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Supported Kdump Targets
This document try to list all supported kdump targets, and those supported
or unknown/tech-preview targets, this can help users to decide whether a dump
solution is available.
Dump Target support status
==========================
This section tries to come up with some kind of guidelines in terms of
what dump targets are supported/not supported. Whatever is listed here
is not binding in any manner. It is just sharing of current understanding
and if something is not right, this section needs to be edited.
Following are 3 lists. First one contains supported targets. These are
generic configurations which should work and some configuration most
likely has worked in testing. Second list is known unsupported targets.
These targets we know either don't work or we don't support. And third
list is unknown/tech-preview. We either don't yet know the status of kdump
on these targets or these are under tech-preview.
Note, these lists are not set in stone and can be changed at any point of
time. Also these lists might not be complete. We will add/remove items to
it as we get more testing information. Also, there are many corner cases
which can't possibly be listed. For example in general we might be
supporting software iscsi but there might be some configurations of it
which don't work.
So if any target is listed in supported section, it does not mean it works
in all possible configurations. It just means that in common configurations
it should work but there can be issues with particular configurations which
are not supported. As we come to know of particular issues, we will keep on
updating lists accordingly.
Supported Dump targets
----------------------
storage:
LVM volume
Thin provisioning volume
FC disks (qla2xxx, lpfc, bnx2fc, bfa)
software initiator based iSCSI
software RAID (mdraid)
hardware RAID (cciss, hpsa, megaraid_sas, mpt2sas, aacraid)
SCSI/SATA disks
iSCSI HBA (all offload)
hardware FCoE (qla2xxx, lpfc)
software FCoE (bnx2fc) (Extra configuration required,
please read "Note on FCoE" section below)
network:
Hardware using kernel modules: (tg3, igb, ixgbe, sfc, e1000e, bna,
cnic, netxen_nic, qlge, bnx2x, bnx, qlcnic, be2net, enic,
virtio-net, ixgbevf, igbvf)
protocol: ipv4
bonding
vlan
bridge
team
vlan tagged bonding
bridge over bond/team/vlan
hypervisor:
kvm
xen (Supported in select configurations only)
filesystem:
ext[234]
xfs
nfs
firmware:
BIOS
UEFI
hypervisor:
VMWare ESXi 4.1 and 5.1
Hyper-V 2012 R2 (RHEL Gen1 UP Guest only)
Unsupported Dump targets
------------------------
storage:
BIOS RAID
Software iSCSI with iBFT (bnx2i, cxgb3i, cxgb4i)
Software iSCSI with hybrid (be2iscsi)
FCoE
legacy IDE
glusterfs
gfs2/clvm/halvm
network:
hardware using kernel modules: (sfc SRIOV, cxgb4vf, pch_gbe)
protocol: ipv6
wireless
Infiniband (IB)
vlan over bridge/team
filesystem:
btrfs
Unknown/tech-preview
--------------------
storage:
PCI Express based SSDs
hypervisor:
Hyper-V 2008
Hyper-V 2012
Note on FCoE
=====================
If you are trying to dump to a software FCoE target, you may encounter OOM
issue, because some software FCoE requires more memory to work. In such case,
you may need to increase the kdump reserved memory size in "crashkernel="
kernel parameter.
By default, RHEL systems have "crashkernel=auto" in kernel boot arguments.
The auto reserved memory size is designed to balance the coverage of use cases
and an acceptable memory overhead, so not every use case could fit in, software
FCoE is one of the case.
For hardware FCoE, kdump should work naturally as firmware will do the
initialization job. The capture kernel and kdump tools will run just fine.
Useful Links
============
[1] RHEL6: Enabling kdump for full-virt (HVM) Xen DomU
(https://access.redhat.com/knowledge/solutions/92943)