Resizing the partition table

Hi Guys,
I got 800G Volume from Equallogic on Solaris 10. It was created with newfs -T but now I have to expand it to 1.5 TB but somehow Solaris is not getting right
LUN geometry size. Any comments/suggestions ?
It is shrinking the size to 136.02 GB rather than expanding to 1.5TB
Mode sense page(3) reports nsect value as 3000, adjusting it to -1096
Please help me to solve this.
Here are my steps
Expand LUN size from 800G to 1.5 TB on Equallogic
umount /san/users on Solaris
bash-3.00# format
Searching for disks...done
AVAILABLE DISK SELECTIONS:
0. c0t0d0 <SUN146G cyl 14087 alt 2 hd 24 sec 848>
/pci@1e,600000/pci@0/pci@a/pci@0/pci@8/scsi@1/sd@0,0
1. c0t1d0 <SUN146G cyl 14087 alt 2 hd 24 sec 848>
/pci@1e,600000/pci@0/pci@a/pci@0/pci@8/scsi@1/sd@1,0
2. c1t6090A038105649B7A7A0F4324C81EE5Bd0 <EQLOGIC-100E-00-4.0 cyl 65533 alt 2 hd 16 sec 1600>
/scsi_vhci/ssd@g6090a038105649b7a7a0f4324c81ee5b
Specify disk (enter its number): 2
selecting c1t6090A038105649B7A7A0F4324C81EE5Bd0
[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> t
Mode sense page(3) reports nsect value as 3000, adjusting it to -1096
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. Peerless 10GB
19. SUN146G
20. EQLOGIC-100E-00-4.0
21. other
Specify disk type (enter its number)[20]: 0
Mode sense page(3) reports nsect value as 3000, adjusting it to -1096
c1t6090A038105649B7A7A0F4324C81EE5Bd0: configured with capacity of 136.02GB
<EQLOGIC-100E-00-4.0 cyl 8608 alt 2 hd 16 sec 64440>
selecting c1t6090A038105649B7A7A0F4324C81EE5Bd0
[disk formatted]
Thanks,
Farhan

I think Andreas is referring to fdisk partition 2, not slice 2, as his first image
indicates.
It sounds like Andreas was able to expand the size of fdisk partition 1 while
booting from Live media without corrupting his root file system, if I'm reading
this correctly. This probably worked because the new partition 1 started in
the same location.
In general, I wouldn't recommend this approach. Its like pulling the tablecloth
and expecting the glass and silverware to remain in tact.
However, I see some s11 enhancements that might make this more doable
so I need to investigate.
Alternative approaches are to attach a larger (spare) disk and detach the smaller
disk.
Thanks,
Cindy

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Hello, I am trying to upgrade to yosemite, but I get the "disk cannot be used to startup your computer" error. Resizing the partition does not work, I get the error "MediaKit reports no such partition" probably because I installed linux in dual boot

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As usual, the Linux installer wrecked the partition table. You would have to boot from your OS X installation disc and repartition. Doing so will of course remove all data from the drive, so you must back up first if you haven't already done so.

Tag Values in the partition Table

I get the following information when I use format to print the partition table:
Part Tag Flag Cylinders Size Blocks
0 root wm 0 - 25 129.19MB (26/0/0) 264576
1 swap wu 26 - 51 129.19MB (26/0/0) 264576
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3 unassigned wm 0 0 (0/0/0) 0
4 unassigned wm 0 0 (0/0/0) 0
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7 unassigned wm 0 0 (0/0/0) 0
I know the possible tag values are unassigned, boot, root, swap, usr, backup, var, home, reserved. However, what does each of these tag value mean? If I assign a tag value of var to a partition does that mean I have to use that partition as a /var?
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answer #1 - man -s 1m prtvtoc
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Modify the partition table

Hi,
Please let me know how to modify the partition table of the disk on to which root is mounted. I want to extend the root space, by modifying the partition table.
Is there any other way of extending the root disk space?
Thanks in Advance
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Take backup, re-partition, newfs, restore (you are talking about simple root, no mirroring/veritas, right?)

