ATTO Technology iPBridge 1550, Installation And Operation Manual

Page: 37 / 72

28
Troubleshooting
optimal size for the particular SCSI device(s)
connected to the iPBridge.
Checking the host system
The faster the host, the faster your transfer times are.
The work flow goes only as fast as the slowest
connection in the host system, so transferring data
from an IDE drive, 100Mb connection, a DLT 4000, a
high speed RAID volume across the country, or other
applications, slows the system no matter how fast
everything else is in the system.
1 Verify that the iSCSI storage adapter or NIC is
connected to the fastest PCI bus connector
supported by the adapter or NIC.
If the adapter supports PCI-X, place the
adapter in a PCI-X slot. If one is not available,
the host might not achieve the optimal
performance capable from the adapter.
Even placing a PCI-X adapter into a 64 bit 66
MHz slot loses performance. Some adapters
adjust clock speed depending on the speed of
the PCI slot into which they are plugged.
2 The host OS disk and swap disk/partition/file
should be on a high speed drive such as a SCSI
drive to minimize the time needed to access the
host’s virtual memory.
The more memory a system has, the less time
it spends accessing virtual memory (hard drive
space).
Checking the Operating System
If possible, eliminate swap space and virtual drives
which require large amounts of system memory.
However, the OS might not allow the elimination of
swap space. An OS set to run many kinds of different
servers spends much of its CPU cycle on other
operations, thus slowing down performance.
Reset to factory defaults
A manual reset switch is mounted on the board.
1 Insert a tool in the hole in the back panel to
activate the switch.
2 Wait until the Activity LED on the top of the unit
becomes green, then cycle power.
The unit is reset to factory defaults.