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+ - add 'name' field to metadata type and use it.
+ - use validate_geometry more
+ - metadata should be able to check/reject bitmap stuff.
+ Three new metadata types:
+ ddf - used only to create a container.
+ ddf-bvd - used to create an array in a container
+ ddf-svd - used to create a secondary array from bvds.
+ mdadm -C /dev/ddf1 /dev/sd[abcdef]
+ mdadm -C /dev/md1 -e ddf /dev/sd[a-f]
+ mdadm -C /dev/md1 -l container /dev/sd[a-f]
+ Each of these create a new ddf container using all those
+ devices. The name 'ddf*' signals that ddf metadata should be used.
+ '-e ddf' only supports one level - 'container'. 'container' is only
+ supported by ddf.
+ mdadm -C /dev/md1 -l0 -n4 /dev/ddf1 # or maybe not ???
+ mdadm -C /dev/md1 -l1 -n2 /dev/sda /dev/sdb
+ If exactly one device is given, and it is a container, we select
+ devices from that container.
+ If devices are given that are already in use, they must be in use by
+ a container, and the array is created in the container.
+ If devices given are bvds, we slip under the hood to make
+ the svd arrays.
+ mdadm -A /dev/ddf ......
+ base drives make a container. Anything in that container is started
+ if /dev/ddf is already assembled, we assemble bvds and svds inside it.
+ Want an incremental assembly mode to work nicely with udev.
+ Core usage would be something like
+ mdadm --incr-assemble /dev/newdevice
+ This would
+ - examine the device to determine uuid etc.
+ - look for a match in /etc/mdadm.conf, abort if not found
+ - find that device and collect current contents
+ - perform an 'assemble' analysis to make sure we have the best set of devices.
+ - remove or add devices as appropriate
+ - possibly start the array if it was complete
+ Other usages could involve
+ - specify which array to auto-add to.
+ This requires an existing array for uuid matching... is there any point?
+ * Don't print 'errors' flag, it is meaningless. DONE
+ * Handle new superblock format
+ * create device file on demand, particularly partitionable devices. DONE
+ BUT figure a way to create the partition devices.
+ * Use Event: interface to listen for events. DONE, untested
+ * Make sure mdadm -As can assemble multi-level RAIDs ok.
+ * --build to build raid1 or multipath arrays
+ clean or not ???
+* mdadm --monitor to monitor failed multipath paths and re-instate them.
+* Maybe make "--help" fit in 80x24 and have a --long-help with more info. DONE
+* maybe "missing" instead of <bold>missing</> in doco DONE
+* possibly wait for resync to start, or even finish while assembling.- NO
+* -Db should have a devices= entry if possible. - DONE
+* when assembling multipath arrays, ignore any error indicators. - DONE
+* rationalise --monitor usage:
+ mdadm --monitor
+ doesn't do as expected. DONE
+* --assemble could have a --update option. - DONE
+ following word can be:
+* mdadm /dev/md11, where md11 is raid0 can segfault, particularly when looking in the
+ [UU_UUU] string ... which doesn't exist !
+It should be more sensible. DONE
+from Raimund Sacherer <email@example.com>
+mke2fs -m0 -q /dev/ram1 300
+mount -n -t ext2 /dev/ram1 /tmp
+echo DEVICE /dev/[sh]* >> /tmp/mdadm.conf
+mdadm -Esb /dev/[sh]* 2>/dev/null >> /tmp/mdadm.conf
+mdadm -ARsc /tmp/mdadm.conf
+?? Allow -S /dev/md? - current complains subsequent not a/d/r - DONE
+* new "Query" mode to subsume --detail and --examine.
+ --query or -Q, takes a device and tells if it is an MD device,
+ and also tells in a raid superblock is found.
+* write mdstat.c to parse /proc/mdstat file
+ Build list of arrays: name, rebuild-percent
+* parse /proc/partitions and map major/minor into /dev/* names,
+ and use that for default DEVICE list ????
+* --detail --scan to read /proc/mdstat, and then iterate over these,
+ but assume --brief. --verbose can override
+ check each subdevice to see if it is in conf_get_devs.
+ Warn if not.
+ DONE, but don't warn yet...
+* Support multipath ... maybe...
+ maybe DONE
+* --follow to syslog
+* --follow to move spares around DONE
+* --follow to notice other events: DONE
+ rebuild started
+ spare activated
+ spare removed
+ spare added
+- --examine --scan scans all drives and build an mdadm.conf file DONE
+- check superblock checksum in examine DONE
+- report "chunk" or "rounding" depending on raid level DONE
+- report "linear" instead of "-1" for raid level DONE
+- decode ayout depending on raid level DONE
+- --verbose and --force flags. DONE
+- set md_minor, *_disks for Create - DONE
+- for create raid5, how to choose between
+ all working, but not insync
+ one missing, one spare, insync DONE (--force)
+- and for raid1 - some failed drives... (missing)
+- when RUN_ARRAY, make sure *_disks counts are right
+- get --detail to extract extra stuff from superblock,
+ like uuid DONE
+- --detail --brief to give a config file line DONE
+- parse config file. DONE
+- when --assemble --scan, if an underlying device is an md device,
+ then try to assemble that device first.
+- mdadm -S /dev/md0 /dev/md1 gives internal error FIXED
+- mdadm --detail --scan print summary of what it can find? DONE
+Assemble doesn't add spares. - DONE
+Create to allow "missing" name for devices.
+Create to accept "--force" for do exactly what is requested
+- get Assemble to upgrade devices if force flag.
+ARRAY lines in config file to have super_minor=n
+ARRAY lines in config file to have device=pattern, and only accept
+ those devices
+ If UUID given, insist on that
+ If not, but super_minor given, require all found with that minor
+ to have same uuid
+ If only device given, all valid supers on those devices must have
+ same uuid
+allow /dev/mdX as first argument before any options
+Possible --dry-run option for create and assemble--force
+Assemble to check that all devices mentioned in superblock
+ are present.
+New mode: --Monitor (or --Follow)
+ Periodically check status of all arrays (listed in config file).
+ Log every event and apparent cause - or differences
+ Email and alert - or run a program - for important events
+ Move spares around if necessary.
+ An Array line can have a spare-group= field that indicates that
+ the array shares spares with other arrays with the same
+ spare-group name.
+ If an array has a failed and no spares, then check all other
+ arrays in the spare group. If one has no failures and a spare,
+ then consider that spare.
+ Choose the smallest considered spare that is large enough.
+ If there is one, then hot-remove it from it's home, and
+ hot-add it to the array in question.
+ --mail-to address
+ --alert-handler program
+ Will also extract information from /proc/mdstat if present,
+ and consider 20% marks in rebuild as events.
+ Events are:
+ drive fails - causes mail to be sent
+ rebuild started
+ spare activated
+ spare removed
+ spare added