[Starcluster] enlarge volume

[Austin Godber]

Alright, I have it running, here's the short version, commands only, no 
output, run as root, disk is attached at /dev/sdf with one partition:


Check the filesystem (might want to use -f to force a real check)
# fsck /dev/sdf1

Repartition with sfdisk, start at the first cylinder end at the last
# echo ",,L" | sfdisk /dev/sdf

Resize the ext3 filesystem
# resize2fs /dev/sdf1

Recheck the filesystem
# fsck -f /dev/sdf1

Now mount and check that the data is there and the size is correct with 
df -h.

Let me know if it works for you.

- Austin

Here is my verbose version, with output.

# fsck /dev/sdf1
fsck from util-linux-ng 2.16
e2fsck 1.41.9 (22-Aug-2009)
/dev/sdf1: clean, 11/196608 files, 29901/785176 blocks

# sfdisk -l /dev/sdf

Disk /dev/sdf: 652 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

    Device Boot Start     End   #cyls    #blocks   Id  System
/dev/sdf1          0+    390     391-   3140707   83  Linux
/dev/sdf2          0       -       0          0    0  Empty
/dev/sdf3          0       -       0          0    0  Empty
/dev/sdf4          0       -       0          0    0  Empty


# echo ",,L" | sfdisk /dev/sdf
Checking that no-one is using this disk right now ...
OK

Disk /dev/sdf: 652 cylinders, 255 heads, 63 sectors/track
Old situation:
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

    Device Boot Start     End   #cyls    #blocks   Id  System
/dev/sdf1          0+    390     391-   3140707   83  Linux
/dev/sdf2          0       -       0          0    0  Empty
/dev/sdf3          0       -       0          0    0  Empty
/dev/sdf4          0       -       0          0    0  Empty
New situation:
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

    Device Boot Start     End   #cyls    #blocks   Id  System
/dev/sdf1          0+    651     652-   5237189+  83  Linux
/dev/sdf2          0       -       0          0    0  Empty
/dev/sdf3          0       -       0          0    0  Empty
/dev/sdf4          0       -       0          0    0  Empty
Warning: no primary partition is marked bootable (active)
This does not matter for LILO, but the DOS MBR will not boot this disk.
Successfully wrote the new partition table

Re-reading the partition table ...

If you created or changed a DOS partition, /dev/foo7, say, then use dd(1)
to zero the first 512 bytes:  dd if=/dev/zero of=/dev/foo7 bs=512 count=1
(See fdisk(8).)


# resize2fs /dev/sdf1
resize2fs 1.41.9 (22-Aug-2009)
Resizing the filesystem on /dev/sdf1 to 1309297 (4k) blocks.
The filesystem on /dev/sdf1 is now 1309297 blocks long.

# fsck -f /dev/sdf1
fsck from util-linux-ng 2.16
e2fsck 1.41.9 (22-Aug-2009)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/sdf1: 11/327680 files (0.0% non-contiguous), 38511/1309297 blocks






On 08/12/2010 08:01 PM, Dan Yamins wrote:
> Let me add one more thing to this thread:
>
> Even on ubuntu, even with my original volume, you can't do "e2fsck" of 
> the "device" , e.g.
>
> $ e2fsck /dev/sdz
> Couldn't find ext2 superblock, trying backup blocks...
> e2fsck: Bad magic number in super-block while trying to open /dev/sdo
> ...
>
> Is that to be expected?  In a number of tutorials on resizing EBS 
> volumes, i have seen this done with the devices itself.  Is the reason 
> this is failing because its a partitioned drive?
>
>
>
> On Thu, Aug 12, 2010 at 6:43 PM, Dan Yamins <dyamins at gmail.com 
> <mailto:dyamins at gmail.com>> wrote:
>
>
>>>                 Do you have a snapshot?  I have used parted and
>>>                 e2resizefs to expand an ext3 filesystem without trouble.
>>>
>>>
>
>
>     So I'm trying parted on a new, clean volume created from the
>     snapshot, attached to /dev/sdm  As I explained before, I can't do
>
>     $ parted /dev/sdm
>     [root at domU-12-31-39-0E-B2-61 ~]# parted /dev/sdm
>     Error: Error initialising SCSI device /dev/sdm - Invalid argument
>
>     AUstin, when you did this did you get that same error?
>
>
>     I /CAN/ do parted on the path:
>
>     $ parted /dev/sdm1
>     GNU Parted 1.8.1
>     Using /dev/sdm1
>     Welcome to GNU Parted! Type 'help' to view a list of commands.
>
>     But then i get this error:
>
>     (parted) resize 1 0 500GB
>     Error: The location 500GB is outside of the device /dev/sdo1.
>
>     Which is course is true ...
>
>     (parted) print
>     Disk /dev/sdm1: 21.5GB
>     Sector size (logical/physical): 512B/512B
>     Partition Table: loop
>
>     Number  Start   End     Size    File system  Flags
>      1      0.00kB  21.5GB  21.5GB  ext3
>
>
>     So I'm not sure where to go from here...
>
>     Dan
>
>
>
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