Resizing the partition

Hi All,
How can i resizing the partition in RHEL 4U4.
Thanks.

good notes:
445215.1:How to resize an EXT3 filesystem
249354.1:HowTo Resize a Filesystem on Linux

Resize the Partition

Hi,
o/s Linux redhat 5 32bit
i need to resize my partiition to add some space
[root@data ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/hda1 19G 18G 783M 96% /
/dev/hda5 77G 72G 873M 99% /oracle
/dev/hda2 48G 222M 45G 1% /backup
tmpfs 2.0G 0 2.0G 0% /dev/shm
I need to get some space from /backup volume and add to /oracle volume
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Working with partition tables can be destructive. Whatever you do, make a backup of all data first.
You may want to check into LVM, which comes free with Linux and is standard. The basic idea is that you can add LVM controlled disks and partitions to an existing LVM partition and thereby increase its size. The constructed partitions will appear as one volume from the OS level. You can also convert non LVM disks to LVM without loosing the data.
There is plenty of documentation and tutorials available when you search with Google using e.g. "redhat linux lvm tutorial" and "linux lvm convert disk".

Is it possible to resize the partitions without losing data?

I have following issue:
I have dual-boot Arch with Windows XP. I created 4 partitions: 40GB XP's system disk (ntfs), 80GB ntfs data disk, 1GB swap and 25GB Linux partition.
But I am running XP so rarely, that it is frustrating, that I have most of my data on ntfs partition... I'd like to wipe out that 80GB ntfs, resize the system ntfs partition up to for example 60GB, and add the remaining 60GB to my linux ext3 partition (because I'm running out of free space recently...).
Has anyone done something like this, and how safe it is (if possible at all)
Yes, I have read this: http://wiki.archlinux.org/index.php/Res … _partition, and a few more.
I just don't have time to reinstall both systems (especially I would not like to install Windows, because I'd rather install Vista from my recovery disk, than hack the XP to work again...), and if some issues are likely to appear, then I'll give it up for now .

It's trivial using gparted, but as with any similar operation, you run the risk of losing data - so you'd better backup.

Cannot resize the partition C

Hi,
I have a problem with resizing my partition C on Windows 8.1. It only has 28 GB and I have run out of every space. The Disc manager for resizing partitions is not working (every option for a Disc C is greyed out). I downloaded three partition managers: Paragon,
Aomei and one more (don't remember the name, cause I deleted it already). All of them were supported by Windows 8.1 32 bit. And still it was not possible to do anything with the disk C, even though I have a lot of unallocated space to use.
I also deleted disk D, so that only Disk C was left, and still I couldn't allocate any space to it, only to shrink it.
Can anyone tell me what else can I do?
It is driving me crazy already. Help please.
Marta

Hello,
I used aomei partition assistant before in my windows 8.1, it worked well. do you use "resize partition" in aomei partition assistant to extend you c drive? if you do like this, the unallocated space on your hard disk should be contiguous behind
the partition c, or you can't extend partition. but if the unallocated space is not contigous behind partition c, you an use extend partition wizard or merge partitions to extend partitionc
extend partition wizard: http://www.disk-partition.com/windows-8/change-partition-size-windows-8.html
merge partitions: http://www.disk-partition.com/help/merge-partition.html
hope can help you

Upgraded harddrive from a failing drive, can't resize the partition

I have an iMac (27 inch). I upgraded my HDD 1TB drive to a 3TB drive because my original drive was failing. I used a stand alone drive cloner (Bytecc BT-340) and after 8+ hours (because of the bad harddrive) I was able to copy the drive.
I had a bootcamp partition and I attempted to boot into windows, the computer hung up indefinitely. Upon reboot the computer would give me a progress bar under the apple logo, it would make some progress, then the computer will shut off.
I made a 2nd attempt at recovering the hard drive info successfully from the original 1TB back into the 3TB. My First step after that was to delete the bootcamp partition to make sure I wouldn't repeat the problem again. Now I can't seem to resize my 750GB partition for my 3TB harddrive. I get a message "Media Kit Reports Partition too small".
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Here's your only way out. Create a new partition in the free space. Use Disk Utility, Carbon Copy Cloner, or SuperDuper! to clone your current volume to the new, empty partition. Then verify everything is OK, delete the bottom partition and expand the remaining one.
Your alternative is to buy iPartition 3.3.1 which can handle the problem - $45.00.

