One question are these Escon or Ficon, with Escon you may see
unpredictable performance results if more stripes than paths exist (as
described by Brandon) , this should not be a problem with Ficon.
Phil
Brandon Darbro wrote:
Stefan Bader wrote:
path. So you should/must rather use 12stripes because
3. LVM wants to put <volume size>/<stripes> to each disk and won't add
space from another space
do so. So 27G/8 requires around 3G on 8 free PVs and yours only have
2.25G.. So 12 stripes
should work.8 won't.
I've found that using 12 stripes on 8 paths had some times slower
performance than 4 stripes (greatest common denominator of disks and i/o
paths). Depended on the type of writes being done and was also very
inconsistent. 4 stripes acted predictably, 12 would give me good and
bad performance inconsistently. As a result, I always use the greatest
common denominator.
--
Brandon S. Darbro
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