Intel SRCU31, User Manual

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58 Intel RAID SRCU31 Users Guide
GDT Driver Parameters
Reservation of SCSI Devices
The reservation of SCSI devices becomes necessary if you want Direct Access Devices (for
example, hard disk drives, removable hard disk drives like IOMEGA
†
or SyQuest
†
,
some MOs) to
be directly controlled by Linux and not the Intel RAID Controller SRCU31’s firmware (for
example, they are not configured as host drives).
Reservation of SCSI devices is also called raw-service. In this case, the Intel RAID Controller
SRCU31 does not cache the data to/from the reserved SCSI device. This reservation is important
for removable hard disk drives. If they are controlled by the Intel RAID Controller SRCU31 and
are a host drive, a media change is very difficult.
Non Direct Access Devices like CD-ROMs, Streamers, DATs, etc. do NOT require a reservation.
CAUTION
The reservation of SCSI devices is only possible with not-initialized SCSI devices. (Use StorCon to
de-initialize an already initialized device.)
From driver version 1.10 on you can add the parameters for the reservation with the LILO append
command:
Excerpt of “/etc/lilo.conf:”
# End LILO global section
# Linux bootable partition config begins
image = /boot/vmlinuz
root = /dev/sda2
label = Linux
append = “gdth=reserve_list:1,0,6,0”
# Linux bootable partition config ends
This “gdth” driver parameter reserves the SCSI device that is connected with Intel RAID Controller
SRCU31 1 (the second Intel RAID Controller SRCU31), SCSI Bus 0 (channel A), ID 6, LUN 0 for
Linux (raw service).
After each change
in “/etc/lilo.conf”
LILO must be loaded once.
Driver parameters may also be entered at the LILO boot prompt, (for example:
gdth=reserve_list:1,0,6,0).