Can I change some partitions of the partitioned table read-only?

I have a table partitioned by range( partitioned hourly).
I want to keep the history data online for query (the history data is rarely accessd). But in this way the table is too large. The performance may be a big problem. So some problems may be raised:
How can I change the aged partition read-only?
How to decrease the workload on this table and improve the performance?
Oracle 10g (10.2.0.3)+Solaris 10

How can I change the aged partition read-only?In 10.2.x.x I think only tablespaces can be made read only.
In 11g you can place tables in read only mode, but I don't know about specific partitions.

Windows installer not booting up after resizing the partition

Hello.
I am trying to reinstalling Windows 8.1. pro on my macbook with Yosemite.
When I initially installed Windows, it went fine, but Windows corrupted my booting process.
So I tried to fix it with gdisk command to create hybrid mbr, but I was not able to fix the problem.
So I deleted the Boot Camp partition using Boot Camp Assistant.
then I created a new Boot Camp partition through Boot Camp Assistant.
However, Windows installer did not boot up automatically nor manually(pressing option whilst booting) anymore.
I have booted up Windows installer using the same usb on pc, so I know that the usb containing Windows installer does work..
I am not sure how to boot the Windows installer.
Do I have to do clean install the OS X??
thank you for your help and time in advance.
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Is it possible to create the disk using BCA and a Windows ISO on the Mac, if your Mac supports it? If your Mac has a built-in Optical drive (or used to have one), you are going to run into issues.
Can you
1. Run Disk Utility Repair.
2. SMC Reset - Intel-based Macs: Resetting the System Management Controller (SMC) - Apple Support
3. PRAM Reset - OS X Yosemite: Reset your computer’s PRAM
You can also look at Bootcamp Windows 7 Install Problem.

Can I use gpt to recreate/unerase a partition table? (Rebuild the GPT/GUID partition table?) I don't want to do FILE recovery.

(Yes, I've googled a bunch and read threads like this one already.)
Can I use gpt or some other app to recreate/unerase a partition table? That is, how can I rebuild a disk's GPT/GUID partition table?) I don't want to do FILE recovery.
What happened: Instead of erasing a single partition off a disk with many partitions, the entire partition table was erased (using Disk Utility, w/o deleting the underlying files). Somehow the "Erasing a disk deletes all data on all its partitions." warning message was missed.
I have a copy of the output of df, with the number of blocks in each partition, from just prior to the erasure, so I should be able to recreate the GPT/GUID partition table. Editing the GPT with a hex editor is not feasible. Simply recreating the partitions with Disk Utility will overwrite the key filesystem tables on each partition, and I don't want to do that, plus Disk Utility doesn't allow me to specify exact partition sizes anyway.
Surely there's an app for rebuilding the partition table (other than emacs' hexl-mode!) for recreating/unerasing a partition table when the partition sizes and orders are known? I've looked at the advertising for a bunch of recovery software and none of them clearly indicate that they will do what I want.
I guess I can try using gpt on a copy of the reformatted drive I've made with dd, and see what happens. But perhaps someone knows of a tool that should do what I need, or knows if gpt is that tool or not.
There are answers and tools that will do FILE recovery - search for files and recover the ones that aren't fragmented or deleted. As far as I can find, they just look for files on the disk, and don't pay much, if any attention to the filesystem info or directory heirarchy, which in this case is valuable. Of course I could send it in to DriveSavers, or the like. But none of that seems necessary, and the scavenging file recovery apps won't do the job well,
E.g. some are mentioned here:
I don't want to do FILE recovery.
Thanks for any help.
The links in this post are to pages describing the underlined term, e.g. the man pages for df and gpt.
dd output includes:
Filesystem
512-blocks
Used Available Capacity Mounted on

Aperture has the ability to work with files in their existing location. They are called "referenced masters." When you import images, you should select the "In their current location" in the "Store Files:" drop down box. Have a read of the documentation for full specifics. Unsure how you can resolve your duplication; might be some work but next time have a read of the manual first
Information for versions is stored in the Aperture database (library file). The masters can be inside the library file itself, or they can be somewhere else.

