[Veritas-vx] Relayout volume from 2 to 4 columns

[przemolicc at poczta.fm]

Hello,

we are using VSF 5.0 MP3 on Solaris 10 attached to SAN-based hardware array.
On this array we have created 2 raid groups and on each RG we have created
a few LUNs:

raid group:   RG1    RG2
              LUN1   LUN7
              LUN2   LUN8
              LUN3   LUN9
              LUN4   LUN10
              LUN5   LUN11
              LUN6   LUN12

For performance reason some of our volumes are striped between the two raid groups
(using two columns ncol=2) e.g.:

pl <name> <vol> ENABLED ACTIVE 419256320 STRIPE 2/128 RW

In this configuration IOs involves two raid groups.

It seems that in the future in certain cases performance might be not as expected
so we would like to add two additional LUNs (taken from two additional raid groups)
and relayout the whole volume from 2-col to 4-cols e.g.:

raid group:   RG1    RG2    RG3    RG4
              LUN1   LUN7   LUN13  LUN19
              LUN2   LUN8   LUN14  LUN20
              LUN3   LUN9   LUN15  LUN21
              LUN4   LUN10  LUN16  LUN22
              LUN5   LUN11  LUN17  LUN23
              LUN6   LUN12  LUN18  LUN24

Is it possible to order relayout of existings volumes to spread it over all four
RGs ? Can I point somehow that it should relayout using these particular LUNs ?


Regards
Przemyslaw Bak (przemol)
--
http://przemol.blogspot.com/





























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