Problem with Multipath FC and Ethernus DX200S4

[nextit]

Hi,

we have a cluster with 3 nodes that the storage is based on Ethernus DX200S4 connected via FC.

The SAN have 2 controller that are connected to each nodes via 2 link.

The multipath view the LUN on the storage, but when we connect alla the cable one path flap on each node concurrently.

multipath -ll

3600000e00d2c0000002c1b2000000000 dm-2 FUJITSU,ETERNUS_DXL
size=26T features='1 queue_if_no_path' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| `- 1:0:0:0 sdb 8:16 active ready running
`-+- policy='service-time 0' prio=10 status=enabled
|- 1:0:1:0 sdc 8:32 active ready running
`- 2:0:1:0 sdd 8:48 active ready running

/var/log/messages

May 11 17:50:16 pve03-fi kernel: [1745898.894241] sd 2:0:0:0: Attached scsi generic sg4 type 0
May 11 17:50:16 pve03-fi kernel: [1745898.905579] sd 2:0:0:0: alua: transition timeout set to 60 seconds
May 11 17:50:16 pve03-fi kernel: [1745898.905585] sd 2:0:0:0: alua: port group 8080 state A preferred supports toluSNA
May 11 17:50:16 pve03-fi kernel: [1745898.995235] sd 2:0:0:0: Power-on or device reset occurred
May 11 17:50:22 pve03-fi kernel: [1745904.941800] sd 2:0:0:0: [sde] 55029268480 512-byte logical blocks: (28.2 TB/25.6 TiB)
May 11 17:50:22 pve03-fi kernel: [1745904.941813] sd 2:0:0:0: [sde] 4096-byte physical blocks
May 11 17:50:22 pve03-fi kernel: [1745905.045139] sd 2:0:0:0: Power-on or device reset occurred
May 11 17:50:22 pve03-fi kernel: [1745905.045219] sd 2:0:0:0: [sde] Write Protect is off
May 11 17:50:22 pve03-fi kernel: [1745905.045343] sd 2:0:0:0: [sde] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
May 11 17:50:22 pve03-fi kernel: [1745905.047626] sd 2:0:0:0: [sde] Attached SCSI disk
May 11 17:50:23 pve03-fi kernel: [1745905.561638] sd 1:0:0:0: alua: port group 8081 state A preferred supports toluSNA
May 11 17:50:23 pve03-fi kernel: [1745905.561654] sd 2:0:0:0: alua: port group 8080 state A preferred supports toluSNA
May 11 17:50:23 pve03-fi kernel: [1745905.561723] sd 1:0:0:0: alua: port group 8081 state A preferred supports toluSNA
May 11 17:50:23 pve03-fi kernel: [1745905.561738] sd 2:0:0:0: alua: port group 8080 state A preferred supports toluSNA
May 11 17:50:33 pve03-fi kernel: [1745915.229870] sd 2:0:0:0: Power-on or device reset occurred
May 11 17:50:49 pve03-fi kernel: [1745932.144922] sd 2:0:0:0: Power-on or device reset occurred
May 11 17:51:12 pve03-fi kernel: [1745954.511377] sd 2:0:0:0: Power-on or device reset occurred
May 11 17:51:22 pve03-fi kernel: [1745964.732790] sd 2:0:0:0: Power-on or device reset occurred
May 11 17:51:30 pve03-fi kernel: [1745972.435144] sd 2:0:0:0: Power-on or device reset occurred
May 11 17:51:36 pve03-fi kernel: [1745978.644466] sd 2:0:0:0: Power-on or device reset occurred
May 11 17:51:49 pve03-fi kernel: [1745991.444330] sd 2:0:0:0: Power-on or device reset occurred
May 11 17:51:56 pve03-fi kernel: [1745999.042402] device-mapper: multipath: Failing path 8:64.
May 11 17:52:42 pve03-fi kernel: [1746045.097180] sd 2:0:0:0: [sde] Synchronizing SCSI cache
May 11 17:52:42 pve03-fi kernel: [1746045.097208] sd 2:0:0:0: [sde] Synchronize Cache(10) failed: Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
May 11 17:52:42 pve03-fi kernel: [1746045.178017] scsi 2:0:0:0: alua: Detached
May 11 17:52:43 pve03-fi kernel: [1746045.209730] sd 1:0:0:0: alua: port group 8081 state A preferred supports toluSNA
May 11 17:52:43 pve03-fi kernel: [1746045.209806] sd 1:0:0:0: alua: port group 8081 state A preferred supports toluSNA

Does some one have the same problem or a solution with this product?

Thanks in advance.

Best regards

 

[LnxBil]

Why haven't you configured ALUA? The flapping would stop and you would have access to both paths in a round robin fashion.

 

[nextit]

Why haven't you configured ALUA? The flapping would stop and you would have access to both paths in a round robin fashion.

Hi,
we haven't configured nothing because the default configs of multipath.

Do you have any example that you can post us to see the correct configuration?

 

[LnxBil]

Do you have any example that you can post us to see the correct configuration?

It is configured on the SAN side, you need to change to host response in "Volume" -> "Performance (HOST I/O)":



I also recommend using Wide Stripe Volumes.

In general, it's best to ask the company who sold the SAN to you.