Storage : Expansion of solaris filesystem after expanding the corresponding LUN from storage.

Procedure to expand default partition table using native OS utilities:

Note: Because the partition table will be removed and rewritten, the following procedure is appropriate ONLY when the file system on the disk has been created on slice 2 and spans the entire Symmetrix volume.

The following procedure rewrites the partition table and is designed to be used only with disk devices that have been configured with a single file system on slice2 (the backup partition) of the disk.

General steps for logical volume and file system expansion:

In the following example a  we assume a storage LUN from a Symmetrix device is expanded with addition size.

The partition table (viewed from format) shows the current size of the disk, which is 12.64 GB:

# format
…
partition> print
Current partition table (original):
Total disk cylinders available: 13807 + 2 (reserved cylinders)

Part      Tag    Flag     Cylinders         Size            Blocks
0 unassigned    wm       0                0         (0/0/0)            0
1 unassigned    wm       0                0         (0/0/0)            0
2     backup    wu       0 – 13806       12.64GB (13807/0/0) 26509440
3 unassigned    wm       0                0         (0/0/0)            0
4 unassigned    wm       0                0         (0/0/0)            0
5 unassigned    wm       0                0         (0/0/0)            0
6 unassigned    wm       0                0         (0/0/0)            0
7 unassigned    wm       0                0         (0/0/0)            0

A file system has been created that spans the entire device:

# df -k
Filesystem            kbytes    used    avail capacity  Mounted on
/dev/dsk/c0t0d0s0    8187339 5941342  2164124    74%    /
/proc                      0       0        0     0%    /proc
mnttab                     0       0        0     0%    /etc/mnttab
fd                         0       0        0     0%    /dev/fd
swap                 2028792      40  2028752     1%    /var/run
dmpfs                2028752       0  2028752     0%    /dev/vx/dmp
dmpfs                2028752       0  2028752     0%    /dev/vx/rdmp
swap                 2028752       0  2028752     0%    /tmp
/dev/dsk/c2t0d12s2  13046571     160 12915946     1%    /mp/testfs

The file system contains data:

# ls /mp/testfs
arp.conf        fcip.conf       llc1.conf       ptc.conf        stp4020.conf
audiocs.conf    fcp.conf        lofi.conf       ptsl.conf       sy.conf
audioens.conf   fp.conf         log.conf        qlc.conf        sysmsg.conf
audiots.conf    hci1394.conf    lost+found      ramdisk.conf    tcp6.conf
bofi.conf       icmp6.conf      md.conf         random.conf     tcp.conf
clone.conf      icmp.conf       mm.conf         rts.conf        tl.conf
cn.conf         ifp.conf        nca.conf        sad.conf        udp6.conf
…

1.  LUN expansion from th storage side

# format

…
partition> print
Current partition table (original):
Total disk cylinders available: 13807 + 2 (reserved cylinders)

Part      Tag    Flag     Cylinders         Size            Blocks
0 unassigned    wm       0                0         (0/0/0)            0
1 unassigned    wm       0                0         (0/0/0)            0
2     backup    wu       0 – 13806       12.64GB (13807/0/0) 26509440
3 unassigned    wm       0                0         (0/0/0)            0
4 unassigned    wm       0                0         (0/0/0)            0
5 unassigned    wm       0                0         (0/0/0)            0
6 unassigned    wm       0                0         (0/0/0)            0
7 unassigned    wm       0                0         (0/0/0)            0

