[lustre-discuss] OST is not mounting

[Backer]

Hi,

I am new to this email list. Looking to get some help on why an OST is not
getting mounted.


The cluster was running healthy and the OST experienced an issue and Linux
re-mounted the OST read only. After fixing the issue and rebooting the node
multiple times, it wouldn't mount.

When the mount is done, the mount command errors out stating that that the
index is already in use. The index for the device is 33.  There is no place
where this index is mounted.

The debug message from the MGS during the mount is attached at the end of
this email. It is asking to use writeconf. After using writeconfig, the
device was mounted. Looking for a couple of things here.

- I am hoping that the writeconf method is the right thing to do here.
- Why did OST become in this state after the write failure and was mounted
RO.  The write error was due to iSCSI target going offline and coming back
after a few seconds later.

20000000:01000000:17.0:1698240468.758487:0:91492:0:(mgs_handler.c:496:mgs_target_reg())
updating fs1-OST0021, index=33

20000000:00000001:17.0:1698240468.758488:0:91492:0:(mgs_llog.c:4403:mgs_write_log_target())
Process entered

20000000:00000001:17.0:1698240468.758488:0:91492:0:(mgs_llog.c:671:mgs_set_index())
Process entered

20000000:00000001:17.0:1698240468.758488:0:91492:0:(mgs_llog.c:572:mgs_find_or_make_fsdb())
Process entered

20000000:00000001:17.0:1698240468.758489:0:91492:0:(mgs_llog.c:551:mgs_find_or_make_fsdb_nolock())
Process entered

20000000:00000001:17.0:1698240468.758489:0:91492:0:(mgs_llog.c:565:mgs_find_or_make_fsdb_nolock())
Process leaving (rc=0 : 0 : 0)

20000000:00000001:17.0:1698240468.758489:0:91492:0:(mgs_llog.c:578:mgs_find_or_make_fsdb())
Process leaving (rc=0 : 0 : 0)

20000000:02020000:17.0:1698240468.758490:0:91492:0:(mgs_llog.c:711:mgs_set_index())
140-5: Server fs1-OST0021 requested index 33, but that index is already in
use. Use --writeconf to force

20000000:00000001:17.0:1698240468.772355:0:91492:0:(mgs_llog.c:712:mgs_set_index())
Process leaving via out_up (rc=18446744073709551518 : -98 :
0xffffffffffffff9e)

20000000:00000001:17.0:1698240468.772356:0:91492:0:(mgs_llog.c:4408:mgs_write_log_target())
Process leaving (rc=18446744073709551518 : -98 : ffffffffffffff9e)

20000000:00020000:17.0:1698240468.772357:0:91492:0:(mgs_handler.c:503:mgs_target_reg())
Failed to write fs1-OST0021 log (-98)

20000000:00000001:17.0:1698240468.783747:0:91492:0:(mgs_handler.c:504:mgs_target_reg())
Process leaving via out (rc=18446744073709551518 : -98 : 0xffffffffffffff9e)
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