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Cheyenne
n00b
Joined: 05 Jan 2005
Posts: 33
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 Posted: Wed Mar 18, 2015 9:04 pm Post subject: [RESOLVED] Problem with multipath |
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I'm running into a problem with a new system upgrade (both hardware and OS system level) and multipath.
Multipath is not creating the device maps for any of the devices that are on my SAN. I can "see" the individual devices (output of lsscsi). And running multipath with the -v6 option (yes it goes above 3), shows that multipath is finding the devices, however it's erroring out with the following output
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Mar 18 14:33:49 | libdevmapper: ioctl/libdm-iface.c(1773): device-mapper: reload ioctl on mpatha failed: Invalid argument
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(error message in context)
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....
Mar 18 14:33:49 | mpatha: assembled map [1 queue_if_no_path 0 2 1 service-time 0 1 1 8:96 1 service-time 0 1 1 8:32 1]
Mar 18 14:33:49 | mpatha: set ACT_CREATE (map does not exist)
Mar 18 14:33:49 | libdevmapper: ioctl/libdm-iface.c(1755): dm info mpatha NF [16384] (*1)
Mar 18 14:33:49 | mpatha: addmap [0 62914560 multipath 1 queue_if_no_path 0 2 1 service-time 0 1 1 8:96 1 service-time 0 1 1 8:32 1]
Mar 18 14:33:49 | libdevmapper: libdm-common.c(2196): Udev cookie 0xd4d345f (semid 65536) incremented to 2
Mar 18 14:33:49 | libdevmapper: libdm-common.c(2446): Udev cookie 0xd4d345f (semid 65536) assigned to CREATE task(0) with flags (0x0)
Mar 18 14:33:49 | libdevmapper: ioctl/libdm-iface.c(1755): dm create mpatha mpath-36005076802818f4178000000000000b2 OF [16384] (*1)
Mar 18 14:33:49 | libdevmapper: ioctl/libdm-iface.c(1755): dm reload mpatha OF [16384] (*1)
Mar 18 14:33:49 | libdevmapper: ioctl/libdm-iface.c(1773): device-mapper: reload ioctl on mpatha failed: Invalid argument
Mar 18 14:33:49 | libdevmapper: ioctl/libdm-iface.c(1362): <backtrace>
Mar 18 14:33:49 | libdevmapper: libdm-common.c(2231): Udev cookie 0xd4d345f (semid 65536) decremented to 1
Mar 18 14:33:49 | libdevmapper: libdm-common.c(2196): Udev cookie 0xd4d345f (semid 65536) incremented to 2
Mar 18 14:33:49 | libdevmapper: libdm-common.c(2446): Udev cookie 0xd4d345f (semid 65536) assigned to REMOVE task(2) with flags (0x0)
Mar 18 14:33:49 | libdevmapper: ioctl/libdm-iface.c(1755): dm remove mpatha NF [16384] (*1)
Mar 18 14:33:49 | libdevmapper: libdm-common.c(1396): mpatha: Stacking NODE_DEL [verify_udev]
Mar 18 14:33:49 | libdevmapper: ioctl/libdm-iface.c(1755): dm info mpatha NF [16384] (*1)
Mar 18 14:33:49 | mpatha: domap (0) failure for create/reload map
Mar 18 14:33:49 | mpatha: ignoring map
Mar 18 14:33:49 | mpatha: remove multipath map
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In the messages file I have the following from there kernel:
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Mar 18 14:33:49 penguint kernel: device-mapper: table: table load rejected: including non-request-stackable devices
Mar 18 14:33:49 penguint kernel: device-mapper: table: unable to set table type
Mar 18 14:33:49 penguint kernel: device-mapper: table: table load rejected: including non-request-stackable devices
Mar 18 14:33:49 penguint kernel: device-mapper: table: unable to set table type
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I'm experienced with setting up multipath devices.
specifics:
IBM X3850
QLogic HBA's
IBM V7000 SAN
McData Fiber switch.
gentoo-sources-3.18.7
multipath-tools-0.5.0-r1
lvm2-2.02.109
The problem also happens when booting off a fairly current gentoo admin-cd.
My current running system cannot boot on the new hardware due to some other device driver level issues.
Last edited by Cheyenne on Thu Mar 19, 2015 1:21 pm; edited 1 time in total |
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Cheyenne
n00b
Joined: 05 Jan 2005
Posts: 33
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| Posted: Wed Mar 18, 2015 9:57 pm Post subject: |
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Further info..
The problem seems to be within the kernel itself.
I dropped back to gentoo-sources-3.10.17 (with no other changes) and multipath is working again |
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Cheyenne
n00b
Joined: 05 Jan 2005
Posts: 33
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| Posted: Thu Mar 19, 2015 1:23 pm Post subject: |
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| Turned out that SCSI_MQ_DEFAULT was set to Y and BLK_MQ doesn't currently support multipath. Setting the value to N corrected the problem. |
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thegeezer
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Joined: 11 Jul 2010
Posts: 38
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| Posted: Thu Nov 01, 2018 2:38 pm Post subject: |
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| Cheyenne wrote: | | Turned out that SCSI_MQ_DEFAULT was set to Y and BLK_MQ doesn't currently support multipath. Setting the value to N corrected the problem. |
thanks for this, turns out in 2018 blk_mq still doesn't support multipath
easy fix is to add to dm_mod.use_blk_mq=0 kernel command line, quick test using kexec
| Code: | # kexec -l kernel-genkernel-x86_64-4.14.65-gentoo --append="root=/dev/sda4 dm_mod.use_blk_mq=0" --initrd=initramfs-genkernel-x86_64-4.14.65-gentoo
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