2. Unmount the file system.

# umount /mp/testfs

3. Run format, choose ‘type’, followed by ‘0. Auto configure’:

# format
…
Specify disk (enter its number): 14
selecting c2t0d12
[disk formatted]
FORMAT MENU:
disk       – select a disk
type       – select (define) a disk type
partition  – select (define) a partition table
current    – describe the current disk
format     – format and analyze the disk
repair     – repair a defective sector
label      – write label to the disk
analyze    – surface analysis
defect     – defect list management
backup     – search for backup labels
verify     – read and display labels
save       – save new disk/partition definitions
inquiry    – show vendor, product and revision
volname    – set 8-character volume name
!<cmd>     – execute <cmd>, then return
quit
format> type
AVAILABLE DRIVE TYPES:
0. Auto configure
1. Quantum ProDrive 80S
2. Quantum ProDrive 105S
3. CDC Wren IV 94171-344
4. SUN0104
5. SUN0207
6. SUN0327
7. SUN0340
8. SUN0424
9. SUN0535
10. SUN0669
11. SUN1.0G
12. SUN1.05
13. SUN1.3G
14. SUN2.1G
15. SUN2.9G
16. Zip 100
17. Zip 250
18. EMC-SYMMETRIX-5771
19. EMC-SYMMETRIX-5771
20. EMC-SYMMETRIX-5771
21. SUN9.0G
22. EMC-SYMMETRIX-5771
23. other
Specify disk type (enter its number)[20]: 0
c2t0d12: configured with capacity of 16.85GB
<EMC-SYMMETRIX-5771 cyl 18410 alt 2 hd 15 sec 128>
selecting c2t0d12
[disk formatted]

format>

4. Write the new label:

format> label
Ready to label disk, continue? y

format>

The operating system now displays the correct disk size:

format> part
PARTITION MENU:
0      – change `0′ partition
1      – change `1′ partition
2      – change `2′ partition
3      – change `3′ partition
4      – change `4′ partition
5      – change `5′ partition
6      – change `6′ partition
7      – change `7′ partition
select – select a predefined table
modify – modify a predefined partition table
name   – name the current table
print  – display the current table
label  – write partition map and label to the disk
!<cmd> – execute <cmd>, then return
quit
partition> print
Current partition table (default):
Total disk cylinders available: 18410 + 2 (reserved cylinders)

Part      Tag    Flag     Cylinders         Size            Blocks
0       root    wm       0 –   136      128.44MB    (137/0/0)     263040
1       swap    wu     137 –   273      128.44MB    (137/0/0)     263040
2     backup    wu       0 – 18409       16.85GB    (18410/0/0) 35347200
3 unassigned    wm       0                0         (0/0/0)            0
4 unassigned    wm       0                0         (0/0/0)            0
5 unassigned    wm       0                0         (0/0/0)            0
6        usr    wm     274 – 18409       16.60GB    (18136/0/0) 34821120
7 unassigned    wm       0                0         (0/0/0)            0

Note: If “Auto configure” is run but the disk is not labeled,  format will display the new partition table information from host memory, but any attempt to use the newly configured space will fail because the label will still contain the incorrect, older partition information.  This will prevent mkfs from expanding the file system.

5. The file system can now be mounted and expanded:

# mount /dev/dsk/c2t0d12s2 /mp/testfs
# /usr/lib/fs/ufs/mkfs -G -M /mp/testfs /dev/rdsk/c2t0d12s2 34821120
/dev/rdsk/c2t0d12s2:    34821120 sectors in 18136 cylinders of 15 tracks, 128 sectors
17002.5MB in 356 cyl groups (51 c/g, 47.81MB/g, 6016 i/g)
super-block backups (for fsck -F ufs -o b=#) at:
32, 98080, 196128, 294176, 392224, 490272, 588320, 686368, 784416, 882464,
Initializing cylinder groups:
……
super-block backups for last 10 cylinder groups at:
33881632, 33979680, 34077728, 34175776, 34273824, 34371872, 34467872,
34565920, 34663968, 34762016,

Note: to expand a ufs filesystem, you must use the mkfs command from the /usr/lib/fs/ufs directory.

