This is what I did: Expanded Block Pool(FAST) in Unisphere. Selected recommended disks by Unisphere that tries to match up Raid groups types with existing RG's in pool. Created LUN's in Block pool. Added LUN's to ~filestorage group with HLU's greater than 16. Scanned server_devconfig server_x -c -s -a # This scanned new disks and automatically added to existing Block Mapped File-pool. Extended File system.  Thanks.
I am trying to extend Mapped FILE_cl-GFFF3_p1  File pool on VNX. This is what I am planning to do.   - Create 10 LUN's  in BLOCK POOL FILE_cl-GFFF3_p1 and add them to ~filestorage group with HLU greater than 16. - rescan storage on NAS - At this point I am unsure if I have to run nas_pool -xtend for the pool to show up new space in FILE_cl-GFFF3_p1.   # nas_version 7.1.76-4  [nasadmin[NAME] ~]$ nas_pool -size -all id           = 42 name         = FILE_cl-GFFF4 used_mb      = 21649049 avail_mb     = 203719 total_mb     = 21852768 potential_mb = 0  id           = 43 name         = FILE_cl-GFFF3_p1 used_mb      = 13469120 avail_mb     = 16956 total_mb     = 13486076 potential_mb = 0  [nasadmin[NAME] ~]$ nas_pool -info -all id                   = 42 name                 = FILE_cl-GFFF4 description          = Mapped Pool FILE_cl-GFFF4 on APM0013XXXXXX acl                  = 0 in_use               = True clients              = root_fs_vdm_VDM_01,root_fs_vdm_VDM_02,root_fs_vdm_VDM_03,HOSt4x4x05_                                                   members              = v127,v131,v134,v146 storage_system(s)    = APM0013XXXXXX default_slice_flag   = True is_user_defined      = False thin                 = False tiering_policy       = Auto-Tier/Highest Available Tier compressed           = False mirrored             = False disk_type            = Capacity server_visibility    = server_2,server_3 volume_profile       = FILE_cl-GFFF4_vp is_dynamic           = True is_greedy            = N/A num_stripe_members   = 5 stripe_size          = 262144  id                   = 43 name                 = FILE_cl-GFFF3_p1 description          = Mapped Pool FILE_cl-GFFF3_p1 on APM0013XXXXXX acl                  = 0 in_use               = True clients              = HOSt4x4x05_vol02,HOSt4x4x05_vol03,vol35,vol02,vol04,vol08,vol26,vol27                                                 ,vol30,vol28,vpfs375 members              = v137,v141 storage_system(s)    = APM0013XXXXXX default_slice_flag   = True is_user_defined      = False thin                 = False tiering_policy       = Auto-Tier/Highest Available Tier compressed           = False mirrored             = False disk_type            = Mixed server_visibility    = server_2,server_3 volume_profile       = FILE_cl-GFFF3_p1_vp is_dynamic           = True is_greedy            = N/A num_stripe_members   = 5 stripe_size          = 262144  [nasadmin[NAME] ~]$ nas_disk -l id   inuse  sizeMB    storageID-devID   type  name          servers 1     y      11260  APM0013XXXXXX-2007 CLSTD root_disk     1,2 2     y      11260  APM0013XXXXXX-2008 CLSTD root_ldisk    1,2 3     y       2038  APM0013XXXXXX-2009 CLSTD d3            1,2 4     y       2038  APM0013XXXXXX-200A CLSTD d4            1,2 5     y       2044  APM0013XXXXXX-200B CLSTD d5            1,2 6     y      65526  APM0013XXXXXX-200C CLSTD d6            1,2 7     y    1092638  APM0013XXXXXX-007F CAPAC d7            1,2 8     y    1092638  APM0013XXXXXX-0080 CAPAC d8            1,2 9     y    1092638  APM0013XXXXXX-0081 CAPAC d9            1,2 10    y    1348607  APM0013XXXXXX-0064 MIXED d10           1,2 11    y    1348607  APM0013XXXXXX-0065 MIXED d11           1,2 12    y    1348607  