[ale] what should I do when resizing ext4 partition

Tue Jun 11 14:38:37 EDT 2013

Hi Jim,

EEEK!  I had forgotten that Linux uses the swap space for hibernation!  Windows uses its own separate swap and hibernation files.  I do want the pc to be able to hibernate if the battery (if applicable) gets weak.  I may have to think about growing that swap partition a bit.  AARG!

Ron

Jim Kinney <jim.kinney at gmail.com> wrote:

>I use LVM for all but /boot. So swap is a logical partition. That way I
>can
>tune the size of it as required.
>
>Additionally, for laptops, I can encrypt the entire PVM so swap is also
>encrypted for situations where the laptop hibernates.
>
>I have found that hibernations requires 1+X RAM for proper use. Not
>much
>more than 1X but enough to fully write out all of RAM plus a tiny bit
>extra
>used to tell the kernel to restore from swap. That will change if swap
>is
>actually used for a long-running process. 1.2 - 1.5 X RAM seems fair.
>Hard
>drives are cheaper than RAM anyway :-)
>
>
>On Tue, Jun 11, 2013 at 10:57 AM, Ron Frazier (ALE) <
>atllinuxenthinfo at techstarship.com> wrote:
>
>> Hi guys,
>>
>> Thanks for these tips.  With all the partition resizing and uuid
>changing,
>> I didn't know how radical to get rebuilding the swap partition.  The
>system
>> is running now, but, if the need arises again, I'll probably try the
>> commands you listed.
>>
>> I know it's been mentioned before to some extent, but could you (or
>> anyone) comment on the virtues of using a swap partition versus using
>a
>> swap file.  Windows uses a swap file.  Years ago I had Ubuntu running
>with
>> a swap file using a procedure I found online.  When I installed Mint
>> recently, I set up a swap partition just because it's easier.  These
>days,
>> I generally set the swap space as 1X RAM on Linux and 2X RAM on
>Windows.
>>  If I have the money, I try to put 8 GB of RAM in right off the bat. 
>That
>> gives the system lots of breathing room.  The one big advantage of a
>swap
>> file, versus a swap partition, is that it's much easier to expand it
>later.
>>
>> Sincerely,
>>
>> Ron
>>
>>
>>
>> On 6/11/2013 10:01 AM, Chuck Payne wrote:
>>
>>> Ron,
>>>
>>> I would do as Derek said, just do a mkswap, I have done on systems
>>> where I dropped the old swap and created a new one that was a bit
>>> bigger.
>>>
>>> Just make do the following
>>>
>>> swapoff
>>>
>>> del or resize the old swap
>>>
>>> mkswap /dev/partition of the swap
>>>
>>> swapon
>>>
>>> Update fstab if you delete it and created a new one.
>>>
>>>
>>>
>>> On Tue, Jun 11, 2013 at 9:43 AM, Derek Atkins<warlord at mit.edu> 
>wrote:
>>>
>>>
>>>> "Ron Frazier
>(ALE)"<atllinuxenthinfo@**techstarship.com<atllinuxenthinfo at techstarship.com>>
>>>>  writes:
>>>>
>>>>
>>>>
>>>>> On the Linux side of the fence, the boot loader was indeed broken.
> I
>>>>> used the Ubuntu boot repair disc which rebuilt grub for me.  Mint
>then
>>>>> booted fine, but the swap partition was not active according to
>system
>>>>> monitor.  I used gparted to delete and recreate the swap
>partition,
>>>>> then rebooted.  The swap was still not active.  I looked at the
>>>>> /etc/fstab file and found in the comments that you can use blkid
>to
>>>>> read the UUID of each partition.  I also found that the UUID was
>wrong
>>>>> for both the / partition and the swap.  I'm not sure how the
>system
>>>>> booted in this case, but I'm not complaining.  I changed the UUID
>for
>>>>> both entries in the fstab file to the correct number for the / and
>>>>> swap partitions respectively and rebooted again.  This time, the
>swap
>>>>> partition was working.
>>>>>
>>>>>
>>>> Ah, most likely the was Acronis did it was to actually mkfs new
>>>> filesystems on the new drive, which generated new UUIDs, instead of
>>>> doing a 'dd' and then fs-resize.  That would explain the UUID
>changes.
>>>>
>>>> As for the swap, depending on what acronis did you might just need
>to
>>>> "mkswap" to re-initialize the swap partition.  You shouldn't need
>to
>>>> erase and recreate the partition..
>>>>
>>>> -derek
>>>>
>>>> --
>>>>         Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
>>>>         Member, MIT Student Information Processing Board  (SIPB)
>>>>         URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
>>>>         warlord at MIT.EDU                        PGP key available
>>>>
>>>>
>>>>
>>>
>> --
>>
>> (PS - If you email me and don't get a quick response, you might want
>to
>> call on the phone.  I get about 300 emails per day from alternate
>energy
>> mailing lists and such.  I don't always see new email messages very
>> quickly.)
>>
>> Ron Frazier
>> 770-205-9422 (O)   Leave a message.
>> linuxdude AT techstarship.com
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>
>
>-- 
>-- 
>James P. Kinney III
>*
>*Every time you stop a school, you will have to build a jail. What you
>gain
>at one end you lose at the other. It's like feeding a dog on his own
>tail.
>It won't fatten the dog.
>- Speech 11/23/1900 Mark Twain
>*
>http://electjimkinney.org
>http://heretothereideas.blogspot.com/
>*
>
>
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--

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Please excuse my potential brevity if I'm typing on the touch screen.

(PS - If you email me and don't get a quick response, you might want to
call on the phone.  I get about 300 emails per day from alternate energy
mailing lists and such.  I don't always see new email messages very quickly.)

Ron Frazier
770-205-9422 (O)   Leave a message.
linuxdude AT techstarship.com
Litecoin: LZzAJu9rZEWzALxDhAHnWLRvybVAVgwTh3
Bitcoin: 15s3aLVsxm8EuQvT8gUDw3RWqvuY9hPGUU