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I don't think in performance, but the difference is that with -v the variable "a" is available also in the BEGIN section. If you don't need that, then you can use the other option.

Also note that...

instead of using -v switch to pass the SHELL variable to the awklet ,you can use like below .

awk '$1==a' a=$NU input-file

this works:
pandeeswaran@ubuntu:~$ awk -v a=$NU '$1==a' file
PSAPSR7 1562000 77000.1875 5 95
pandeeswaran@ubuntu:~$

And the benefit of using SVM/SDS is that its very quick to get out of if by some odd reason SDS or the config should be corrupted as the underlying filesystem is not changed.

With Veritas your a...

@Reboot: Beware not confusing volume management and file systems. VxFS isn't supported by the OpenBoot Prom so you just can't boot a kernel located on such a file system. Only UFS and now ZFS can be...

SDS or SVM is easy to set up either manually or through jumpstart, troubleshoot, maintain, and is the de-facto software disk manager solution on Solaris, and it works perfectly well.

Why bother...