Datapump skipping partitioned tables in the database

I have run expdp on Oracle 10.2.0.4.0 on AIX 5.6 Platform, the export runs well exporting rows in the database but when it comes to partitioned tables in the database it export no rows for all the partitioned tables. When I run a normal exp/imp the partitioned tables are exported with all their rows.
I used the following commands:
expdp system/****** dumpfile=export_data.dmp directory=DATA_PUMP_DIR full=y logfile=export_dump.log
Output for expdp on partitioned table:
. . exported "SCOTT"."DEPT":"DEPT_2003_P1" 0 KB 0 rows
. . exported "SCOTT"."DEPT":"DEPT_2003_P10" 0 KB 0 rows
. . exported "SCOTT"."DEPT":"DEPT_2003_P11" 0 KB 0 rows
. . exported "SCOTT"."DEPT":"DEPT_2003_P12" 0 KB 0 rows
. . exported "SCOTT"."DEPT":"DEPT_2003_P2" 0 KB 0 rows
. . exported "SCOTT"."DEPT":"DEPT_2003_P3" 0 KB 0 rows
. . exported "SCOTT"."DEPT":"DEPT_2003_P4" 0 KB 0 rows
. . exported "SCOTT"."DEPT":"DEPT_2003_P5" 0 KB 0 rows
. . exported "SCOTT"."DEPT":"DEPT_2003_P6" 0 KB 0 rows
. . exported "SCOTT"."DEPT":"DEPT_2003_P7" 0 KB 0 rows
. . exported "SCOTT"."DEPT":"DEPT_2003_P8" 0 KB 0 rows
. . exported "SCOTT"."DEPT":"DEPT_2003_P9" 0 KB 0 rows
And for exp:
exp system/****** file=export_dump.dmp full=y log=export_log1.log
Result from the export log for partitioned tables:
. . exporting partition DEPT_2005_P1 881080 rows exported
. . exporting partition DEPT_2005_P2 1347780 rows exported
. . exporting partition DEPT_2005_P3 2002962 rows exported
. . exporting partition DEPT_2005_P4 2318227 rows exported
. . exporting partition DEPT_2005_P5 3122371 rows exported
. . exporting partition DEPT_2005_P6 3916020 rows exported
. . exporting partition DEPT_2005_P7 4217100 rows exported
. . exporting partition DEPT_2005_P8 4125915 rows exported
. . exporting partition DEPT_2005_P9 1913970 rows exported
. . exporting partition DEPT_2005_P10 1100156 rows exported
. . exporting partition DEPT_2005_P11 786516 rows exported
. . exporting partition DEPT_2005_P12 822976 rows exported
I am not sure about this behavour from datapump, my database is more than 800GB and we want to migrate the database from AIX to LINUX.
Thanks

