On Thu, 2016-06-30 at 14:08 -0700, Ming Lin wrote:
> Hi Mike,
>
> I'm trying to test NVMeoF multi-path.
>
> root@host:~# lsmod |grep dm_multipath
> dm_multipath 24576 0
> root@host:~# ps aux |grep multipath
> root 13183 0.0 0.1 238452 4972 ? SLl 13:41 0:00
> /sbin/multipathd
>
> I have nvme0 and nvme1 that are 2 paths to the same NVMe subsystem.
>
> root@host:/sys/class/nvme# grep . nvme*/address
> nvme0/address:traddr=192.168.3.2,trsvcid=1023
> nvme1/address:traddr=192.168.2.2,trsvcid=1023
>
> root@host:/sys/class/nvme# grep . nvme*/subsysnqn
> nvme0/subsysnqn:nqn.testiqn
> nvme1/subsysnqn:nqn.testiqn
>
> root@host:~# /lib/udev/scsi_id --export --whitelisted -d /dev/nvme1n1
> ID_SCSI=1
> ID_VENDOR=NVMe
> ID_VENDOR_ENC=NVMe\x20\x20\x20\x20
> ID_MODEL=Linux
> ID_MODEL_ENC=Linux
> ID_REVISION=0-rc
> ID_TYPE=disk
> ID_SERIAL=SNVMe_Linux
> ID_SERIAL_SHORT=
> ID_SCSI_SERIAL=1122334455667788
>
> root@host:~# /lib/udev/scsi_id --export --whitelisted -d /dev/nvme0n1
> ID_SCSI=1
> ID_VENDOR=NVMe
> ID_VENDOR_ENC=NVMe\x20\x20\x20\x20
> ID_MODEL=Linux
> ID_MODEL_ENC=Linux
> ID_REVISION=0-rc
> ID_TYPE=disk
> ID_SERIAL=SNVMe_Linux
> ID_SERIAL_SHORT=
> ID_SCSI_SERIAL=1122334455667788
>
> But seems multipathd didn't recognize these 2 devices.
>
> What else I'm missing?
There are two problems:
1. there is no "/block/" in the path
/sys/devices/virtual/nvme-fabrics/block/nvme0/nvme0n1
2. nvme was blacklisted.
I added below quick hack to just make it work.
root@host:~# cat /proc/partitions
259 0 937692504 nvme0n1
252 0 937692504 dm-0
259 1 937692504 nvme1n1
diff --git a/libmultipath/blacklist.c b/libmultipath/blacklist.c
index 2400eda..a143383 100644
--- a/libmultipath/blacklist.c
+++ b/libmultipath/blacklist.c
@@ -190,9 +190,11 @@ setup_default_blist (struct config * conf)
if (store_ble(conf->blist_devnode, str, ORIGIN_DEFAULT))
return 1;
+#if 0
str = STRDUP("^nvme.*");
if (!str)
return 1;
+#endif
if (store_ble(conf->blist_devnode, str, ORIGIN_DEFAULT))
return 1;
diff --git a/multipathd/main.c b/multipathd/main.c
index c0ca571..1364070 100644
--- a/multipathd/main.c
+++ b/multipathd/main.c
@@ -1012,6 +1012,7 @@ uxsock_trigger (char * str, char ** reply, int * len, void * trigger_data)
static int
uev_discard(char * devpath)
{
+#if 0
char *tmp;
char a[11], b[11];
@@ -1028,6 +1029,7 @@ uev_discard(char * devpath)
condlog(4, "discard event on %s", devpath);
return 1;
}
+#endif
return 0;
}
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