Thursday, January 6, 2011

ASM vs SLVM


ASM over SLVM

       ASM Lacks Multipathing
       The ASM-over-SLVM configuration provides multipathing for ASM disk groups (using LVM PV Links or storage based multipathing)
       ASM-over-SLVM enables the HP-UX devices used for disk group members to have the same names on all nodes, easing ASM configuration
       ASM-over-SLVM protects ASM data against inadvertent overwrites from nodes inside/outside the cluster
       If the ASM disk group members are raw disks, there is no protection currently preventing these disks from being incorporated into LVM or VxVM volume/disk groups
       Disadvantages
       Additional configuration and management tasks imposed by the extra layer of volume management (administration of volume groups, logical volumes, physical volumes)
       Performance impact of extra layer of volume management
       SLVM has less online reconfiguration capabilities than CVM

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