--- On Thu, 19/5/11, Stan Hoeppner <stan@hardwarefreak.com> wrote:

From: Stan Hoeppner <redacted>
Subject: Re: Best way to create RAID-6 for swap partition - existing one failed
To: "Gavin Flower" <redacted>
Cc: linux-raid@vger.kernel.org, neilb@suse.de, mb@gem.win.co.nz
Date: Thursday, 19 May, 2011, 14:26
On 5/18/2011 7:11 PM, Gavin Flower
wrote:

We're getting pretty OT here...

quoted

What obvious thing have I done, or not done, here?

What should I do now?

(I am not panicking, because I can always revert

back...)

quoted

I tried to implement you suggestion, 

# swapoff -a
# dd if=/dev/zero of=/swapfile1 bs=1K count=16M
16777216+0 records in
16777216+0 records out
17179869184 bytes (17 GB) copied, 119.642 s, 144 MB/s
# mkswap /swapfile1
Setting up swapspace version 1, size = 16777212 KiB
no label, UUID=9afbf206-9a79-45b8-ad4b-148f71c440d7

17GB is a bit ridiculous for swap, especially on a single
user machine.

Strictly speaking, I should have used the recommended 10GB (2GB + RAM size) to allow for hibernation.

quoted

# swapon /swapfile1
# cp /etc/fstab /etc/fstab-20110519

in
/etc/fstab
I replaced
UUID=654f3b90-ed2c-4de6-9f2a-e2ad65fd1af1 swap 

               
  swap    defaults       
0 0

quoted

by
/swapfile1           

               
    swap           
        swap    defaults 
      0 0

quoted

The log message for the swapon was:
May 19 11:27:38 saturn kernel: [38075.451398] Adding

16777212k swap on /swapfile1.  Priority:-1 extents:159
across:24068092k 

Looks good.

quoted

However, it failed to hibernate.  The log

messages were:

quoted

May 19 11:44:43 saturn kernel: [39043.115385] sd

1:0:0:0: [sdb] Starting disk

quoted

May 19 11:44:43 saturn kernel: [39043.128453] sd

2:0:0:0: [sdc] Starting disk

quoted

May 19 11:44:43 saturn kernel: [39043.140116] sd

3:0:0:0: [sdd] Starting disk

quoted

May 19 11:44:43 saturn kernel: [39043.150889] sd

5:0:0:0: [sde] Starting disk

quoted

May 19 11:44:43 saturn kernel: [39043.165729] PM: thaw

of devices complete after 756.642 msecs

quoted

May 19 11:44:43 saturn kernel: [39043.322491] PM:

Saving image data pages (809839 pages) ... done

quoted

May 19 11:44:43 saturn kernel: [39094.461575] PM:

Wrote 3239356 kbytes in 51.13 seconds (63.35 MB/s)

quoted

May 19 11:44:43 saturn kernel: [39094.465739] PM: S
May 19 11:44:43 saturn kernel: [39094.482407] PM: Swap

header not found!

quoted

May 19 11:44:43 saturn kernel: [39094.485188] |
May 19 11:44:43 saturn kernel: [39094.706731]

Restarting tasks ... done.

quoted

May 19 11:44:43 saturn NetworkManager[1501]:

<info> wake requested (sleeping: yes  enabled:
yes)

quoted

May 19 11:44:43 saturn NetworkManager[1501]:

<info> waking up and re-enabling...

quoted

May 19 11:44:43 saturn NetworkManager[1501]:

<info> (eth0): now managed

I've never used hibernation, but a quick Google search
gives lots of
information on this.  Google "linux swap file
hibernate".  I read one
thread from 2008, in which folks easily solved this with a
kernel update
or switching the filesystem where they stored the swap
file.  I would
think 3 years later any bugs in the hibernation code have
been squashed
and this should work flawlessly.

What kernel/distro version are you running?  Anything
recent should be
able to handle hibernation to a swap file.

-- 
Stan

Hibernation mostly worked (almost all problems were associated with the Radeon video drivers) when I was using the RAID-6 swap partition.  So I was not anticipating any new problem with hibernations.

I am using Fedora 14 with all the latest patches applied.

$ uname -a
Linux saturn 2.6.35.13-91.fc14.x86_64 #1 SMP Tue May 3 13:23:06 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux


Cheers,
Gavin
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