi_options
The value scsi_options is a setting for SCSI options included as outlined in the
bit meaning table bellow. Solaris 7 default SCSI settings are maximum Ultra
Wide Speed. Since the /etc/system file can also affect other disks in the
system, consider the effects of implementing the scsi_options=0x7F8 mask on
the other disks.
set scsi_options=0x7F8
2. /kernel/drv/sd.conf
You must modify the host configuration files /kernel/drv/sd.conf to insure
smooth integration from the host and Symmetrix.
Symmetrix devices are addressed on the Fibre Channel bus using the
Symmetrix Hard Loop ID as a Target ID. There can be only one Target ID
per Symmetrix port. A Target ID can have up to 128 luns. By default,
Solaris X86 searches only for Target IDs; if LUN addressing is required,
you must modify the file /kernel/drv/sd.conf. Definition lines must be added
to sd.conf for every LUN of every target configured to the host in the
Symmetrix. In a hubless connection, all Symmetrix ports can have the
(13 paginas)
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