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--- Comment #29 from Alasdair Kergon <agk(a)redhat.com> 2010-04-27 17:21:00 EDT ---
The default behaviour has to be satisfactory for all users. There are also
choices in defining fallback behaviour - how do 'variable' numbers of stripes
interact with the existing allocation policies?
And if I have 5 disks with different amounts of free space on each: I try
striping across all 5 but it doesn't fit. Do I then try 4? Then 3, 2 before
falling back to linear? Or do I stripe as much as I can 5-way, then try to
find the remaining space 4-way, then what still remains, 3-way etc.?
Striping offers some people (not everyone) improved performance at the cost of
making data recoverability useless for most people. The default option must
err on the side of better recoverability. People who have already taken
measures to protect against data loss (mirrors, frequent backups) or whose data
has no special value (e.g. installations that are easily recreated) can opt for
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