Create a ddf array by naming the device /dev/ddf* or specifying metadata 'ddf'. If ddf is specified with no level, assume a container (indeed, anything else would be wrong). **Need to use text_Version to set external metadata... More ddf support Load a ddf container. Now --examine /dev/ddf works. super-ddf: fix compile warning From: Dan Williams <dan.j.williams@intel.com> super-ddf.c:723: format %lu expects type long unsigned int, but argument 3 has type unsigned int Signed-off-by: Dan Williams <dan.j.williams@intel.com>
214 lines
7.0 KiB
Plaintext
214 lines
7.0 KiB
Plaintext
- add 'name' field to metadata type and use it.
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- use validate_geometry more
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- metadata should be able to check/reject bitmap stuff.
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DDF:
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Three new metadata types:
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ddf - used only to create a container.
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ddf-bvd - used to create an array in a container
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ddf-svd - used to create a secondary array from bvds.
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Usage:
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mdadm -C /dev/ddf1 /dev/sd[abcdef]
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mdadm -C /dev/md1 -e ddf /dev/sd[a-f]
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mdadm -C /dev/md1 -l container /dev/sd[a-f]
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Each of these create a new ddf container using all those
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devices. The name 'ddf*' signals that ddf metadata should be used.
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'-e ddf' only supports one level - 'container'. 'container' is only
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supported by ddf.
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mdadm -C /dev/md1 -l0 -n4 /dev/ddf1 # or maybe not ???
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mdadm -C /dev/md1 -l1 -n2 /dev/sda /dev/sdb
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If exactly one device is given, and it is a container, we select
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devices from that container.
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If devices are given that are already in use, they must be in use by
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a container, and the array is created in the container.
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If devices given are bvds, we slip under the hood to make
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the svd arrays.
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mdadm -A /dev/ddf ......
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base drives make a container. Anything in that container is started
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auto-read-only.
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if /dev/ddf is already assembled, we assemble bvds and svds inside it.
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2005-dec-20
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Want an incremental assembly mode to work nicely with udev.
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Core usage would be something like
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mdadm --incr-assemble /dev/newdevice
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This would
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- examine the device to determine uuid etc.
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- look for a match in /etc/mdadm.conf, abort if not found
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- find that device and collect current contents
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- perform an 'assemble' analysis to make sure we have the best set of devices.
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- remove or add devices as appropriate
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- possibly start the array if it was complete
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Other usages could involve
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- specify which array to auto-add to.
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This requires an existing array for uuid matching... is there any point?
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-
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2004-june-02
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* Don't print 'errors' flag, it is meaningless. DONE
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* Handle new superblock format
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* create device file on demand, particularly partitionable devices. DONE
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BUT figure a way to create the partition devices.
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auto=partN
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* Use Event: interface to listen for events. DONE, untested
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* Make sure mdadm -As can assemble multi-level RAIDs ok.
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* --build to build raid1 or multipath arrays
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clean or not ???
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----------------------------------------------------------------------------
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* mdadm --monitor to monitor failed multipath paths and re-instate them.
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* Maybe make "--help" fit in 80x24 and have a --long-help with more info. DONE
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* maybe "missing" instead of <bold>missing</> in doco DONE
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* possibly wait for resync to start, or even finish while assembling.- NO
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* -Db should have a devices= entry if possible. - DONE
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* when assembling multipath arrays, ignore any error indicators. - DONE
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* rationalise --monitor usage:
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mdadm --monitor
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doesn't do as expected. DONE
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* --assemble could have a --update option. - DONE
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following word can be:
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sparc2.2
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super-minor
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* mdadm /dev/md11, where md11 is raid0 can segfault, particularly when looking in the
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[UU_UUU] string ... which doesn't exist !
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It should be more sensible. DONE
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Example:
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from Raimund Sacherer <raimund.sacherer@ngit.at>
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mke2fs -m0 -q /dev/ram1 300
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mount -n -t ext2 /dev/ram1 /tmp
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echo DEVICE /dev/[sh]* >> /tmp/mdadm.conf
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mdadm -Esb /dev/[sh]* 2>/dev/null >> /tmp/mdadm.conf
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mdadm -ARsc /tmp/mdadm.conf
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umount /tmp
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?? Allow -S /dev/md? - current complains subsequent not a/d/r - DONE
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* new "Query" mode to subsume --detail and --examine.
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--query or -Q, takes a device and tells if it is an MD device,
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and also tells in a raid superblock is found.
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DONE
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* write mdstat.c to parse /proc/mdstat file
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Build list of arrays: name, rebuild-percent
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DONE
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* parse /proc/partitions and map major/minor into /dev/* names,
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and use that for default DEVICE list ????
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* --detail --scan to read /proc/mdstat, and then iterate over these,
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but assume --brief. --verbose can override
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check each subdevice to see if it is in conf_get_devs.
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Warn if not.
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DONE, but don't warn yet...
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* Support multipath ... maybe...
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maybe DONE
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* --follow to syslog
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* --follow to move spares around DONE
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* --follow to notice other events: DONE
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rebuild started
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spare activated
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spare removed
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spare added
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------------------------------------
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- --examine --scan scans all drives and build an mdadm.conf file DONE
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- check superblock checksum in examine DONE
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- report "chunk" or "rounding" depending on raid level DONE
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- report "linear" instead of "-1" for raid level DONE
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- decode ayout depending on raid level DONE
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- --verbose and --force flags. DONE
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- set md_minor, *_disks for Create - DONE
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- for create raid5, how to choose between
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all working, but not insync
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one missing, one spare, insync DONE (--force)
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- and for raid1 - some failed drives... (missing)
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- when RUN_ARRAY, make sure *_disks counts are right
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- get --detail to extract extra stuff from superblock,
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like uuid DONE
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- --detail --brief to give a config file line DONE
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- parse config file. DONE
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- test...
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- when --assemble --scan, if an underlying device is an md device,
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then try to assemble that device first.
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- mdadm -S /dev/md0 /dev/md1 gives internal error FIXED
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- mdadm --detail --scan print summary of what it can find? DONE
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---------
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Assemble doesn't add spares. - DONE
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Create to allow "missing" name for devices.
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Create to accept "--force" for do exactly what is requested
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- get Assemble to upgrade devices if force flag.
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ARRAY lines in config file to have super_minor=n
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ARRAY lines in config file to have device=pattern, and only accept
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those devices
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If UUID given, insist on that
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If not, but super_minor given, require all found with that minor
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to have same uuid
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If only device given, all valid supers on those devices must have
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same uuid
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allow /dev/mdX as first argument before any options
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Possible --dry-run option for create and assemble--force
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Assemble to check that all devices mentioned in superblock
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are present.
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New mode: --Monitor (or --Follow)
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Periodically check status of all arrays (listed in config file).
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Log every event and apparent cause - or differences
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Email and alert - or run a program - for important events
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Move spares around if necessary.
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An Array line can have a spare-group= field that indicates that
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the array shares spares with other arrays with the same
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spare-group name.
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If an array has a failed and no spares, then check all other
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arrays in the spare group. If one has no failures and a spare,
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then consider that spare.
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Choose the smallest considered spare that is large enough.
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If there is one, then hot-remove it from it's home, and
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hot-add it to the array in question.
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--mail-to address
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--alert-handler program
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Will also extract information from /proc/mdstat if present,
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and consider 20% marks in rebuild as events.
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Events are:
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drive fails - causes mail to be sent
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rebuild started
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spare activated
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spare removed
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spare added
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