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Diffstat (limited to 'md.4')
| -rw-r--r-- | md.4 | 14 |
1 files changed, 14 insertions, 0 deletions
@@ -193,6 +193,20 @@ smallest device has been exhausted, the RAID0 driver starts collecting chunks into smaller stripes that only span the drives which still have remaining space. +A bug was introduced in linux 3.14 which changed the layout of blocks in +a RAID0 beyond the region that is striped over all devices. This bug +does not affect an array with all devices the same size, but can affect +other RAID0 arrays. + +Linux 5.4 (and some stable kernels to which the change was backported) +will not normally assemble such an array as it cannot know which layout +to use. There is a module parameter "raid0.default_layout" which can be +set to "1" to force the kernel to use the pre-3.14 layout or to "2" to +force it to use the 3.14-and-later layout. when creating a new RAID0 +array, +.I mdadm +will record the chosen layout in the metadata in a way that allows newer +kernels to assemble the array without needing a module parameter. .SS RAID1 |