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calculate automatic node based symmetry (#9446)

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it is possible in many screnarios that even
if the divisible value is optimal, we may
end up with uneven distribution due to number
of nodes present in the configuration.

added code allow for affinity towards various
ellipses to figure out optimal value across
ellipses such that we can always reach a
symmetric value automatically.

Fixes #9416
This commit is contained in:
Harshavardhana
2020-04-27 14:39:57 -07:00
committed by GitHub
parent 97d952e61c
commit bc61417284
8 changed files with 145 additions and 34 deletions
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cmd/format-xl.go
+4 -1
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@@ -456,7 +456,10 @@ func checkFormatXLValues(formats []*formatXLV3, drivesPerSet int) error {
return fmt.Errorf("%s disk is already being used in another erasure deployment. (Number of disks specified: %d but the number of disks found in the %s disk's format.json: %d)",
humanize.Ordinal(i+1), len(formats), humanize.Ordinal(i+1), len(formatXL.XL.Sets)*len(formatXL.XL.Sets[0]))
}
if len(formatXL.XL.Sets[0]) != drivesPerSet {
// Only if custom erasure drive count is set,
// we should fail here other proceed to honor what
// is present on the disk.
if globalCustomErasureDriveCount && len(formatXL.XL.Sets[0]) != drivesPerSet {
return fmt.Errorf("%s disk is already formatted with %d drives per erasure set. This cannot be changed to %d, please revert your MINIO_ERASURE_SET_DRIVE_COUNT setting", humanize.Ordinal(i+1), len(formatXL.XL.Sets[0]), drivesPerSet)
}
}