[lustre-discuss] how to set max_pages_per_rpc (I have done something wrong and need help)

Harald van Pee pee at hiskp.uni-bonn.de
Wed Nov 15 08:26:25 PST 2017


Here are more informations:

if I try to mount the filesystem on the client I get similar messages as from 
the failing conf_param command. It seems one have to remove this failed 
configuration but how?
Here the syslog output on the client:

kernel: [ 4203.506437] LustreError: 3698:0:
(obd_mount.c:1340:lustre_fill_super()) Unable to mount  (-2)
 kernel: [ 5028.547095] LustreError: 3830:0:
(obd_config.c:1202:class_process_config()) no device for: hiskp3-OST0000-osc-
ffff880416680800
 kernel: [ 5028.547105] LustreError: 3830:0:
(obd_config.c:1606:class_config_llog_handler()) MGC192.168.128.200 at o2ib: cfg 
command failed: rc = -22
 kernel: [ 5028.547112] Lustre:    cmd=cf00f 0:hiskp3-OST0000-osc  
1:osc.max_pages_per_rpc=256  
 kernel: [ 5028.547112] 
 kernel: [ 5028.547156] LustreError: 15b-f: MGC192.168.128.200 at o2ib: The 
configuration from log 'hiskp3-client'failed from the MGS (-22).  Make sure 
this client and the MGS are running compatible versions of Lustre.
 kernel: [ 5028.547407] LustreError: 1680:0:(lov_obd.c:946:lov_cleanup()) 
hiskp3-clilov-ffff880416680800: lov tgt 1 not cleaned! deathrow=0, lovrc=1
 kernel: [ 5028.547415] LustreError: 1680:0:(lov_obd.c:946:lov_cleanup()) 
Skipped 3 previous similar messages
 kernel: [ 5028.550906] Lustre: Unmounted hiskp3-client
 kernel: [ 5028.551407] LustreError: 3815:0:
(obd_mount.c:1340:lustre_fill_super()) Unable to mount  (-22)



On Wednesday 15 November 2017 16:06:29 Harald van Pee wrote:
> Dear all,
> 
> I want to set max_pages_per_rpc to 64 instead of 256
> lustre mgs/mdt version 2.53
> lustre oss version 2.53
> lustre client 2.6
> 
> on client I have done:
> lctl get_param osc.hiskp3-OST*.max_pages_per_rpc
> osc.hiskp3-OST0001-osc-ffff88105dba4800.max_pages_per_rpc=256
> osc.hiskp3-OST0002-osc-ffff88105dba4800.max_pages_per_rpc=256
> osc.hiskp3-OST0003-osc-ffff88105dba4800.max_pages_per_rpc=256
> osc.hiskp3-OST0004-osc-ffff88105dba4800.max_pages_per_rpc=256
> lctl set_param osc.hiskp3-OST*.max_pages_per_rpc=64
> 
> this works, but after remount I get again 256 therefore I want to make it
> permant with
>  lctl conf_param hiskp3-OST*.osc.max_pages_per_rpc=64
> 
> But I get the message, that this command have to be given on mdt
> unfortunately I go to our combined mgs/mdt and get
> 
> Lustre: Setting parameter hiskp3-OST0000-osc.osc.max_pages_per_rpc in log
> hiskp3-client
> LustreError: 956:0:(obd_config.c:1221:class_process_config()) no device
> for: hiskp3-OST0000-osc-MDT0000
> LustreError: 956:0:(obd_config.c:1591:class_config_llog_handler())
> MGC192.168.128.200 at o2ib: cfg command failed: rc = -22
> Lustre:    cmd=cf00f 0:hiskp3-OST0000-osc-MDT0000 
> 1:osc.max_pages_per_rpc=64
> 
> than I can not mount client and want to go back
> lctl set_param osc.hiskp3-OST*.max_pages_per_rpc=64
> 
> Lustre: Modifying parameter hiskp3-OST0000-osc.osc.max_pages_per_rpc in log
> hiskp3-client
> Lustre: Skipped 1 previous similar message
> LustreError: 966:0:(obd_config.c:1221:class_process_config()) no device
> for: hiskp3-OST0000-osc-MDT0000
> LustreError: 966:0:(obd_config.c:1591:class_config_llog_handler())
> MGC192.168.128.200 at o2ib: cfg command failed: rc = -22
> Lustre:    cmd=cf00f 0:hiskp3-OST0000-osc-MDT0000 
> 1:osc.max_pages_per_rpc=256
> 
> obviously what I have done was completly wrong and I can no longer mount a
> client, mounted clients are working.
> How can I get it back working?
> hiskp3-MDT0000 ist the label of the mgs/mdt but hiskp3-OST0000-osc-MDT0000
> seems to be incorrect
> 
> What I have to do to get the mgs/mdt working again?
> Its your production cluster
> Any help is welcome
> 
> Best
> Harald
> 
> 
> 
> 
> 
> 
> _______________________________________________
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> lustre-discuss at lists.lustre.org
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-- 
Harald van Pee

Helmholtz-Institut fuer Strahlen- und Kernphysik der Universitaet Bonn
Nussallee 14-16 - 53115 Bonn - Tel +49-228-732213 - Fax +49-228-732505
mail: pee at hiskp.uni-bonn.de


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