APM0013XXXXXX-0066 MIXED d12           1,2 13    y    1348607  APM0013XXXXXX-0067 MIXED d13           1,2 14    y    1348607  APM0013XXXXXX-0068 MIXED d14           1,2 15    y    1348607  APM0013XXXXXX-0069 MIXED d15           1,2 16    y    1348607  APM0013XXXXXX-006A MIXED d16           1,2 17    y    1348607  APM0013XXXXXX-006B MIXED d17           1,2 18    y    1348607  APM0013XXXXXX-006C MIXED d18           1,2 19    y    1348607  APM0013XXXXXX-006D MIXED d19           1,2 20    y    1092638  APM0013XXXXXX-006E CAPAC d20           1,2 21    y    1092638  APM0013XXXXXX-006F CAPAC d21           1,2 22    y    1092638  APM0013XXXXXX-0070 CAPAC d22           1,2 23    y    1092638  APM0013XXXXXX-0071 CAPAC d23           1,2 24    y    1092638  APM0013XXXXXX-0072 CAPAC d24           1,2 25    y    1092638  APM0013XXXXXX-0073 CAPAC d25           1,2 26    y    1092638  APM0013XXXXXX-0074 CAPAC d26           1,2 27    y    1092638  APM0013XXXXXX-0075 CAPAC d27           1,2 28    y    1092638  APM0013XXXXXX-0077 CAPAC d28           1,2 29    y    1092638  APM0013XXXXXX-0076 CAPAC d29           1,2 30    y    1092638  APM0013XXXXXX-0079 CAPAC d30           1,2 31    y    1092638  APM0013XXXXXX-0078 CAPAC d31           1,2 32    y    1092638  APM0013XXXXXX-007B CAPAC d32           1,2 33    y    1092638  APM0013XXXXXX-007A CAPAC d33           1,2 34    y    1092638  APM0013XXXXXX-007D CAPAC d34           1,2 35    y    1092638  APM0013XXXXXX-007C CAPAC d35           1,2 36    y    1092638  APM0013XXXXXX-007E CAPAC d36           1,2  [nasadmin[NAME] ~]$ nas_fs -info id=66 id        = 66 name      = vol26 acl       = 0 in_use    = True type      = uxfs worm      = off volume    = v244 pool      = FILE_cl-GFFF3_p1 member_of = root_avm_fs_group_43 rw_servers= server_2 ro_servers= rw_vdms   = ro_vdms   = auto_ext  = no,thin=no fast_clone_level = 1 deduplication   = Off thin_storage    = False tiering_policy  = Auto-Tier/Highest Available Tier compressed= False mirrored  = False stor_devs = APM0013XXXXXX-0069,APM0013XXXXXX-006A,APM0013XXXXXX-006B,APM0013XXXXXX-006C,APM0013XXXXXX-006D disks     = d15,d16,d17,d18,d19  disk=d15   stor_dev=APM0013XXXXXX-0069 addr=c0t1l9         server=server_2  disk=d15   stor_dev=APM0013XXXXXX-0069 addr=c16t1l9        server=server_2  disk=d16   stor_dev=APM0013XXXXXX-006A addr=c0t1l10        server=server_2  disk=d16   stor_dev=APM0013XXXXXX-006A addr=c16t1l10       server=server_2  disk=d17   stor_dev=APM0013XXXXXX-006B addr=c0t1l11        server=server_2  disk=d17   stor_dev=APM0013XXXXXX-006B addr=c16t1l11       server=server_2  disk=d18   stor_dev=APM0013XXXXXX-006C addr=c0t1l12        server=server_2  disk=d18   stor_dev=APM0013XXXXXX-006C addr=c16t1l12       server=server_2  disk=d19   stor_dev=APM0013XXXXXX-006D addr=c0t1l13        server=server_2  disk=d19   stor_dev=APM0013XXXXXX-006D addr=c16t1l13       server=server_2  nas_storage -info -all >> file. more file id                    = 0000 storage profiles      = 1 - FILE_cl-GFFF3_p1 raid_type             = Mixed logical_capacity      = 28419379200 num_spindles          = 18 - 1_1_3 0_0_7 0_0_9 0_0_10 0_0_12 0_1_1 0_1_3 1_1_2 1_1_4 0_1_0 1_1_1 0_0_6 0_0_8 0_1_2 1_1_0 0_0_11 0_0_13 0_1_4 num_luns              = 10 - 00109 00103 00108 00107 00102 00106 00100 00104 00101 00105 num_disk_volumes      = 10 - d19 d13 d18 d17 d12 d16 d10 d14 d11 d15 spindle_type          = MIXED bus                   = mixed virtually_provisioned = True name                  = FILE_cl-GFFF3_p1 subscribed_capacity   = 28419379200 physical_capacity     = 29081272320 used_capacity         = 28419379200 free_capacity         = 