Le 3 sept. 2018 à 18:31, Nir Soffer <nsoffer@redhat.com> a écrit :

On Mon, Sep 3, 2018 at 5:07 PM Fabrice Bacchella <fabrice.bacchella@orange.fr> wrote:
In the release notes, I see:

• BZ 1622700 [downstream clone - 4.2.6] [RFE][Dalton] - Blacklist all local disk in multipath on RHEL / RHEV Host (RHEL 7.5)
Feature:
Blacklist local devices in multipath.

Reason:
multipath repeatedly logs irrelevant errors for local devices.

Result:
Local devices are blacklisted, and no irrelevant errors are logged anymore.

What defines a local disk ? I'm using a SAN on SAS. For many peoples, SAS is only for local disks, but that's not the case. Will other 4.2.6 will detect that ?

We don't have any support for SAS.

If you SAS drives are attached to the host using FC or iSCSI, you are fine.

Nope, they are attached using SAS.

In /dev/disk, they show as:

ls -l /dev/disk/by-*/*:16
lrwxrwxrwx 1 root root  9 Sep  3 18:01 /dev/disk/by-path/pci-0000:87:00.0-scsi-0:2:1:16 -> ../../sdc
lrwxrwxrwx 1 root root  9 Sep  3 18:01 /dev/disk/by-path/pci-0000:87:00.0-scsi-0:2:2:16 -> ../../sds
lrwxrwxrwx 1 root root 10 Sep  3 18:01 /dev/disk/by-path/pci-0000:87:00.0-scsi-0:2:3:16 -> ../../sdai
lrwxrwxrwx 1 root root 10 Sep  3 18:01 /dev/disk/by-path/pci-0000:87:00.0-scsi-0:2:4:16 -> ../../sdaz
lrwxrwxrwx 1 root root 10 Sep  3 18:01 /dev/disk/by-path/pci-0000:87:00.0-scsi-0:2:5:16 -> ../../sdbq
lrwxrwxrwx 1 root root 10 Sep  3 18:01 /dev/disk/by-path/pci-0000:87:00.0-scsi-0:2:6:16 -> ../../sdar
lrwxrwxrwx 1 root root 10 Sep  3 18:01 /dev/disk/by-path/pci-0000:87:00.0-scsi-0:2:7:16 -> ../../sdch
lrwxrwxrwx 1 root root 10 Sep  3 18:01 /dev/disk/by-path/pci-0000:87:00.0-scsi-0:2:8:16 -> ../../sdcv

ls -l /dev/disk/by-* | grep sdcv
lrwxrwxrwx 1 root root 10 Sep  3 18:01 scsi-3600c0ff0002631c42168f15601000000 -> ../../sdcv
lrwxrwxrwx 1 root root 10 Sep  3 18:01 wwn-0x600c0ff0002631c42168f15601000000 -> ../../sdcv
lrwxrwxrwx 1 root root 10 Sep  3 18:01 pci-0000:87:00.0-scsi-0:2:8:16 -> ../../sdcv




If your drives are connected in another way, you probably need to edit 
/etc/multipath.conf.

The current setting is:

blacklist_exceptions {
        protocol "(scsi:fcp|scsi:iscsi)"                                                                                                                                                      
}


Where do I find the protocol multipath thinks the drives are using ?