[lustre-discuss] network error on bulk WRITE/bad log

Mon Aug 15 01:34:58 PDT 2022

Hi all,

In May I had a failure on a small cluster and asked here (http://lists.lustre.org/pipermail/lustre-discuss-lustre.org/2022-May/018073.html). Due to time constraints I just recreated the filesystem back then.

Now the failure happened again, this time I have more time and can investigate and haven't done anything destructive yet.

I use the following versions:

  *   lustre 2.14.56
  *   zfs 2.0.7 (previously used 2.1.2, but got told that 2.1.x is not tested well with lustre)
  *   Nodes are running Rocky Linux 8.6
  *   uname -r: 4.18.0-372.19.1.el8_6.aarch64

There are 2 IO nodes (io01 and io02), both of them are MDS and OSS and one of them is MGS. Here are the devices:

[snassyr at io02 ~]$ sudo lctl dl
  0 UP osd-zfs storage-MDT0001-osd storage-MDT0001-osd_UUID 8
  1 UP mgc MGC10.31.7.61 at o2ib a087e05e-d57c-4561-ad75-6827d4428f54 4
  2 UP mds MDS MDS_uuid 2
  3 UP lod storage-MDT0001-mdtlov storage-MDT0001-mdtlov_UUID 3
  4 UP mdt storage-MDT0001 storage-MDT0001_UUID 8
  5 UP mdd storage-MDD0001 storage-MDD0001_UUID 3
  6 UP osp storage-MDT0000-osp-MDT0001 storage-MDT0001-mdtlov_UUID 4
  7 UP osp storage-OST0000-osc-MDT0001 storage-MDT0001-mdtlov_UUID 4
  8 UP osp storage-OST0001-osc-MDT0001 storage-MDT0001-mdtlov_UUID 4
  9 UP lwp storage-MDT0000-lwp-MDT0001 storage-MDT0000-lwp-MDT0001_UUID 4
 10 UP osd-zfs storage-OST0001-osd storage-OST0001-osd_UUID 4
 11 UP ost OSS OSS_uuid 2
 12 UP obdfilter storage-OST0001 storage-OST0001_UUID 6
 13 UP lwp storage-MDT0000-lwp-OST0001 storage-MDT0000-lwp-OST0001_UUID 4
 14 UP lwp storage-MDT0001-lwp-OST0001 storage-MDT0001-lwp-OST0001_UUID 4

[snassyr at io01 ~]$ sudo lctl dl
  0 UP osd-zfs MGS-osd MGS-osd_UUID 4
  1 UP mgs MGS MGS 6
  2 UP mgc MGC10.31.7.61 at o2ib 9f351a51-0232-4306-a66d-cecee8629329 4
  3 UP osd-zfs storage-MDT0000-osd storage-MDT0000-osd_UUID 9
  4 UP mds MDS MDS_uuid 2
  5 UP lod storage-MDT0000-mdtlov storage-MDT0000-mdtlov_UUID 3
  6 UP mdt storage-MDT0000 storage-MDT0000_UUID 12
  7 UP mdd storage-MDD0000 storage-MDD0000_UUID 3
  8 UP qmt storage-QMT0000 storage-QMT0000_UUID 3
  9 UP osp storage-MDT0001-osp-MDT0000 storage-MDT0000-mdtlov_UUID 4
 10 UP osp storage-OST0000-osc-MDT0000 storage-MDT0000-mdtlov_UUID 4
 11 UP osp storage-OST0001-osc-MDT0000 storage-MDT0000-mdtlov_UUID 4
 12 UP lwp storage-MDT0000-lwp-MDT0000 storage-MDT0000-lwp-MDT0000_UUID 4
 13 UP osd-zfs storage-OST0000-osd storage-OST0000-osd_UUID 4
 14 UP ost OSS OSS_uuid 2
 15 UP obdfilter storage-OST0000 storage-OST0000_UUID 6
 16 UP lwp storage-MDT0000-lwp-OST0000 storage-MDT0000-lwp-OST0000_UUID 4
 17 UP lwp storage-MDT0001-lwp-OST0000 storage-MDT0001-lwp-OST0000_UUID 4

On io01 I see repeating errors mentioning a network error:

[65922.582578] LustreError: 20017:0:(ldlm_lib.c:3540:target_bulk_io()) Skipped 11 previous similar messages
[66494.575431] LNetError: 20017:0:(o2iblnd.c:1880:kiblnd_fmr_pool_map()) Failed to map mr 1/8 elements
[66494.575442] LNetError: 20017:0:(o2iblnd.c:1880:kiblnd_fmr_pool_map()) Skipped 11 previous similar messages
[66494.575446] LNetError: 20017:0:(o2iblnd_cb.c:613:kiblnd_fmr_map_tx()) Can't map 32768 bytes (8/8)s: -22
[66494.575448] LNetError: 20017:0:(o2iblnd_cb.c:613:kiblnd_fmr_map_tx()) Skipped 11 previous similar messages
[66494.575452] LNetError: 20017:0:(o2iblnd_cb.c:1725:kiblnd_send()) Can't setup PUT src for 10.31.7.62 at o2ib: -22
[66494.575454] LNetError: 20017:0:(o2iblnd_cb.c:1725:kiblnd_send()) Skipped 11 previous similar messages
[66494.575458] LustreError: 20017:0:(events.c:477:server_bulk_callback()) event type 5, status -5, desc 00000000cdd4e797
[66494.575460] LustreError: 20017:0:(events.c:477:server_bulk_callback()) Skipped 11 previous similar messages
[66546.574314] LustreError: 20017:0:(ldlm_lib.c:3540:target_bulk_io()) @@@ network error on bulk WRITE  req at 0000000070b8f1ab x1740960836990720/t0(0) o1000->storage-MDT0001-mdtlov_UUID at 10.31.7.62@o2ib:522/0<mailto:storage-MDT0001-mdtlov_UUID at 10.31.7.62@o2ib:522/0> lens 336/33016 e 0 to 0 dl 1660376137 ref 1 fl Interpret:/0/0 rc 0/0 job:''

On io02 I see repeating errors mentioning a bad log:

[66582.856444] LustreError: 14905:0:(llog_osd.c:264:llog_osd_read_header()) storage-MDT0000-osp-MDT0001: bad log  [0x200000401:0x1:0x0] header magic: 0x0 (expected 0x10645539)
[66582.856450] LustreError: 14905:0:(llog_osd.c:264:llog_osd_read_header()) Skipped 11 previous similar messages

I can't make sense of these error messages. How can I recover?

(I have the full dmesg/lctl dk log, but they are too big to attach, is it ok to upload them somewhere and put a link in a reply?)

Thank you and best regards,
Stepan

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