Sorry I just copied and pasted some extracts from my exp and expdp logs:
For testing purposes I tried to run a datapump export of only 1 partitioned table in the database and its going through, but when I do the same on a full datapump export these partitioned tables are being exported with no rows.
Export: Release 10.2.0.4.0 - 64bit Production on Tuesday, 02 August, 2011 12:18:47
Copyright (c) 2003, 2007, Oracle. All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Starting "SYSTEM"."SYS_EXPORT_TABLE_01": system/******** dumpfile=DEPT.dmp tables=scott.dept logfile=dept1.log
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 48.50 GB
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/GRANT/OWNER_GRANT/OBJECT_GRANT
Processing object type TABLE_EXPORT/TABLE/INDEX/INDEX
Processing object type TABLE_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
Processing object type TABLE_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type TABLE_EXPORT/TABLE/COMMENT
Processing object type TABLE_EXPORT/TABLE/RLS_POLICY
Processing object type TABLE_EXPORT/TABLE/CONSTRAINT/REF_CONSTRAINT
Processing object type TABLE_EXPORT/TABLE/TRIGGER
Processing object type TABLE_EXPORT/TABLE/INDEX/FUNCTIONAL_AND_BITMAP/INDEX
Processing object type TABLE_EXPORT/TABLE/INDEX/STATISTICS/FUNCTIONAL_AND_BITMAP/INDEX_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
. . exported "SCOTT"."DEPT":"DEPT_2009_P6" 1.452 GB 7377736 rows
. . exported "SCOTT"."DEPT":"DEPT_2009_P7" 1.363 GB 6935687 rows
. . exported "SCOTT"."DEPT":"DEPT_2008_P6" 1.304 GB 6656096 rows
. . exported "SCOTT"."DEPT":"DEPT_2010_P7" 1.410 GB 7300618 rows
. . exported "SCOTT"."DEPT":"DEPT_2008_P7" 1.296 GB 6641073 rows
. . exported "SCOTT"."DEPT":"DEPT_2010_P6" 1.328 GB 6863885 rows
. . exported "SCOTT"."DEPT":"DEPT_2007_P6" 1.158 GB 6568075 rows
. . exported "SCOTT"."DEPT":"DEPT_2009_P5" 1.141 GB 5801822 rows
. . exported "SCOTT"."DEPT":"DEPT_2011_P5" 1.162 GB 6027466 rows
. . exported "SCOTT"."DEPT":"DEPT_2007_P7" 1.100 GB 6214680 rows
. . exported "SCOTT"."DEPT":"DEPT_2011_P6" 1.106 GB 5762303 rows
. . exported "SCOTT"."DEPT":"DEPT_2010_P5" 1.133 GB 5859492 rows
. . exported "SCOTT"."DEPT":"DEPT_2007_P5" 1.001 GB 5664315 rows
. . exported "SCOTT"."DEPT":"DEPT_2008_P5" 1.023 GB 5229356 rows
. . exported "SCOTT"."DEPT":"DEPT_2010_P8" 1.078 GB 5549666 rows
. . exported "SCOTT"."DEPT":"DEPT_2007_P8" 940.3 MB 5171379 rows
. . exported "SCOTT"."DEPT":"DEPT_2008_P8" 989.0 MB 4920276 rows
. . exported "SCOTT"."DEPT":"DEPT_2009_P8" 918.6 MB 4553523 rows
. . exported "SCOTT"."DEPT":"DEPT_2006_P6" 821.0 MB 5220879 rows
. . exported "SCOTT"."DEPT":"DEPT_2008_P4" 766.6 MB 3832262 rows
. . exported "SCOTT"."DEPT":"DEPT_2006_P8" 747.9 MB 4753538 rows
. . exported "SCOTT"."DEPT":"DEPT_2006_P7" 741.8 MB 4708242 rows
. . exported "SCOTT"."DEPT":"DEPT_2010_P4" 734.2 MB 3713567 rows
. . exported "SCOTT"."DEPT":"DEPT_2005_P7" 661.4 MB 4217100 rows
. . exported "SCOTT"."DEPT":"DEPT_2005_P8" 647.1 MB 4125915 rows
. . exported "SCOTT"."DEPT":"DEPT_2011_P4" 677.8 MB 3428887 rows
I also tried to run a normal schema by schema export with the normal exp system/password command the and got my dump file which is about 300GB, when I run the imp system/password command and specify fromuser=<system > and touser=<schemas_in_the_dumpfile> seperated by commas, it just comes up with this message:
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export file created by EXPORT:V10.02.01 via conventional path
import done in WE8ISO8859P9 character set and AL16UTF16 NCHAR character set
Import terminated successfully without warnings.
No tables are exported.
If I specify the parameter imp system/password file=dept_export.dmp full=y log=dept_imp.log with the same dumpfile and it imports data from the dumpfile into my database.
I am not sure what could be wrong with my dumpfile or my imp command and its parameters.

How to choose the partition in oracle tables?

