On Mon, 2009-08-24 at 23:53 +0200, Jakov Sosic wrote:
> On Mon, 24 Aug 2009 14:41:56 -0700
> Chandra Seetharaman <sekharan@xxxxxxxxxx> wrote:
>
> > These messages are seen because there is no support for this device
> > in-built in the scsi_dh_rdac module.
> >
> > These will disappear when youadded the device support to scsi_dh_rdac
> > module and include the module in your initrd image.
>
> Now if I understand correctly - because my device is not
> supported by scsi_dh_rdac - RDAC is not functional at all? Because
If your device was in the list, then you wouldn't seen multiples of
those error messages and would have seen the following message at boot
time itself.
> later in the dmesg, it shows
>
> sd 1:0:1:0: rdac: LUN 0 (owned)
> sd 1:0:0:0: rdac: LUN 0 (unowned)
scsi_dh_rdac modules is insmodded by multipath when multipathd is
started (by virtue of you having hardware_handler "1 rdac" in
your /etc/muliutpath.conf file.
So, it is effective when multipath starts.
>
> which suggests that RDAC is working after all?
>
>
>
>
>
> Here is my current multipath.conf (Sbeaf_11 and Sbeaf_21 are iSCSI
> targets that work flawlessly):
>
> defaults {
> user_friendly_names yes
> }
> defaults {
> udev_dir /dev
> polling_interval 10
> selector "round-robin 0"
> path_grouping_policy multibus
> getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
> prio_callout /bin/true
> path_checker readsector0
> rr_min_io 100
> max_fds 8192
> rr_weight priorities
> failback immediate
> no_path_retry fail
> user_friendly_names yes
> }
> blacklist {
> devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
> devnode "^hd[a-z]"
> }
> multipaths {
> multipath {
> wwid S_beaf11
> alias controller0
> path_grouping_policy failover
> path_checker readsector0
> path_selector "round-robin 0"
> failback immediate
> no_path_retry queue
> }
> multipath {
> wwid S_beaf21
> alias controller1
> path_grouping_policy failover
> path_checker readsector0
> path_selector "round-robin 0"
> failback immediate
> no_path_retry queue
> }
> multipath {
> wwid
> 3600a0b80002fcd18000014544a9166fb
> alias sas-xen
> }
> multipath {
> wwid
> 3600a0b80003abc5c00000b654a916617
> alias sas-mysql
> }
> multipath {
> wwid
> 3600a0b80002fcd18000014514a9165b4
> alias qd
> }
> }
>
>
> devices {
> device {
> vendor "SUN"
> product "LCSM100_S"
> getuid_callout "/sbin/scsi_id -g -u
> -s /block/%n"
> prio_callout "/sbin/mpath_prio_tpc /dev/%n"
> hardware_handler "1 rdac"
> path_grouping_policy group_by_prio
> path_checker rdac
> failback immediate
> rr_weight uniform
> no_path_retry queue
> rr_min_io 1000
> }
> }
>
>
>
>
> And here is the multipath -ll:
>
> # multipath -ll
> qd (3600a0b80002fcd18000014514a9165b4) dm-0 SUN,LCSM100_S
> [size=100M][features=1 queue_if_no_path][hwhandler=1 rdac][rw]
> \_ round-robin 0 [prio=3][active]
> \_ 1:0:1:0 sde 8:64 [active][ready]
> \_ round-robin 0 [prio=0][enabled]
> \_ 1:0:0:0 sdb 8:16 [active][ghost]
> controller1 (S_beaf21) dm-4 IET,VIRTUAL-DISK
> [size=3.4T][features=1 queue_if_no_path][hwhandler=0][rw]
> \_ round-robin 0 [prio=0][active]
> \_ 8:0:0:1 sdk 8:160 [active][ready]
> \_ round-robin 0 [prio=0][enabled]
> \_ 9:0:0:1 sdj 8:144 [active][ready]
> controller0 (S_beaf11) dm-3 IET,VIRTUAL-DISK
> [size=3.4T][features=1 queue_if_no_path][hwhandler=0][rw]
> \_ round-robin 0 [prio=0][active]
> \_ 10:0:0:1 sdh 8:112 [active][ready]
> \_ round-robin 0 [prio=0][enabled]
> \_ 11:0:0:1 sdi 8:128 [active][ready]
> sas-mysql (3600a0b80003abc5c00000b654a916617) dm-1 SUN,LCSM100_S
> [size=115G][features=1 queue_if_no_path][hwhandler=1 rdac][rw]
> \_ round-robin 0 [prio=3][active]
> \_ 1:0:1:1 sdf 8:80 [active][ready]
> \_ round-robin 0 [prio=0][enabled]
> \_ 1:0:0:1 sdc 8:32 [active][ghost]
> sas-xen (3600a0b80002fcd18000014544a9166fb) dm-2 SUN,LCSM100_S
> [size=21G][features=1 queue_if_no_path][hwhandler=1 rdac][rw]
> \_ round-robin 0 [prio=3][active]
> \_ 1:0:0:2 sdd 8:48 [active][ready]
> \_ round-robin 0 [prio=0][enabled]
> \_ 1:0:1:2 sdg 8:96 [active][ghost]
>
>
>
>
>
>
>
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