[Lustre-discuss] Trying to mount lustre on a client when one or more OST is disabled

[Andreas Dilger]

The error message shows a timeout connecting to umt3-MDT0000 and not the OST.  The operation 38 is MDS_CONNECT, AFAIK. 

Cheers, Andreas

On 2010-12-14, at 9:19, Bob Ball <ball at umich.edu> wrote:

> I am trying to get a lustre client to mount the service, but with one or 
> more OST disabled.  This does not appear to be working.  Lustre version 
> is 1.8.4.
> 
>  mount -o localflock,exclude=umt3-OST0019 -t lustre 
> 10.10.1.140 at tcp0:/umt3 /lustre/umt3
> 
> dmesg on this client shows the following during the umount/mount sequence:
> 
> Lustre: client ffff810c25c03800 umount complete
> Lustre: Skipped 1 previous similar message
> Lustre: MGC10.10.1.140 at tcp: Reactivating import
> Lustre: 450250:0:(obd_mount.c:1786:lustre_check_exclusion()) Excluding 
> umt3-OST0019 (on exclusion list)
> Lustre: 450250:0:(obd_mount.c:1786:lustre_check_exclusion()) Skipped 1 
> previous similar message
> Lustre: 5942:0:(client.c:1476:ptlrpc_expire_one_request()) @@@ Request 
> x1354682302740498 sent from umt3-MDT0000-mdc-ffff810628209000 to NID 
> 10.10.1.49 at tcp 0s ago has failed due to network error (5s prior to 
> deadline).
>   req at ffff810620e66400 x1354682302740498/t0 
> o38->umt3-MDT0000_UUID at 10.10.1.49@tcp:12/10 lens 368/584 e 0 to 1 dl 
> 1292342239 ref 1 fl Rpc:N/0/0 rc 0/0
> Lustre: 5942:0:(client.c:1476:ptlrpc_expire_one_request()) Skipped 1 
> previous similar message
> Lustre: Client umt3-client has started
> 
> When I check following the mount, using "lctl dl", I see the following, 
> and it is clear that the OST is active as far as this client is concerned.
> 
>  19 UP osc umt3-OST0018-osc-ffff810628209000 
> 05b29472-d125-c36e-c023-e0eb76aaf353 5
>  20 UP osc umt3-OST0019-osc-ffff810628209000 
> 05b29472-d125-c36e-c023-e0eb76aaf353 5
>  21 UP osc umt3-OST001a-osc-ffff810628209000 
> 05b29472-d125-c36e-c023-e0eb76aaf353 5
> 
> Two questions here.  The first, obviously, is what is wrong with this 
> picture?  Why can't I exclude this OST from activity on this client?  Is 
> it because the OSS serving that OST still has the OST active?  If the 
> OST were deactivated or otherwise unavailable on the OSS, would the 
> client mount then succeed to exclude this OST?  (OK, more than one 
> question in the group....)
> 
> Second group, what is the correct syntax for excluding more that one 
> OST?  Is it a comma-separated list of exclusions, or are separate 
> excludes required?
> 
>  mount -o localflock,exclude=umt3-OST0019,umt3-OST0020 -t lustre 
> 10.10.1.140 at tcp0:/umt3/lustre/umt3
>                or
>  mount -o localflock,exclude=umt3-OST0019,exclude=umt3-OST0020 -t 
> lustre 10.10.1.140 at tcp0:/umt3 /lustre/umt3
> 
> Thanks,
> bob
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