reallocate vs wafl scan reallocate

[saranraj456]

Frndz,

What was d difference between these two commands

reallocate start <vol name>

wafl scan reallocate

[DOUGLASSIGGINS]

Greetings,

I believe this command is the same thing. As reallocate use matured the command became reallocate. The old way of doing things was through wafl scan reallocate.

These days I have been using reallocate.

[saranraj456]

Actually as per the man page define WAFL scan reallocate will do the restructuring of ALL blocks even if it is assume not to give any performance improvements. If that is the case why we need to go for this option.

Saran

[DOUGLASSIGGINS]

Greetings,

The -f parameter with reallocate command is equivalent:

In addition, full one-time reallocation of a  large file, LUN or a whole volume, can be forced by using the -f option with reallocate start.  A  full  reallocation  will reallocate data unless the performance is predicated to be worse after the movement. Full reallocation is  equivalent to using wafl scan reallocate.

Reallocate should only be used if you see some disks in an aggregate with much more utilization than others. The reallocate measure command takes a look and takes a best guess at whether or not the reallocation will provide benefit.