Annotated edit history of
RaidNotes version 7, including all changes.
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| Rev |
Author |
# |
Line |
| 6 |
JohnMcPherson |
1 |
!! mdadm: _device_ is too small: 0K |
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2 |
<verbatim> |
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3 |
mdadm: /dev/sda3 is too small: 0K |
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4 |
mdadm: create aborted |
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5 |
</verbatim> |
| 1 |
KragenSitaker |
6 |
|
| 6 |
JohnMcPherson |
7 |
Check that the /dev/sda3 special file is actually correct. If you inadvertantly screw up your mdadm command (eg giving /dev/sda3 as the first non-option argument), then mdadm will quite happily replace your /dev/sda3 special with an md special: |
| 1 |
KragenSitaker |
8 |
|
| 6 |
JohnMcPherson |
9 |
<verbatim> |
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|
10 |
# ls -ld /dev/sda* |
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11 |
brw-rw---- 1 root disk 8, 0 2009-05-05 18:20 /dev/sda |
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12 |
brw-rw---- 1 root disk 8, 1 2009-05-05 19:14 /dev/sda1 |
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13 |
brw-rw---- 1 root disk 8, 2 2009-05-05 19:19 /dev/sda2 |
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14 |
brw-r--r-- 1 root root 9, 0 2009-05-05 20:06 /dev/sda3 |
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15 |
</verbatim> |
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16 |
To fix (obviously replacing "sda3" with whatever device you are actually having problems with): |
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<verbatim> |
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18 |
# rm /dev/sda3 |
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19 |
# mknod /dev/sda3 b 8 3 |
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20 |
</verbatim> |
| 1 |
KragenSitaker |
21 |
|
| 6 |
JohnMcPherson |
22 |
!!Migrating an existing partition to raid1 |
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|
23 |
You can create a raid1 that is initially degraded; once all the data is on it and you are running from that, then you can add more devices to the raid1 and it will "rebuild" it in the background. |
| 3 |
KragenSitaker |
24 |
|
| 6 |
JohnMcPherson |
25 |
Eg: |
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|
26 |
<verbatim> |
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|
27 |
# mdadm --create /dev/md0 --raid-devices=2 --level=raid1 /dev/sdb1 missing |
| 5 |
CraigBox |
28 |
|
| 6 |
JohnMcPherson |
29 |
size=296696452K mtime=Tue May 5 19:29:00 2009 |
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|
30 |
mdadm: array /dev/md0 started. |
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|
31 |
# (mkfs.xxx /dev/md0) |
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|
32 |
# (mount and cp stuff from sda1 to /dev/md0) |
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33 |
# ... (once sda1 is no longer in use, and the same size) |
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34 |
# mdadm --add /dev/md0 /dev/sda1 |
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35 |
</verbatim> |
| 7 |
AlPyat |
36 |
---- |
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|
37 |
!!Resources: |
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38 |
* [RAID Center-RAID Disk Space Calculator, Tools and Comparison Charts|http://www.icc-usa.com/store/pc/viewContent.asp?idpage=7] |
| 5 |
CraigBox |
39 |
---- |
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|
40 |
CategoryDiskNotes |
