[lustre-discuss] lustre client not able to lctl ping or mount

[Richard Henwood]

On Tue, 2018-09-04 at 08:06 -0700, Pak Lui wrote:
> Hi all,
>
> I am having issue with the Lustre client pinging the server using
> o2ib.I want to find out if anyone has a suggestion on what could be
> the problem. Thanks in advance.
>
> lustre client pinging to server:
> > [root at n0 ~]# lctl ping 192.168.13.8 at o2ib
> > failed to ping 192.168.13.8 at o2ib: Input/output error <<<<<<<
>
> lustre client pinging to server over IPoIB works:
> > [root at n0~]# ping -c 1 192.168.13.8
> > PING 192.168.13.8 (192.168.13.8) 56(84) bytes of data.
> > 64 bytes from 192.168.13.8: icmp_seq=1 ttl=64 time=0.376 ms
>
> lustre client pinging to self or other client works:
> > [root at n0 ~]# lctl ping 192.168.13.54 at o2ib
> > 12345-0 at lo
> > 12345-192.168.13.54 at o2ib
>
> lustre client pinging to self or otover IPoIB works:
> > [root at n0~]# ping -c 1 192.168.13.54
> > PING 192.168.13.54 (192.168.13.54) 56(84) bytes of data.
> > 64 bytes from 192.168.13.54: icmp_seq=1 ttl=64 time=0.017 ms
>
> The lustre server and client have specified the modprobe for lnet:
> > /etc/modprobe.conf
> > options lnet networks=o2ib(ib0)
>
> The client reports some error when trying to ping or mount from the
> client to server:
> modprobe lustre lnet
> lctl ping 192.168.13.8 at o2ib
> mount -v -t lustre 192.168.13.8 at o2ib:/zfs /mnt/zfs
>
> > [root at n0 ~]# dmesg|tail
> > [589805.093447] Lustre: Lustre: Build Version: 2.11.54
> > [589805.272652] LNet: Using FastReg for registration
> > [589805.275954] LNet: Added LNI 192.168.13.54 at o2ib [8/256/0/180]
> > [589813.278370] LNet:
> > 22357:0:(o2iblnd_cb.c:3320:kiblnd_check_conns()) Timed out tx for 1
> > 92.168.13.186 at o2ib: 589813 seconds
> > [589835.518404] LustreError:
> > 22463:0:(mgc_request.c:251:do_config_log_add()) MGC192.168.13.8 at o2i
> > b: failed processing log, type 1: rc = -5
> > [589843.118385] LustreError:
> > 22488:0:(mgc_request.c:601:do_requeue()) failed processing log: -5
> > [589866.718389] LustreError: 15c-8: MGC192.168.13.8 at o2ib: The
> > configuration from log 'zfs-client' failed (-5). This may be the
> > result of communication errors between this node and the MGS, a bad
> > configuration, or other errors. See the syslog for more
> > information.
> > [589866.741623] Lustre: Unmounted zfs-client
> > [589867.278516] LustreError:
> > 22463:0:(obd_mount.c:1599:lustre_fill_super()) Unable to mount  (-
> > 5)
>
> server reports some error during mounting:
> > [root at license ~]# Sep  4 07:26:56 license kernel: LNet:
> > 25518:0:(o2iblnd_cb.c:2475:kiblnd_passive_connect()) Can't accept
> > conn from 192.168.13.54 at o2ib (version 12): max_frags 16
> > incompatible without FMR pool (256 wanted)
>
> The lustre server setup:
> > [root at license ~]# lfs df -h
> > UUID                       bytes        Used   Available Use%
> > Mounted on
> > zfs-MDT0000_UUID          863.4M        7.5M      853.9M   1%
> > /mnt/zfs[MDT:0]
> > zfs-OST0000_UUID            1.7T       10.0G        1.7T   1%
> > /mnt/zfs[OST:0]
> >
> > filesystem_summary:         1.7T       10.0G        1.7T   1%
> > /mnt/zfs
>
> server: RHEL 7.5 (3.10.0-862.el7.x86_64), MLNX_OFED_LINUX-4.4-
> 2.0.7.0, lustre 2.11.54
> client: RHEL 7.5 (4.14.0-49.el7a.aarch64), MLNX_OFED_LINUX-4.4-
> 2.0.7.0 , lustre 2.11.54
>


It might be helpful to state the Lustre software versions that you have
used.

Also, given this is an Arm client with (with presumably 64K pg size),
connecting to a x86 server (with presumably 4K pg size), have you added
the map_on_demand=16 incantation to the server? I don't have direct
experience of this, but heard it was needed in some Arm configurations
(depending on server/client version):

https://jira.whamcloud.com/browse/LU-10775

May be James can advise?

best regards,
Richard

--
Richard.Henwood at arm.com
Server Software Eco-System
Tel: +1 512 410 9612
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