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Increase root partition by moving starting cylinder

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Operating Systems Solaris Increase root partition by moving starting cylinder
# 1  
Old 03-16-2011
Increase root partition by moving starting cylinder
I am trying to expand the root partition on Solaris 10. I can expand root partition using format/partition command, but usually increasing cylinders on partition is done on back end. In this case I would have to expand from the front end following the table below, meaning I would have to move the starting cylinder. My concern is if moving the starting cylinder of root will cause some problems with Solaris. Cylinders 526-54422 seem to unallocated and should be able to use. I was thinking if I can move the starting cylinder and increase it then I can use growfs command on root partition to expand the size.


Code:
Current partition table (original):
Total disk cylinders available: 60797 + 2 (reserved cylinders)

Part      Tag    Flag     Cylinders         Size            Blocks
  0       root    wm   54423 - 60796       48.83GB    (6374/0/0)  102398310
  1       swap    wu       3 -   525        4.01GB    (523/0/0)     8401995
  2     backup    wm       0 - 60796      465.73GB    (60797/0/0) 976703805
  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
  8       boot    wu       0 -     0        7.84MB    (1/0/0)         16065
  9 alternates    wu       1 -     2       15.69MB    (2/0/0)         32130

I guess my main question is if moving starting cylinder of my root partition be harmful to the system even though I have plenty of unallocated space to use.
Last edited by pludi; 03-16-2011 at 04:44 PM..
# 2  
Old 03-16-2011
The man page for growfs states:
Code:
                                               The following con-
     ditions  prevent  you from expanding file systems: When acct
     is activated and the accounting file is on the  target  dev-
     ice.  When  C2 security is activated and the logging file is
     on the target file system. When there is a local  swap  file
     in the target file system. When the file system is root (/),
     /usr, or swap.

Since you are talking about root, I think you're in trouble right there. But growfs is for ufs filesystems. I assume you have a ufs root? If it's zfs then I will have to defer to someone else. I have never used zfs.
# 3  
Old 03-16-2011
Yes, it is ufs root. I've only created slices or partitions on a device, but it would seem that expanding the root and using growfs would be a solution only if moving the starting root partition was valid option. I've read others successfully doing so, but my situation may be different. If all else I guess I could just make another slice of a partition, but then that would require me to move directories/files over and renaming.
# 4  
Old 03-16-2011
I think you can create a new partition on that disk and do a live upgrade that uses the new partition as its root disk.

Code:
man live_upgrade

# 5  
Old 03-17-2011
Perhaps adding a slice and creating a new partition mount might be the safer alternative. I was hoping to expand root, but not at the risk of jeapordizing the system. Seems like a waste of space that is not used just sitting there.
# 6  
Old 03-17-2011
how about a backup of your system with a flasharchive and a "new" install from the flasharchive with a new filesystem layout?
# 7  
Old 03-17-2011
Quote:
Originally Posted by mjaminal
I was thinking if I can move the starting cylinder and increase it then I can use growfs command on root partition to expand the size.
This won't work as growfs can only expand a file system if space is added at the end of it, not before.
As you have plenty of free space available, you can simply create a ~400 GB slice 3, then dump/restore slice 0 to it, then make s3 your boot partition.
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