Hi Neil,
This is hopefully the tail of the feature additions from me for
mdadm-3.0-final. It adds the capability for mdadm to detect platform
raid capabilities, and honor them when creating new arrays. For example
here is the output of the new --detail-platform option on an imsm
enabled platform:
# mdadm --detail-platform -e imsm
Platform : Intel(R) Matrix Storage Manager
Version : 7.6.0.1011
RAID Levels : raid0 raid1 raid10 raid5
Max Disks : 6
Max Volumes : 2
I/O Controller : /sys/devices/pci0000:00/0000:00:1f.2
Port0 : /dev/sda (5RA4GKSS)
Port1 : /dev/sdb (5RA4GKNC)
Port2 : /dev/sdc (5RA4GKT8)
Port3 : /dev/sdd (5RA4GQWR)
Port5 : /dev/sde (5RA4GQYG)
This implementation crawls through sysfs to put this information
together, I believe it is crawling in a future proof fashion, but here
are my assumptions:
1/ /sys/bus/pci/drivers/ahci/<x>/device will identify a pci ahci device
with a bus id of 'x'. This allows mdadm to detect which disks are
attached to which controller.
2/ The 'scsi_host' objects in /sys/bus/pci/drivers/ahci/<x> are named
'host%d' and there is one host per physical ahci port. This is not
critical but allows the 'Port' information to be displayed.
It relies on /sys/dev/block so requires at least 2.6.27.
Other notables:
1/ An attempt to cover the delay between mdadm creating an array and the
friendly-named device node showing up in /dev/md/ by calling 'udevadm
settle' before starting starting Incremental assembly. This
specifically fixes scripts that do:
mdadm -A /dev/md/<container>
mdadm -I /dev/md/<container>
There is a good chance there is a better place to put this call, but
putting it in create_mddev didn't work, and moving it up in main()
resulted in a hang. I didn't want to hold up the other patches for this
debug.
2/ --wait-clean now honors the --scan option to allow shutdown scripts
to generically wait for any external metadata devices to finish
lingering writes.
3/ Now that we can do checking against the platform there are cases
where ->add_to_super should fail.
Please have a look.
Thanks,
Dan
PS: consuming large amounts of turkey may slow my responses until
Monday :-)
The following changes since commit a30b2ecd4a4215b0c0017edc6df538c264a97e85:
NeilBrown (1):
Assemble: don't auto-assemble if any arrays are listed in mdadm.conf
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/djbw/mdadm.git devel
Dan Williams (10):
some warn_unused_result fixups
udevadm settle barrier before invoking incremental assembly
Support --wait-clean --scan
allow add_to_super to return errors
imsm: fix metadata reservation
imsm: detect option-rom capabilities
imsm: sysfs support routines for determining device connectivity
imsm: validate arrays being created against firmware capabilities
introduce --detail-platform to display platform raid capabilities
imsm: provide a detail_platform method
Create.c | 8 +-
Detail.c | 41 ++++++++
Makefile | 6 +-
Manage.c | 9 ++-
ReadMe.c | 2 +
mdadm.8 | 44 ++++++++--
mdadm.c | 28 +++++-
mdadm.h | 8 ++-
mdopen.c | 14 ++-
platform-intel.c | 268 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
platform-intel.h | 129 ++++++++++++++++++++++++++
super-ddf.c | 9 +-
super-intel.c | 236 ++++++++++++++++++++++++++++++++++++++++++++----
super0.c | 5 +-
super1.c | 5 +-
15 files changed, 765 insertions(+), 47 deletions(-)
create mode 100644 platform-intel.c
create mode 100644 platform-intel.h
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