Ignoring Local Disks when Generating Multipath Devices on Oracle Linux 6 (文件 ID 1601802.1)

In this Document

Goal

Solution

Applies to:

Linux OS - Version Oracle Linux 5.5 with Unbreakable Enterprise Kernel [2.6.32] and later
Linux x86-64
Linux x86

Goal

This document should show how to blacklist local disks from multipath configurations.

Determine local disks

# multipath -v2
create: SATA_WDC_WD800JD-75M_WD-WMAM9S391055 undef ATA,WDC WD800JD-75MS
size=75 GB features="0" hwhandler="0" wp=undef
`-+- policy='round-robin 0' prio=1 status=undef
|- 0:0:0:0 sda 8:0

.
.
.

or use

# multipathd show paths format "%n %S %s %f %h %t"
size vend/prod/rev          dm_st
75G ATA,WDC WD800JD-75MS   undef
10G DGC,RAID 5             active
10G DGC,RAID 5             active
50G DGC,RAID 5             active
50G DGC,RAID 5             active
10G DGC,RAID 5             active
10G DGC,RAID 5             active
50G DGC,RAID 5             active
50G DGC,RAID 5             active
10G SUN,Sun Storage 7410   active
10G SUN,Sun Storage 7410   active
100G SUN,Sun Storage 7410   active
100G SUN,Sun Storage 7410   active

"ATA" here tells you that this is a local disk

For more information on multipathd use, please read DM Multipath Configuration and Administration
Now blacklist the device found above in the /etc/multipath.conf

blacklist {
wwid SATA_WDC_WD800JD-75M_WD-WMAM9S391055
}
reload the multipath configuration

# service multipathd reload
remove the existing map

# multipath -f SATA_WDC_WD800JD-75M_WD-WMAM9S391055
Confirm that the device is not added back by multipathd

# multipath | grep SATA_WDC_WD800JD-75M_WD-WMAM9S391055

this should return nothing.