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Re: [dm-devel] RHEL5 and RDAC/Multipath



Could you try using in your default settings
 no_path_retry           queue



Regards
Sunil Joshi


On 9/24/07, Nuno Fernandes <npf-mlists eurotux com> wrote:
Hi,

We've bought and IBM BladecenterH and IBM DS4700 storage.
We are using Redhat Enterprise Linux 5 and we are trying to put multipath
working.

RHEL5 we are using uses 2.6.18-8.1.3.el5xen. We've ported rdac patch
(http://kernel.org/pub/linux/kernel/people/agk/patches/2.6/2.6.21/dm-mpath-rdac.patch)
to RHEL5 kernel. We've also updated multipath-tools to support
mpath_prio_rdac.

Our multipath.conf is:

devnode_blacklist {
  devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
  devnode "^hd[a-z]"
  devnode "^cciss!c[0-9]d[0-9]*"
  #USB 4G Flash drive inside HS21
  devnode "sda"
}

defaults {
  multipath_tool "/sbin/multipath -v0"
  udev_dir /dev
  polling_interval 5
  default_selector "round-robin 0"
  default_getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
  #default_prio_callout "/bin/true"
  failback immediate
  path_checker rdac
  hardware_handler "1 rdac"
  prio_callout "/sbin/mpath_prio_tpc /dev/%n"
  path_grouping_policy group_by_prio
}

multipaths {
  multipath {
  wwid 3600a0b8000320bea0000048f46e52137
  alias client_data
  }
}

When we start multipath -v2 it creates multipath devices. I can see 2 active
paths (active controler) and 2 ghost paths (standby controler).
When i unplug 2 active fibre that connect the fabric to DS4700, multipath
reports I/O errors and doesn't failover the controler.

Any ideas?

Thanks for any help
Nuno Fernandes

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