[PVE-User] Multipath with fiber channel

[Dmitry Petuhov]

That should be safe. In newer vanilla kernel this warning is just 
removed. See https://patchwork.kernel.org/patch/10079903/


12.01.2018 22:30, Jorge Visentini пишет:
> Hi everyone!
>
> Sorry my english.
>
> I'm having problem with multipath.
>
> When I use a considerable IO, the following messages appear:
>
> Jan 12 16:05:02 pve02 kernel: multipath_clone_and_map: 21 callbacks
> suppressed
> Jan 12 16:05:02 pve02 kernel: device-mapper: multipath: blk_get_request()
> returned -12 - requeuing
> Jan 12 16:05:02 pve02 kernel: device-mapper: multipath: blk_get_request()
> returned -12 - requeuing
> Jan 12 16:05:02 pve02 kernel: device-mapper: multipath: blk_get_request()
> returned -12 - requeuing
> Jan 12 16:05:02 pve02 kernel: device-mapper: multipath: blk_get_request()
> returned -12 - requeuing
> Jan 12 16:05:02 pve02 kernel: device-mapper: multipath: blk_get_request()
> returned -12 - requeuing
> Jan 12 16:05:02 pve02 kernel: device-mapper: multipath: blk_get_request()
> returned -12 - requeuing
> Jan 12 16:05:02 pve02 kernel: device-mapper: multipath: blk_get_request()
> returned -12 - requeuing
> Jan 12 16:05:02 pve02 kernel: device-mapper: multipath: blk_get_request()
> returned -12 - requeuing
> Jan 12 16:05:02 pve02 kernel: device-mapper: multipath: blk_get_request()
> returned -12 - requeuing
> Jan 12 16:05:02 pve02 kernel: device-mapper: multipath: blk_get_request()
> returned -12 - requeuing
> Jan 12 16:05:07 pve02 kernel: multipath_clone_and_map: 7309 callbacks
> suppressed
> Jan 12 16:05:07 pve02 kernel: device-mapper: multipath: blk_get_request()
> returned -12 - requeuing
> Jan 12 16:05:07 pve02 kernel: device-mapper: multipath: blk_get_request()
> returned -12 - requeuing
> Jan 12 16:05:07 pve02 kernel: device-mapper: multipath: blk_get_request()
> returned -12 - requeuing
> Jan 12 16:05:07 pve02 kernel: device-mapper: multipath: blk_get_request()
> returned -12 - requeuing
> Jan 12 16:05:07 pve02 kernel: device-mapper: multipath: blk_get_request()
> returned -12 - requeuing
>
>
>
> I already changed the multipath configuration, and it still did not work.
> Has anyone ever had this problem?
>
> My multipath configuration:
>
> root at pve02:~# cat /etc/multipath.conf
> devices {
>          device {
>                  vendor "IFT"
>                  path_grouping_policy group_by_prio
>                  getuid_callout "/lib/udev/scsi_id --whitelisted
> --device=/dev/%n"
>                  path_checker readsector0
>                  path_selector "round-robin 0"
>                  hardware_handler "0"
>                  failback 15
>                  rr_weight uniform
>                  no_path_retry 12
>                  prio alua
>          }
> }
>
> blacklist {
>          device {
>                  vendor "LSI"
>          }
> }
>
>
> I am using version 5.1-41 of the PVE configured with Infortrend Storage via
> Fiber Channel.
>
> Thank you for all!
>