Here is my config:
root@os-node1:~# uname -a
Linux os-node1 3.16.0-48-generic #64~14.04.1-Ubuntu SMP Thu Aug 20
23:03:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
root@os-node1:~# cat /etc/mdadm/mdadm.conf
DEVICE /dev/mapper/hgst-ssd*
CREATE owner=root group=disk mode=0660 auto=yes
HOMEHOST <system>
MAILADDR root
ARRAY /dev/md0 metadata=0.90 UUID=4472a74f:ca206897:3b82bcad:daeae9f9
root@os-node1:~# cat /etc/multipath.conf
blacklist {
wwid 3600508b1001cbb0c5b5a2fe0a85e0053
wwid 3600508b1001c33e8fe607dfd73043d03
wwid 32020030102060804
}
multipaths {
multipath {
wwid 35000cca04f1cbdfc
alias hgst-ssd1
path_grouping_policy multibus
path_selector "round-robin 0"
failback 2
rr_weight uniform
no_path_retry 0
rr_min_io 1000
}
multipath {
wwid 35000cca04f1cc050
alias hgst-ssd2
path_grouping_policy multibus
path_selector "round-robin 0"
failback 2
rr_weight uniform
no_path_retry 0
rr_min_io 1000
}
multipath {
wwid 35000cca04f1ce930
alias hgst-ssd3
path_grouping_policy multibus
path_selector "round-robin 0"
failback 2
rr_weight uniform
no_path_retry 0
rr_min_io 1000
}
multipath {
wwid 35000cca04f1ce1f4
alias hgst-ssd4
path_grouping_policy multibus
path_selector "round-robin 0"
failback 2
rr_weight uniform
no_path_retry 0
rr_min_io 1000
}
multipath {
wwid 35000cca04f1cbe18
alias hgst-ssd5
path_grouping_policy multibus
path_selector "round-robin 0"
failback 2
rr_weight uniform
no_path_retry 0
rr_min_io 1000
}
multipath {
wwid 35000cca04f1cdc58
alias hgst-ssd6
path_grouping_policy multibus
path_selector "round-robin 0"
failback 2
rr_weight uniform
no_path_retry 0
rr_min_io 1000
with this config I do:
root@os-node1:~# update-initramfs -u
update-initramfs: Generating /boot/initrd.img-3.16.0-48-generic
Then I reboot the computer but the mdadm raid doesn't start up. The
multipathed devides does start up:
root@os-node1:~# multipath -ll
Error: : Inappropriate ioctl for device
cciss TUR failed in CCISS_GETLUNINFO: Inappropriate ioctl for device
Error: : Inappropriate ioctl for device
cciss TUR failed in CCISS_GETLUNINFO: Inappropriate ioctl for device
hgst-ssd6 (35000cca04f1cdc58) dm-5 HGST ,HUSMM1680ASS200
size=745G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
|- 3:0:2:0 sde 8:64 active ready running
`- 4:0:2:0 sdk 8:160 active ready running
hgst-ssd5 (35000cca04f1cbe18) dm-7 HGST ,HUSMM1680ASS200
size=745G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
|- 3:0:4:0 sdg 8:96 active ready running
`- 4:0:4:0 sdm 8:192 active ready running
hgst-ssd4 (35000cca04f1ce1f4) dm-3 HGST ,HUSMM1680ASS200
size=745G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
|- 3:0:0:0 sdc 8:32 active ready running
`- 4:0:0:0 sdi 8:128 active ready running
hgst-ssd3 (35000cca04f1ce930) dm-4 HGST ,HUSMM1680ASS200
size=745G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
|- 3:0:1:0 sdd 8:48 active ready running
`- 4:0:1:0 sdj 8:144 active ready running
hgst-ssd2 (35000cca04f1cc050) dm-8 HGST ,HUSMM1680ASS200
size=745G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
|- 3:0:5:0 sdh 8:112 active ready running
`- 4:0:5:0 sdn 8:208 active ready running
hgst-ssd1 (35000cca04f1cbdfc) dm-6 HGST ,HUSMM1680ASS200
size=745G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
|- 3:0:3:0 sdf 8:80 active ready running
`- 4:0:3:0 sdl 8:176 active ready running
Regards,
Remek
On Fri, Dec 11, 2015 at 3:04 PM, Phil Turmel <philip@xxxxxxxxxx> wrote:
> On 12/10/2015 05:44 PM, P. Remek wrote:
>>>
>>> Order of device discovery is not guaranteed, but base devices will
>>> almost always show up before multipath devices. You have to filter out
>>> the base devices from mdadm consideration:
>>>
>>> Add a DEVICES statement to your mdadm.conf that only matches your
>>> multipath device names, not the base names. Then update your initramfs
>>> so it applies to early boot as well.
>>>
>>
>>
>> This is something which I actually already tried. I specified in my
>> /etc/mdadm/mdadm.conf following:
>>
>> DEVICE /dev/mapper/hgst-ssd*
>>
>> In my /etc/multipath.conf I instruct dm-multipath to create
>> /dev/mapper/hgst-ssd1 /dev/mapper/hgst-ssd2 /dev/mapper/hgst-ssd3
>
> You haven't said that you've updated your initramfs with this info.
>
>> But the only result is that after this config, the md raid is not
>> started at all. My conclusion was that when md raid was starting, the
>> multipath devices did not yet exist so it did not start up the array.
>
> That would be an initramfs bug, most likely. Modern initramfs like
> dracut use incremental assembly to start arrays and subsystems as
> devices are started, regardless what order they show up.
>
> Phil
>
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