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Commit | Line | Data |
---|---|---|
838acbc2 NB |
1 | 2005-dec-20 |
2 | Want an incremental assembly mode to work nicely with udev. | |
3 | Core usage would be something like | |
4 | mdadm --incr-assemble /dev/newdevice | |
5 | This would | |
6 | - examine the device to determine uuid etc. | |
7 | - look for a match in /etc/mdadm.conf, abort if not found | |
8 | - find that device and collect current contents | |
9 | - perform an 'assemble' analysis to make sure we have the best set of devices. | |
10 | - remove or add devices as appropriate | |
11 | - possibly start the array if it was complete | |
12 | ||
13 | Other usages could involve | |
14 | - specify which array to auto-add to. | |
15 | This requires an existing array for uuid matching... is there any point? | |
16 | ||
17 | - | |
18 | ||
19 | ||
dd0781e5 NB |
20 | 2004-june-02 |
21 | * Don't print 'errors' flag, it is meaningless. DONE | |
22 | * Handle new superblock format | |
23 | * create device file on demand, particularly partitionable devices. DONE | |
24 | BUT figure a way to create the partition devices. | |
25 | auto=partN | |
26 | * Use Event: interface to listen for events. DONE, untested | |
27 | * Make sure mdadm -As can assemble multi-level RAIDs ok. | |
28 | * --build to build raid1 or multipath arrays | |
29 | clean or not ??? | |
30 | ||
31 | ---------------------------------------------------------------------------- | |
aa88f531 NB |
32 | * mdadm --monitor to monitor failed multipath paths and re-instate them. |
33 | ||
56eedc1a NB |
34 | * Maybe make "--help" fit in 80x24 and have a --long-help with more info. DONE |
35 | ||
36 | ||
d013a55e NB |
37 | * maybe "missing" instead of <bold>missing</> in doco DONE |
38 | * possibly wait for resync to start, or even finish while assembling.- NO | |
39 | ||
40 | * -Db should have a devices= entry if possible. - DONE | |
41 | * when assembling multipath arrays, ignore any error indicators. - DONE | |
42 | * rationalise --monitor usage: | |
43 | mdadm --monitor | |
44 | doesn't do as expected. DONE | |
45 | ||
46 | * --assemble could have a --update option. - DONE | |
5787fa49 NB |
47 | following word can be: |
48 | sparc2.2 | |
49 | super-minor | |
50 | ||
51 | * mdadm /dev/md11, where md11 is raid0 can segfault, particularly when looking in the | |
52 | [UU_UUU] string ... which doesn't exist ! | |
53 | It should be more sensible. DONE | |
54 | ||
55 | Example: | |
56 | ||
57 | from Raimund Sacherer <raimund.sacherer@ngit.at> | |
58 | ||
59 | mke2fs -m0 -q /dev/ram1 300 | |
60 | mount -n -t ext2 /dev/ram1 /tmp | |
61 | echo DEVICE /dev/[sh]* >> /tmp/mdadm.conf | |
62 | mdadm -Esb /dev/[sh]* 2>/dev/null >> /tmp/mdadm.conf | |
63 | mdadm -ARsc /tmp/mdadm.conf | |
64 | umount /tmp | |
64c4757e | 65 | |
cd29a5c8 | 66 | |
e0d19036 | 67 | ?? Allow -S /dev/md? - current complains subsequent not a/d/r - DONE |
cd29a5c8 | 68 | |
56eb10c0 NB |
69 | * new "Query" mode to subsume --detail and --examine. |
70 | --query or -Q, takes a device and tells if it is an MD device, | |
e0d19036 NB |
71 | and also tells in a raid superblock is found. |
72 | DONE | |
56eb10c0 | 73 | |
e0d19036 | 74 | * write mdstat.c to parse /proc/mdstat file |
cd29a5c8 | 75 | Build list of arrays: name, rebuild-percent |
e0d19036 | 76 | DONE |
cd29a5c8 | 77 | |
e0d19036 NB |
78 | * parse /proc/partitions and map major/minor into /dev/* names, |
79 | and use that for default DEVICE list ???? | |
80 | ||
81 | * --detail --scan to read /proc/mdstat, and then iterate over these, | |
cd29a5c8 NB |
82 | but assume --brief. --verbose can override |
83 | check each subdevice to see if it is in conf_get_devs. | |
84 | Warn if not. | |
e0d19036 | 85 | DONE, but don't warn yet... |
cd29a5c8 NB |
86 | |
87 | * Support multipath ... maybe... | |
e0d19036 | 88 | maybe DONE |
cd29a5c8 NB |
89 | |
