[Linux-cluster] Clustered VGs with many PVs slow to activate

[Janne Peltonen]

There seems to be great variation in the cycle time in different SAN
load conditions:

On Fri, Jun 29, 2007 at 10:21:42AM +0300, Janne Peltonen wrote:
> [jmmpelto at pcn1 ~]$ time sudo service clvmd restart
> Deactivating VG mappi-primary:   0 logical volume(s) in volume group "mappi-primary" now active
>                                                            [  OK  ]
> Stopping clvm:                                             [  OK  ]
> Starting clvmd:                                            [  OK  ]
> Activating VGs:   2 logical volume(s) in volume group "main" now active
>   78 logical volume(s) in volume group "mappi-primary" now active
>                                                            [  OK  ]
> 
> real    4m40.448s
> user    0m0.662s
> sys     0m0.299s

(added and reduced 10 PV's) (and the activity on the SAN on other nodes
decreased)

[jmmpelto at pcn1 ~]$ time sudo service clvmd restart
Deactivating VG mappi-primary:   0 logical volume(s) in volume group "mappi-primary" now active
                                                           [  OK  ]
Stopping clvm:                                             [  OK  ]
Starting clvmd:                                            [  OK  ]
Activating VGs:   2 logical volume(s) in volume group "main" now active
  78 logical volume(s) in volume group "mappi-primary" now active
                                                           [  OK  ]

real    1m54.891s
user    0m0.672s
sys     0m0.324s
[jmmpelto at pcn1 ~]$ time sudo service clvmd restart
Password:
Deactivating VG mappi-primary:   0 logical volume(s) in volume group "mappi-primary" now active
                                                           [  OK  ]
Stopping clvm:                                             [  OK  ]
Starting clvmd:                                            [  OK  ]
Activating VGs:   2 logical volume(s) in volume group "main" now active
  78 logical volume(s) in volume group "mappi-primary" now active
                                                           [  OK  ]

real    2m3.736s
user    0m0.660s
sys     0m0.321s


--Janne
-- 
Janne Peltonen <janne.peltonen at helsinki.fi>