# df -k
Filesystem            kbytes    used   avail capacity  Mounted on
/dev/dsk/c0t0d0s0    8187339 5942357 2163109    74%    /
/proc                      0       0       0     0%    /proc
mnttab                     0       0       0     0%    /etc/mnttab
fd                         0       0       0     0%    /dev/fd
swap                 2050960      40 2050920     1%    /var/run
dmpfs                2050920       0 2050920     0%    /dev/vx/dmp
dmpfs                2050920       0 2050920     0%    /dev/vx/rdmp
swap                 2050920       0 2050920     0%    /tmp
/dev/dsk/c2t0d12s2  17137130     160 17006505    1%    /mp/testfs

The data is preserved:

# cd /mp/testfs
# ls
arp.conf        fcip.conf       llc1.conf       ptc.conf        stp4020.conf
audiocs.conf    fcp.conf        lofi.conf       ptsl.conf       sy.conf
audioens.conf   fp.conf         log.conf        qlc.conf        sysmsg.conf
audiots.conf    hci1394.conf    lost+found      ramdisk.conf    tcp6.conf
bofi.conf       icmp6.conf      md.conf         random.conf     tcp.conf
clone.conf      icmp.conf       mm.conf         rts.conf        tl.conf
…

# cat fp.conf
#
# Copyright (c) 1999, 2001 by Sun Microsystems, Inc.
# All rights reserved.
#
# Sun Fibre Channel Port driver configuration
#
#ident  “@(#)fp.conf    1.2     01/03/30 SMI”
#

name=”fp” port=0;
name=”fp” port=1;

#
# List of ULP modules for loading during port driver attach time
#
load-ulp-list=”1″,”fcp”;
#
# Force attach driver to support hotplug activity (do not remove the property)
#
ddi-forceattach=1;
#

Procedure to  Preserve a custom partition table while allowing the last slice of the disk to be extended

 

Note: In a Solaris environment, only the last partition can be extended because format will only allow the user to specify the new size of the partition. It will not allow the creation of a partition with non-contiguous disk blocks.

In this example, c3t0d61 has a custom partition table with 4 mounted file systems:

partition> print
Current partition table (user_defined):
Total disk cylinders available: 27616 + 2 (reserved cylinders)

Part      Tag    Flag     Cylinders         Size            Blocks
0       root    wm       0 –   136      128.44MB    (137/0/0)     263040
1       swap    wu     137 –   273      128.44MB    (137/0/0)     263040
2     backup    wu       0 – 27615       25.28GB (27616/0/0) 53022720
3 unassigned    wm     274 –  7108        6.26GB    (6835/0/0)  13123200
4 unassigned    wm    7109 – 13943        6.26GB    (6835/0/0)  13123200
5 unassigned    wm   13944 – 20778        6.26GB    (6835/0/0)  13123200
6        usr    wm   20779 – 20780        1.88MB    (2/0/0)         3840
7 unassigned    wm   20781 – 27615        6.26GB    (6835/0/0)  13123200

# df -k
Filesystem            kbytes    used   avail capacity  Mounted on
/dev/dsk/c0t0d0s0   32992541 3194086 29468530   10%    /
/proc                      0       0       0     0%    /proc
mnttab                     0       0       0     0%    /etc/mnttab
fd                         0       0       0     0%    /dev/fd
swap                 2242680     104 2242576     1%    /var/run
dmpfs                2242576       0 2242576     0%    /dev/vx/dmp
dmpfs                2242576       0 2242576     0%    /dev/vx/rdmp
swap                 3318120 1075544 2242576    33%    /tmp
/dev/dsk/c3t0d61s3   6457709       9 6393123     1%    /data3
/dev/dsk/c3t0d61s4   6457709       9 6393123     1%    /data4
/dev/dsk/c3t0d61s5   6457709       9 6393123     1%    /data5
/dev/dsk/c3t0d61s7   6457709       9 6393123     1%    /data7

All of the file systems contain data:

# ls /data3
arp.conf                 log.conf                 sy.conf
audiocs.conf             lost+found               sysmsg.conf
audioens.conf            md.conf                  tcp.conf
audiots.conf             mm.conf                  tcp6.conf
bofi.conf                nca.conf                 tl.conf
clone.conf               ohci.conf                uata.conf
cn.conf                  openeepr.conf            udp.conf
conskbd.conf             options.conf             udp6.conf
consms.conf              pln.conf                 usb_ac.conf
…

