One or more SAN Volume Mount Point Icon(s) go missing from the Desktop but the Volume is mounted.

(This has been observed on 10.7 and 10.8 clients)

LIST PERMISSIONS (the @ means there are extended attributes)

DOCFCP1-2:Volumes root# cd /Volumes/
DOCFCP1-2:Volumes root# ls -laheO
total 393224
drwxrwxrwt@ 11 root      admin     hidden  374B Mar 12 11:31 .
 0: group:everyone deny add_file,add_subdirectory,directory_inherit,only_inherit
drwxr-xr-x@ 33 root      wheel     -       1.2K Feb 23 14:38 ..
drwxrwxrwx  18 _unknown  _unknown  -       680B Feb 20 00:59 FCP1B_12tb
drwxrwxr-x  15 user1  staff     -       578B Feb 23 14:19 Local Media
lrwxr-xr-x   1 root      admin     -         1B Mar 12 11:18 Macintosh HD -> /
drwxrwxrwx  17 root      wheel     -       2.0K Mar 12 15:27 SAN_0
drwxrwxrwx@ 29 root      wheel     -        24K Mar 13 15:29 SAN_1
drwxrwxrwx  19 root      wheel     -       2.0K Mar 13 10:35 SAN_2
drwxrwxrwx  13 root      wheel     -       6.0K Mar 12 23:57 SAN_3
drwxrwxrwx  19 root      wheel     -       2.0K Mar 13 02:56 SAN_4
drwxrwxrwx  14 root      wheel     -       6.0K Mar 13 14:59 SAN_5

LIST EXTENDED ATTRIBUTES

DOCFCP1-2:Volumes root# xattr -l SAN_1
com.apple.FinderInfo:
00000000  00 00 00 00 00 00 00 00 40 00 00 00 00 00 00 00  |........@.......|
00000010  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  |................|
00000020

CLEAR ALL EXTENDED ATTRIBUTES

DOCFCP1-2:Volumes root# xattr -c SAN_1          

LIST EXTENDED ATTRIBUTES (no results mean no attributes)

                            
DOCFCP1-2:Volumes root# xattr -l SAN_1

LIST PERMISSIONS

DOCFCP1-2:Volumes root# ls -laheO                                               
total 393224
drwxrwxrwt@ 11 root      admin     hidden  374B Mar 12 11:31 .
 0: group:everyone deny add_file,add_subdirectory,directory_inherit,only_inherit
drwxr-xr-x@ 33 root      wheel     -       1.2K Feb 23 14:38 ..
drwxrwxrwx  18 _unknown  _unknown  -       680B Feb 20 00:59 FCP1B_12tb
drwxrwxr-x  15 user1  staff     -       578B Feb 23 14:19 Local Media
lrwxr-xr-x   1 root      admin     -         1B Mar 12 11:18 Macintosh HD -> /
drwxrwxrwx  17 root      wheel     -       2.0K Mar 12 15:27 SAN_0
drwxrwxrwx  28 root      wheel     -        24K Mar 13 16:47 SAN_1
drwxrwxrwx  19 root      wheel     -       2.0K Mar 13 10:35 SAN_2
drwxrwxrwx  13 root      wheel     -       6.0K Mar 12 23:57 SAN_3
drwxrwxrwx  19 root      wheel     -       2.0K Mar 13 02:56 SAN_4
drwxrwxrwx  14 root      wheel     -       6.0K Mar 13 14:59 SAN_5