How to sort this output 1,10,11..2

Your best bet is piping to GNU sort, with GNU sort's --version-sort option enabled

so that would be oracleasm listdisks | sort --version-sort

From the info page

--version-sort’
     Sort by version name and number.  It behaves like a standard sort,
     except that each sequence of decimal digits is treated numerically
     as an index/version number.  (*Note Details about version sort::.)

On your input it gives me

DATA1
DATA2
DATA3
DATA4
DATA5
DATA6
DATA7
DATA8
DATA9
DATA10
DATA11
DATA12
FRA1
FRA2
FRA3
FRA10
FRA11
OCR1
OCR2
OCR3

If sort --version-sort is not available, split into 2 fields: field 1 = leading non-digits, and field 2 = integer number, and print the fields with TAB between them. Then use sort on 2 TAB-delimited fields, then remove the TAB. Connect by pipes to avoid I/O overhead. Here is an example with a minimal slice of the data from the OP, plus a few additional records:

echo 1 10 2 11 DATA DATA1 DATA10 DATA11 DATA2 FRA FRA1 FRA10 FRA11 FRA2 | \
    xargs -n1 | \
    perl -lne 'print join "\t", /(\D*)(\d*)/' | \
    sort -k1,1 -k2,2n | \
    perl -pe 's/\t//'

Prints:

1
10
11
2
DATA
DATA1
DATA2
DATA10
DATA11
FRA
FRA1
FRA2
FRA10
FRA11

DETAILS:

The perl one-liners use these command line flags:
-e : tells Perl to look for code in-line, instead of in a file.
-n : loop over the input one line at a time, assigning it to $_ by default.
-l : strip the input line separator ("\n" on *NIX by default) before executing the code in-line, and append it when printing.
-p : same as -n, but also print the line at the end of each loop (eliminates explicit print).

Within the first one-liner, \d is any digit (0-9), and \D is any non-digit. Each of these patterns is repeated 0 or more times (using *). The two patterns are captured using parentheses and returned as a LIST of two fields, which are joined on a TAB and printed.

The second Perl one-liner simply removes the first TAB is finds with nothing (empty string) and prints the line.

To sort on 2 fields, these options are used: -k1,1 : sort on field 1 ASCIIbetically. Then:
-k2,2n : if field 1 is the same, sort on field 2 numerically (-n option).
Note that the field number is repeated twice (e.g., 1,1), to prevent sorting on the rest of the line and limit the sort to just this column number.