66f8bbbe90
From: Doug Ledford <dledford@redhat.com> This one actually does a couple things. Mainly related to raid4, but kinda touches other raid levels some. When creating a raid4 array, treat it like a raid5 array in that we create it in degraded mode by default and add the last disk as a spare. Besides speeding things up, this has a second effect that it makes mdadm more consistent. In order to create a degraded raid5 array, you need only passing missing as one of the devices. For a degraded raid4 array, prior to this patch, you must pass assume-clean or else it refuses to create the array. Even force won't make it work without assume-clean. With the patch, raid4 behaves identical to raid5. Separate from that, the monitor functionality completely ignores raid4 arrays. That seems to stem from the code that checks to see if the array is part of a long list of types. It seems easier to check which array types *aren't* redundant instead of listing the ones that are redundant and missing some of them. This makes the monitor service actually watch raid4 arrays.
17 lines
321 B
Plaintext
17 lines
321 B
Plaintext
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# create a simple raid4 set
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mdadm -CfR $md0 -l 4 -n3 $dev0 $dev1 $dev2
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check resync ; check raid[45]
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testdev $md0 2 $mdsize0 64
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mdadm -S $md0
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# now with version-1 superblock
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mdadm -CR $md0 -e1 --level=raid4 -n4 $dev0 $dev1 $dev2 $dev3
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check recovery; check raid[45]
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testdev $md0 3 $mdsize1 64
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mdadm -S $md0
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exit 0
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