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Document usage of version0.91 superblock.

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Neil Brown 2006-08-07 11:11:42 +10:00
parent 2a91e1491e
commit 2a940e3619
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ChangeLog
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@ -1,3 +1,6 @@
Changes Prior to 2.5.3 release
- Document v0.91 superblocks in md.4
Changes Prior to 2.5.2 release
- Fix problem with compiling with gcc-2 compilers
- Fix compile problem of post-incrmenting a variable in a macro arg.

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md.4
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@ -74,6 +74,14 @@ UUID
a 128 bit Universally Unique Identifier that identifies the array that
this device is part of.
When a version 0.90 array is being reshaped (e.g. adding extra devices
to a RAID5), the version number is temporarily set to 0.91. This
ensures that if the reshape process is stopped in the middle (e.g. by
a system crash) and the machine boots into an older kernel that does
not support reshaping, then the array will not be assembled (which
would cause data corruption) but will be left untouched until a kernel
that can complete the reshape processes is used.
.SS ARRAYS WITHOUT SUPERBLOCKS
While it is usually best to create arrays with superblocks so that
they can be assembled reliably, there are some circumstances where an