Dear all,
i m in need to create the partitions on prod.db tables since i m not aware of creating partitions?i just go through some theroy concepts and understood the range and list partitions (i.e)Range is normally used for values less than like jan,feb,march or values less than 50,000 values less than 1,00,000 like that each partition is having separate tablespaces to increase the performance. and for list is used to denoting the directions like west,east,north,south like that.
Now what i want to know is ?
1.)when will i can go ahead with partitions?
2.)before creating partitions is it advise to create index or not needed?
3.)if i started to create partition what is the leading column have to create partition and which partition has to choose?
pls let me know and pardon me if i did any mistakes.
thanks in advance..

I had to research on same topic. One of my teammates suggested few points that might help you also.
Advantages of partitioning:
1) Partitioning enables data management operations such data loads, index creation and rebuilding, and backup/recovery at the partition level, rather than on the entire table. This results in significantly reduced times for these operations.
2) Partitioning improves query performance. In some cases, the results of a query can be achieved by accessing a subset of partitions, rather than the entire table. Parallel queries/DML and Partition-wise Joins are also got benefited much.
3) Partitioning increases the availability of mission-critical databases if critical tables and indexes are divided into partitions to reduce the maintenance windows, recovery times, and impact of failures. (Each partition can have separate physical attributes such as pctfree, pctused, and tablespaces.)
Partitioning can be implemented without requiring any modifications to your applications. For example, you could convert a nonpartitioned table to a partitioned table without needing to modify any of the SELECT statements or DML statements which access that table. You do not need to rewrite your application code to take advantage of partitioning.
Disadvantages of partitioning:-
1) Advantages of partition nullified when you use bind variables.
Additional administration tasks to manage partitions viz. If situation arises for rebuilding of index then rebuilding should to be done for each individual partition.
2) Need more space to implement partitioning objects.
3) More time for some tasks, such as create non-partitioning indexes, collection of “global" statistics (dbms_stat’s granularity parameter to be set to GLOBAL. if sub partition are used then we have to set it to ALL).
4) Partition would implies a modification (of explain plan) for ALL the queries against the partitioned tables. So, if some queries use the choosing partition key and may greatly improve, some other queries not use the partition key and are dramatically bad impact by the partitioning.
5) To get the full advantage of partitioning (partition pruning, partition-wise joins, and so on), you must use the Cost Based Optimizer (CBO). If you use the RBO, and a table in the query is partitioned, Oracle kicks in the CBO while optimizing it. But because the statistics are not present, the CBO makes up the statistics, and this could lead to severely expensive optimization plans and extremely poor performance.
Message was edited by:
Abou

This disk doesn't use the GUID Partition table scheme.

When I Install the Lion. It is stuck.
Lion This disk doesn’t use the GUID Partition table scheme.Use disk Utility to change the partition scheme.Select the disk,choose the Partition tab,select the Volume Scheme and then click Options.
The last step has problem.
I can not click Options.

In order to repartition the startup drive you will have to boot from your Snow Leopard DVD, select Utilities and then Disk Utility. YOU MUST ERASE YOUR DISK TO CHANGE THE PARTITION TABLE. The good news is that I see you have a Time Machine backup. Make sure that your backup is current before you erase your startup disk.
Even before doing this, save a copy of the Lion installer (it is in the Applications folder) onto an external device. Your external hard drive is a good spot; it won't interfere with your Time Machine backup. This will prevent you from having to download the installer again.
The easiest way to proceed after making sure your Time Machine backup is current, saving a copy of the Lion installer, and repartitioning your startup disk, is to reinstall Snow Leopard on your newly partitioned disk. This will take a little longer but it is simple and is fully supported by Apple. Once that is done and you are running Snow Leopard on your startup disk again, run the Lion installer from whereever you saved it, and then restore your files and settings from your Time Machine backup during the install process.
There is an unsupported procedure for making a bootable Lion DVD, but it is more complex and is not supported by Apple. If you are uncomfortable with any of this and have access to an Apple Store, make an appointment at the Genius Bar and they can help you through the process.

Resizing the partition table

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