IBM System Storage DS3500 Introduction And Implementation Manual page 629

Draft Document for Review March 28, 2011 12:24 pm
Download the latest multipath driver from the IBM support web site.
Read carefully the multipath driver README file to see which kernel version is supported
with that driver.
Install the necessary packages in the Linux Server to build the multipath driver:
– gcc-4.3-62.198
– kernel-source-2.6.27.19-5.1
– linux-kernel-headers-2.6.27-2.22
– make-3.81-128.20
– glibc-devel(64 bits) - only for 64 bits -
For the systems that have LSI Logic HBAs (like in this case), INITRD_MODULES should
include mptbase and mptscsi (or mptscsih) for pre-3.02.xx version of LSI mpt driver. The
INITRD_MODULES should include mptbase, mptscsi, mptspi, mptsas and mptfc for
3.02.xx or later version of LSI mpt driver.
Although the system can have Fibre Channel HBAs from multiple vendors or multiple
models of HBAs from the same vendor, only HBAs from same vendor can be connected to
each Storage Array.
Use udev by-id specification in /etc/fstab file. The ID paths are device specific and won't
change as a result of hardware changes. If you use specifications like /dev/sda for
partitions, after mapping the logical drive, /dev/sda could probably not be the same hard
disk. So, in this case the operating system will try to boot from the storage instead of
booting from the local hard disks resulting in an error.
An example of an fstab file using by-id specification is shown in Example 20-1
Example 20-1 Example of fstab using by-id specification
# cat /etc/fstab
/dev/disk/by-id/scsi-35000c500009c6dcb-part1 swap swap defaults 0 0
/dev/disk/by-id/scsi-35000c500009c6dcb-part2 / ext3 acl,user_xattr 1 1
/dev/disk/by-id/scsi-35000c50002ebe6bf-part1 /windows/C ntfs-3g
users,gid=users,fmask=133,dmask=022,locale=en_US.UTF-8 0 0
proc
sysfs
debugfs
usbfs
devpts
It is possible to modify the udev specification by running the following steps (only
applicable to SuSE):
a. Run the following command to configure hard disk definitions:
# yast disk
A similar window will appear as shown in Figure 20-2 on page 606
/proc proc
/sys sysfs
/sys/kernel/debug debugfs
/proc/bus/usb usbfs
/dev/pts devpts
Chapter 20. SuSE Linux configuration guide
Linux Config.fm
defaults
noauto
noauto
noauto
mode=0620,gid=5
0 0
0 0
0 0
0 0
0 0
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