# prtvtoc /dev/dsk/c3t0d61s2 > /vtoc_output/c3t0d61.part
# cat /vtoc_output/c3t0d61.part
* /dev/dsk/c3t0d61s2 partition map
*
* Dimensions:
*     512 bytes/sector
*     128 sectors/track
*      15 tracks/cylinder
*    1920 sectors/cylinder
*   27618 cylinders
*   27616 accessible cylinders
*
* Flags:
*   1: unmountable
*  10: read-only
*
*                          First     Sector    Last
* Partition  Tag  Flags    Sector     Count    Sector  Mount Directory
0      2    00          0    263040    263039
1      3    01     263040    263040    526079
2      5    01          0  53022720  53022719
3      0    00     526080  13123200  13649279   /data3
4      0    00   13649280  13123200  26772479   /data4
5      0    00   26772480  13123200  39895679   /data5
6      4    00   39895680      3840  39899519
7      0    00   39899520  13123200  53022719   /data7

# umount /data3
# umount /data4
# umount /data5
# umount /data7
# format
Searching for disks…done

c2t0d46: configured with capacity of 8.43GB
…
c3t0d242: configured with capacity of 3.75MB
AVAILABLE DISK SELECTIONS:
0. c0t0d0 <SUN36G cyl 24620 alt 2 hd 27 sec 107> /pci@1f,4000/scsi@3/sd@0,0
1. c0t1d0 <SUN36G cyl 24620 alt 2 hd 27 sec 107> /pci@1f,4000/scsi@3/sd@1,0
2. c2t0d0 <EMC-SYMMETRIX-5772 cyl 94 alt 2 hd 15 sec 128>
/pci@1f,4000/fibre-channel@5/sd@0,0
3. c2t0d44 <EMC-SYMMETRIX-5772 cyl 9204 alt 2 hd 15 sec 128>
/pci@1f,4000/fibre-channel@5/sd@0,2c
…
19. c2t0d231 <EMC-SYMMETRIX-5772 cyl 4 alt 2 hd 15 sec 128>
/pci@1f,4000/fibre-channel@5/sd@0,e7
20. c2t0d232 <EMC-SYMMETRIX-5772 cyl 4 alt 2 hd 15 sec 128>
/pci@1f,4000/fibre-channel@5/sd@0,e8
21. c2t0d233 <EMC-SYMMETRIX-5772 cyl 4 alt 2 hd 15 sec 128>
/pci@1f,4000/fibre-channel@5/sd@0,e9
22. c3t0d0 <EMC-SYMMETRIX-5772 cyl 94 alt 2 hd 15 sec 128>
/pci@1f,4000/fibre-channel@5,1/sd@0,0
23. c3t0d44 <EMC-SYMMETRIX-5772 cyl 9204 alt 2 hd 15 sec 128>
/pci@1f,4000/fibre-channel@5,1/sd@0,2c

Specify disk (enter its number): 18
selecting c3t0d61
[disk formatted]
FORMAT MENU:
disk       – select a disk
type       – select (define) a disk type
partition  – select (define) a partition table
current    – describe the current disk
format     – format and analyze the disk
repair     – repair a defective sector
label      – write label to the disk
analyze    – surface analysis
defect     – defect list management
backup     – search for backup labels
verify     – read and display labels
save       – save new disk/partition definitions
inquiry    – show vendor, product and revision
volname    – set 8-character volume name
!<cmd>     – execute <cmd>, then return
quit
format> type
AVAILABLE DRIVE TYPES:
0. Auto configure
1. Quantum ProDrive 80S
2. Quantum ProDrive 105S
3. CDC Wren IV 94171-344
4. SUN0104
5. SUN0207
6. SUN0327
7. SUN0340
8. SUN0424
9. SUN0535
10. SUN0669
11. SUN1.0G
12. SUN1.05
13. SUN1.3G
14. SUN2.1G
15. SUN2.9G
16. Zip 100
17. Zip 250
18. SUN36G
19. EMC-SYMMETRIX-5772
20. EMC-SYMMETRIX-5772
21. EMC-SYMMETRIX-5772
22. EMC-SYMMETRIX-5772
23. EMC-SYMMETRIX-5772
24. EMC-SYMMETRIX-5772
25. other
Specify disk type (enter its number)[23]: 0
c2t0d61: configured with capacity of 33.71GB
<EMC-SYMMETRIX-5772 cyl 36822 alt 2 hd 15 sec 128>
selecting c3t0d61
[disk formatted]
format> label
Ready to label disk, continue? y

format> q

The operating system now sees the added space. The size of the disk, reflected in the number of sectors in the backup partition (slice 2), has increased from 53022720 to 70698240:

