Adjust Other Parameters - ATTO Technology R30F Installation And Operation Manual

Synch Offset
Choices: 0-16 for Ultra/Wide SCSI
0-62 for Ultra3 SCSI
0-127 for Ultra320
Default: 16 for Ultra/Wide SCSI
62 for Ultra3 SCSI
127 for Ultra320
Extensive testing by ATTO has determined this default
value to offer the best performance possible. Do not
change this setting unless instructed by an ATTO
Technical Support representative.
SCSI Parity Check
Choices: Enable, Disable
Default: Enabled
Initiates error parity checking of data transfers over the
SCSI bus when enabled without degrading system
performance. This option assists compatibility of
devices not supporting SCSI parity.
Exhibit 9.-2 All possible SyncRate settings for each host adapter. Default values are in bold italics.
Sync DT IU
320
UL4D, UL4S
UL4D, UL4S
160
80
40
20
10
5
5
NA
NA

Adjust other parameters

To access these options, go to the device window and
double click on a device or drive.
Tag Command Queuing
Choices: Enable, Disable
Default: Disabled
A feature of SCSI-2 and SCSI-3 protocols, allows
SCSI commands to be executed out of order by a
supporting SCSI device to increase speed for large
numbers of small I/Os.
Non-ATTO LUNs
Choices: Enable, Disable
Default: Enabled
Allows non-zero LUNs attached to third party host
adapters to mount on your desktop at boot time. If you
create an ATTO volume (RAID or non-RAID) on
19 ATTO Technology ExpressPro-Tools Installation and Operation Manual
Sync Rate
If synchronous transfers are enabled, the synch rate
sets the maximum rate at which the ExpressPCI host
adapter will negotiate with each device attached to it.
ATTO recommends setting the rate to the maximum
value supported by the host adapter.
If excessive SCSI errors occur, you have long cables or
there are many devices on the bus, you may want to
reduce the SyncRate value. Slowing the transfer rate
may increase the reliability of the SCSI bus.
Sync DT Sync ST WIDE
UL3D, UL3S, UL4D
UL4S
UL3D, UL3S, UL4D UL3D, UL3S, UL4D
UL4S
UL3D, UL3S UL4D, UL3D, UL3S, UL4D,
UL4S UL4S, DC PSC, PSCd
LUN(s), then the ATTO driver will control those
LUN(s).
This applies to both zero and non-zero LUNs. At boot
time, the ATTO driver will not scan for non-zero
LUNs unless the device is on an ATTO host adapter. If
the disk at LUN 0 has the Non-ATTO LUNs Enabled,
then the ATTO driver will continue to scan LUNs at
this ID.
Spindown before shutdown/restart
Spins a drive down so it can be removed during
shutdown.
Canister (Pseudo-Removable)
Treats hard drives like removable media to allow you
to swap drives. The drive spins down when dragged to
Choices: varies by adapter, see Exhibit 9.-2
Default: varies by adapter, see Exhibit 9.-2
Sync ST Narrow
UL4S
All
All All
All All
All
Choices: On, Off
Default: Off
Async
All