[systemd-devel] after=local-fs not enforced

[Benoit SCHMID]

Hello,

On 11/25/2016 04:47 AM, Andrei Borzenkov wrote:
> Yes, this is the command that tries to unmount filesystems on LVM2
> devices, thus bypassing systemd normal dependencies. The idea of such
> service is very questionable, but it is probably not something you can
> really change.
>
> You can try to add drop-in to order this service after
> systemd-logind.service on shutdown, but I would contact RH and verify
> that they agree to support this. In any case, this is not systemd issue.

A quick and dirty way of avoiding this is to add the following.
After=blk-availability.service in my service.

Do you see any drawbacks by setting this?

In most case, Linux admin should not see this umount problems
because busy fs are not unmounted.
On a SAP system running on Oracle you should always get the error.
Because the oraarch is not busy except when the DB archives a redolog.
Therefore blk-availability succeeds to umount oraarch because it is empty.
Then SAP forces the archive of the current redolog.
Then it needs to access this fs that has been unmounted:
###
Stopping background process SMCO
Thu Nov 24 14:51:59 2016
Errors in file
/oracle/XXX/saptrace/diag/rdbms/xxx/XXX/trace/XXX_arc2_12953.trc:
ORA-19504: failed to create file
"/oracle/XXX/oraarch/xxxarch1_530_927368778.dbf"
ORA-27040: file create error, unable to create file
Linux-x86_64 Error: 13: Permission denied
Additional information: 1
ARC2: Error 19504 Creating archive log file to
'/oracle/XXX/oraarch/XXXarch1_530_927368778.dbf'
###

Honestly, what is disappointing is that RH does not consider LVM fs as
local-fs.
Now that I understand the problem, I consider this not a systemd problem,
but rather a lvm systemd integration problem.
What is frustrating, is that I have been having a call opened, for that,
with RH, for more than two weeks.
The only answer I got is : We are working on it :-(
But this is neither a systemd problem :-)

Thanks in advance for your answer.

-- 
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     Benoit Schmid              Tel: (+41-22) 379-7209

     University of Geneva - Information Technology Division

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