# prtvtoc /dev/dsk/c3t0d61s2
* /dev/dsk/c3t0d61s2 partition map
*
* Dimensions:
*     512 bytes/sector
*     128 sectors/track
*      15 tracks/cylinder
*    1920 sectors/cylinder
*   36824 cylinders
*   36822 accessible cylinders
*
* Flags:
*   1: unmountable
*  10: read-only
*
*                          First     Sector    Last
* Partition  Tag  Flags    Sector     Count    Sector  Mount Directory
0      2    00          0    263040    263039
1      3    01     263040    263040    526079
2      5    01          0  70698240  70698239
6      4    00     526080  70172160  70698239

The custom partition table can now be restored, but if the file containing the prtvtoc output contains information for slice 2, the fmthard command will fail:

# fmthard -s /vtoc_output/c3t0d61.part /dev/rdsk/c3t0d61s2
fmthard: Partition 2 specifies the full disk and is not equal
full size of disk.  The full disk capacity is 70698240 sectors.

Modify th file which is having prtvtoc output and remove the line related to the slice after that issuing  fmthard command will rewrite the partition table:

* /dev/dsk/c3t0d61s2 partition map

*
* Dimensions:
*     512 bytes/sector
*     128 sectors/track
*      15 tracks/cylinder
*    1920 sectors/cylinder
*   27618 cylinders
*   27616 accessible cylinders
*
* Flags:
*   1: unmountable
*  10: read-only
*
*                          First     Sector    Last
* Partition  Tag  Flags    Sector     Count    Sector  Mount Directory
0      2    00          0    263040    263039
1      3    01     263040    263040    526079

<notice that entry for slice 2 was removed>
3      0    00     526080  13123200  13649279   /data3
4      0    00   13649280  13123200  26772479   /data4
5      0    00   26772480  13123200  39895679   /data5
6      4    00   39895680      3840  39899519
7      0    00   39899520  13123200  53022719   /data7

# fmthard -s /vtoc_output/c3t0d61.part /dev/rdsk/c3t0d61s2
fmthard:  New volume table of contents now in place.

# prtvtoc /dev/dsk/c3t0d61s2
* /dev/dsk/c3t0d61s2 partition map
*
* Dimensions:
*     512 bytes/sector
*     128 sectors/track
*      15 tracks/cylinder
*    1920 sectors/cylinder
*   36824 cylinders
*   36822 accessible cylinders
*
* Flags:
*   1: unmountable
*  10: read-only
*
* Unallocated space:
*       First     Sector    Last
*       Sector     Count    Sector
*    53022720  17675520  70698239
*
*                          First     Sector    Last
* Partition  Tag  Flags    Sector     Count    Sector  Mount Directory
0      2    00          0    263040    263039
1      3    01     263040    263040    526079
2      5    01          0  70698240  70698239
3      0    00     526080  13123200  13649279
4      0    00   13649280  13123200  26772479
5      0    00   26772480  13123200  39895679
6      4    00   39895680      3840  39899519
7      0    00   39899520  13123200  53022719

partition> 7
Part      Tag    Flag     Cylinders         Size            Blocks
7 unassigned    wm   20781 – 27615        6.26GB    (6835/0/0)  13123200

Enter partition id tag[unassigned]:
Enter partition permission flags[wm]:
Enter new starting cyl[20781]:
Enter partition size[13123200b, 6835c, 27615e, 6407.81mb, 6.26gb]: 30798720b
partition> label
Ready to label disk, continue? y

partition> print
Current partition table (unnamed):
Total disk cylinders available: 36822 + 2 (reserved cylinders)