90 | * --follow to syslog | |
91 | ||
2d465520 | 92 | * --follow to move spares around DONE |
cd29a5c8 | 93 | |
2d465520 | 94 | * --follow to notice other events: DONE |
cd29a5c8 NB |
95 | rebuild started |
96 | spare activated | |
97 | spare removed | |
98 | spare added | |
99 | ||
100 | ------------------------------------ | |
9a9dab36 | 101 | - --examine --scan scans all drives and build an mdadm.conf file DONE |
cd29a5c8 | 102 | |
82b27616 NB |
103 | - check superblock checksum in examine DONE |
104 | - report "chunk" or "rounding" depending on raid level DONE | |
682c7051 NB |
105 | - report "linear" instead of "-1" for raid level DONE |
106 | - decode ayout depending on raid level DONE | |
cd29a5c8 | 107 | - --verbose and --force flags. DONE |
682c7051 | 108 | |
82b27616 | 109 | - set md_minor, *_disks for Create - DONE |
682c7051 NB |
110 | - for create raid5, how to choose between |
111 | all working, but not insync | |
cd29a5c8 NB |
112 | one missing, one spare, insync DONE (--force) |
113 | - and for raid1 - some failed drives... (missing) | |
52826846 | 114 | |
82b27616 NB |
115 | - when RUN_ARRAY, make sure *_disks counts are right |
116 | ||
117 | - get --detail to extract extra stuff from superblock, | |
118 | like uuid DONE | |
cd29a5c8 | 119 | - --detail --brief to give a config file line DONE |
82b27616 NB |
120 | - parse config file. DONE |
121 | - test... | |
122 | ||
123 | - when --assemble --scan, if an underlying device is an md device, | |
124 | then try to assemble that device first. | |
0db17fcb NB |
125 | |
126 | ||
9a9dab36 | 127 | - mdadm -S /dev/md0 /dev/md1 gives internal error FIXED |
52826846 | 128 | |
56eedc1a | 129 | - mdadm --detail --scan print summary of what it can find? DONE |
52826846 NB |
130 | |
131 | ||
132 | --------- | |
133 | Assemble doesn't add spares. - DONE | |
134 | Create to allow "missing" name for devices. | |
135 | Create to accept "--force" for do exactly what is requested | |
136 | - get Assemble to upgrade devices if force flag. | |
137 | ARRAY lines in config file to have super_minor=n | |
138 | ARRAY lines in config file to have device=pattern, and only accept | |
139 | those devices | |
140 | If UUID given, insist on that | |
141 | If not, but super_minor given, require all found with that minor | |
142 | to have same uuid | |
143 | If only device given, all valid supers on those devices must have | |
144 | same uuid | |
145 | allow /dev/mdX as first argument before any options | |
146 | Possible --dry-run option for create and assemble--force | |
147 | ||
148 | Assemble to check that all devices mentioned in superblock | |
149 | are present. | |
150 | ||
151 | New mode: --Monitor (or --Follow) | |
152 | Periodically check status of all arrays (listed in config file). | |
153 | Log every event and apparent cause - or differences | |
154 | Email and alert - or run a program - for important events | |
155 | Move spares around if necessary. | |
156 | ||
157 | An Array line can have a spare-group= field that indicates that | |
158 | the array shares spares with other arrays with the same | |
159 | spare-group name. | |
160 | If an array has a failed and no spares, then check all other | |
161 | arrays in the spare group. If one has no failures and a spare, | |
162 | then consider that spare. | |
163 | Choose the smallest considered spare that is large enough. | |
164 | If there is one, then hot-remove it from it's home, and | |
165 | hot-add it to the array in question. | |
166 | ||
167 | --mail-to address | |
168 | --alert-handler program | |
169 | ||
170 | Will also extract information from /proc/mdstat if present, | |
171 | and consider 20% marks in rebuild as events. | |
172 | ||
173 | Events are: | |
174 | drive fails - causes mail to be sent | |
175 | rebuild started | |
176 | spare activated | |
177 | spare removed | |
cd29a5c8 | 178 | spare added |