[PVE-User] CPU soft lookup

Lars Wilke l.wilke at it-betrieb.de
Mon Feb 28 15:21:39 CET 2011

* Dietmar Maurer wrote:
> > No, raid10 is implemented at the controller level.
> > SAS1064ET PCI-Express Fusion-MPT SAS
> So why is there a "dm_raid45" module loaded?

Hm, this is indeed strange, these are the currently loaded dm Modules.
But there is no software raid at all.

These are the currently loaded modules
[root at be01 ~]# lsmod|grep dm
dm_multipath           56793  0
scsi_dh                42177  1 dm_multipath
dm_raid45              99657  0
dm_message             36289  1 dm_raid45
dm_region_hash         46145  1 dm_raid45
dm_mem_cache           38977  1 dm_raid45
dm_snapshot            52233  0
dm_zero                35265  0
dm_mirror              54737  0
dm_log                 44993  3 dm_raid45,dm_region_hash,dm_mirror
dm_mod                101521  19

[root at be01 ~]# pvs
  PV         VG         Fmt  Attr PSize   PFree
  /dev/hda2  VolGroup00 lvm2 a-    11.88G     0
  /dev/vda1  VolGroup01 lvm2 a-   100.00G  5.00G
  /dev/vdb1  data       lvm2 a-    40.00G 10.00G
  /dev/vdc1  data       lvm2 a-    40.00G 20.00G

[root at be01 ~]# cat /proc/mdstat
Personalities :
unused devices: <none>

mdadm is not even installed on the system.

I can unload the module without any problem.
I guess there is some magic in the boot process which loads the dm_raid45 module.
All the other VMs have this module loaded, too.

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