Part      Tag    Flag     Cylinders         Size            Blocks
0       root    wm       0 –   136      128.44MB    (137/0/0)     263040
1       swap    wu     137 –   273      128.44MB    (137/0/0)     263040
2     backup    wu       0 – 36821       33.71GB    (36822/0/0) 70698240
3 unassigned    wm     274 –  7108        6.26GB    (6835/0/0)  13123200
4 unassigned    wm    7109 – 13943        6.26GB    (6835/0/0)  13123200
5 unassigned    wm   13944 – 20778        6.26GB    (6835/0/0)  13123200
6        usr    wm   20779 – 20780        1.88MB    (2/0/0)         3840
7 unassigned    wm   20781 – 36821       14.69GB    (16041/0/0) 30798720

The file systems can be mounted, but the file system on slice 7 will not show the larger partition size until the file system is extended.

# mount /dev/dsk/c3t0d61s3 /data3
# mount /dev/dsk/c3t0d61s4 /data4
# mount /dev/dsk/c3t0d61s5 /data5
# mount /dev/dsk/c3t0d61s7 /data7
# df -k
Filesystem            kbytes    used   avail capacity  Mounted on
/dev/dsk/c0t0d0s0    32992541 3194170 29468446    10%    /
/proc                      0       0       0     0%    /proc
mnttab                     0       0       0     0%    /etc/mnttab
fd                         0       0       0     0%    /dev/fd
swap                 2241456     104 2241352     1%    /var/run
dmpfs                2241352       0 2241352     0%    /dev/vx/dmp
dmpfs                2241352       0 2241352     0%    /dev/vx/rdmp
swap                 3316896 1075544 2241352    33%    /tmp
/dev/dsk/c3t0d61s3   6457709     131 6393001     1%    /data3
/dev/dsk/c3t0d61s4   6457709     131 6393001     1%    /data4
/dev/dsk/c3t0d61s5   6457709     131 6393001     1%    /data5
/dev/dsk/c3t0d61s7   6457709     131 6393001     1%    /data7

# /usr/lib/fs/ufs/mkfs -G -M /data7 /dev/rdsk/c3t0d61s7 30798720
/dev/rdsk/c3t0d61s7:    30798720 sectors in 16041 cylinders of 15 tracks, 128 sectors
15038.4MB in 315 cyl groups (51 c/g, 47.81MB/g, 6016 i/g)
super-block backups (for fsck -F ufs -o b=#) at:
32, 98080, 196128, 294176, 392224, 490272, 588320, 686368, 784416, 882464,
Initializing cylinder groups:
……
super-block backups for last 10 cylinder groups at:
29865760, 29963808, 30061856, 30159904, 30257952, 30356000, 30454048,
30552096, 30650144, 30748192,

The file system has been extended and the data is preserved.

# df -k
Filesystem            kbytes    used   avail capacity  Mounted on
/dev/dsk/c0t0d0s0    32992541 3194170 29468446    10%    /
/proc                      0       0       0     0%    /proc
mnttab                     0       0       0     0%    /etc/mnttab
fd                         0       0       0     0%    /dev/fd
swap                 2241392     104 2241288     1%    /var/run
dmpfs                2241288       0 2241288     0%    /dev/vx/dmp
dmpfs                2241288       0 2241288     0%    /dev/vx/rdmp
swap                 3316832 1075544 2241288    33%    /tmp
/dev/dsk/c3t0d61s3   6457709     131 6393001     1%    /data3
/dev/dsk/c3t0d61s4   6457709     131 6393001     1%    /data4
/dev/dsk/c3t0d61s5   6457709     131 6393001     1%    /data5
/dev/dsk/c3t0d61s7   15157419     131 15092711     1%    /data7

# ls /data7
arp.conf                 ip6.conf                 q3ip.conf                udp.conf
audiocs.conf             ipsecah.conf             qla2300.conf             udp6.conf
audioens.conf            ipsecesp.conf            ramdisk.conf             usb_ac.conf
…