661893120 percent_full_threshold= 70% hidden                = False  id                    = 0001 storage profiles      = 3 - clarata_r6,cmata_r6,FILE_cl-GFFF4 raid_type             = RAID6 logical_capacity      = 46069862400 num_spindles          = 16 - 1_1_7 1_1_9 1_1_12 0_1_10 1_1_11 0_1_7 0_1_9 1_1_6 1_1_8 0_1_12 1_1_10 1_1_13 0_1_6 0_1_8 0_1_11 0_1_13 num_luns              = 20 - 00123 00127 00116 00112 00122 00111 00121 00125 00118 00129 00114 00115 00119 00110 00120 00124 00128 00117 00113 00126 num_disk_volumes      = 20 - d32 d7 d26 d22 d33 d21 d30 d34 d29 d9 d24 d25 d28 d20 d31 d35 d8 d27 d23 d36 spindle_type          = NLSAS bus                   = mixed virtually_provisioned = True name                  = FILE_cl-GFFF4 subscribed_capacity   = 46069862400 physical_capacity     = 46109786112 used_capacity         = 46069862400 free_capacity         = 39923712 percent_full_threshold= 70% hidden                = False  naviseccli -User  storagepool -list  [nasadmin[NAME] ~]$ /nas/sbin/naviseccli -h storagepool -list Pool Name:  FILE_cl-GFFF3_p1 Pool ID:  0 Raid Type:  Mixed Percent Full Threshold:  70 Description: Disk Type:  Mixed State:  Ready Status:  OK(0x0) Current Operation:  None Current Operation State:  N/A Current Operation Status:  N/A Current Operation Percent Completed:  0 Raw Capacity (Blocks):  38327765393 Raw Capacity (GBs):  18276.103 User Capacity (Blocks):  29081272320 User Capacity (GBs):  13867.031 Consumed Capacity (Blocks):  28419379200 Consumed Capacity (GBs):  13551.416 Available Capacity (Blocks):  661893120 Available Capacity (GBs):  315.615 Percent Full:  97.724 Total Subscribed Capacity (Blocks):  28419379200 Total Subscribed Capacity (GBs):  13551.416 Percent Subscribed:  97.724 Oversubscribed by (Blocks):  0 Oversubscribed by (GBs):  0.000 Disks: Bus 1 Enclosure 1 Disk 3 Bus 0 Enclosure 0 Disk 7 Bus 0 Enclosure 0 Disk 9 Bus 0 Enclosure 0 Disk 10 Bus 0 Enclosure 0 Disk 12 Bus 0 Enclosure 1 Disk 1 Bus 0 Enclosure 1 Disk 3 Bus 1 Enclosure 1 Disk 2 Bus 1 Enclosure 1 Disk 4 Bus 0 Enclosure 1 Disk 0 Bus 1 Enclosure 1 Disk 1 Bus 0 Enclosure 0 Disk 6 Bus 0 Enclosure 0 Disk 8 Bus 0 Enclosure 1 Disk 2 Bus 1 Enclosure 1 Disk 0 Bus 0 Enclosure 0 Disk 11 Bus 0 Enclosure 0 Disk 13 Bus 0 Enclosure 1 Disk 4 LUNs:  109, 103, 108, 107, 102, 106, 100, 104, 101, 105  Pool Name:  FILE_cl-GFFF4 Pool ID:  1 Raid Type:  r_6 Percent Full Threshold:  70 Description: Disk Type:  NL SAS State:  Ready Status:  OK(0x0) Current Operation:  None Current Operation State:  N/A Current Operation Status:  N/A Current Operation Percent Completed:  0 Raw Capacity (Blocks):  61550736416 Raw Capacity (GBs):  29349.678 User Capacity (Blocks):  46109786112 User Capacity (GBs):  21986.859 Consumed Capacity (Blocks):  46069862400 Consumed Capacity (GBs):  21967.822 Available Capacity (Blocks):  39923712 Available Capacity (GBs):  19.037 Percent Full:  99.913 Total Subscribed Capacity (Blocks):  46069862400 Total Subscribed Capacity (GBs):  21967.822 Percent Subscribed:  99.913 Oversubscribed by (Blocks):  0 Oversubscribed by (GBs):  0.000 Disks: Bus 1 Enclosure 1 Disk 7 Bus 1 Enclosure 1 Disk 9 Bus 1 Enclosure 1 Disk 12 Bus 0 Enclosure 1 Disk 10 Bus 1 Enclosure 1 Disk 11 Bus 0 Enclosure 1 Disk 7 Bus 0 Enclosure 1 Disk 9 Bus 1 Enclosure 1 Disk 6 Bus 1 Enclosure 1 Disk 8 Bus 0 Enclosure 1 Disk 12 Bus 1 Enclosure 1 Disk 10 Bus 1 Enclosure 1 Disk 13 Bus 0 Enclosure 1 Disk 6 Bus 0 Enclosure 1 Disk 8 Bus 0 Enclosure 1 Disk 11 Bus 0 Enclosure 1 Disk 13 LUNs:  123, 127, 116, 112, 122, 111, 121, 125, 118, 129, 114, 115, 119, 110, 120, 124, 128, 117, 113, 126
VNX file extend block mapped pool