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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi David,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I’m picking this up from Joe. I’ll attempt to answer your
questions.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The underlying device was grown from 89TB to 100TB. The xfs
filesystem utilizes an external logdev. After the underlying device was grown
by approx 11TB, we ran xfs_growfs –d <filesystem_mount_point>. This
command completed without errors, but the filesystem immediately went into a
bad state.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>We are running xfsprogs-2.8.20-1.el5.centos on RHEL Kernel Linux
2.6.18-53.1.19.el5 #1 SMP Tue Apr 22 03:01:10 EDT 2008 x86_64 x86_64 x86_64
GNU/Linux<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>We killed the xfs_repair before it was able to find a secondary superblock
and make things worse.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Currently the underlying block device is:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>--- Logical volume ---<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> LV Name /dev/logfs-sessions/sessions<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> VG Name logfs-sessions<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> LV UUID 32TRbe-OIDw-u4aH-fUmD-FLmU-5jRv-MaVYDg<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> LV Write Access read/write<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> LV Status available<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> # open 0<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> LV Size 100.56 TB<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> Current LE 26360253<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> Segments 18<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> Allocation inherit<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> Read ahead sectors 0<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> Block device 253:61<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>At this point what are our options to recover this filesystem?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thank you for any help you may be able to provide.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-family:"Arial","sans-serif";color:#4D4F53'>Jason Vagalatos<o:p></o:p></span></b></p>
</div>
</div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Joe Allen <br>
<b>Sent:</b> Wednesday, February 24, 2010 9:15 AM<br>
<b>To:</b> Jason Vagalatos<br>
<b>Subject:</b> Fwd: xfs_growfs failure....<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal><br>
wierd. he seems to be implying we were at 110tb and stuff is written there. I
guess we need to be 100% sure of the space allocated. were the other Luns ever
attached ?<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
</div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><br>
Begin forwarded message:<o:p></o:p></p>
</div>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><b>From:</b> Dave Chinner <<a
href="mailto:david@fromorbit.com">david@fromorbit.com</a>>ng <br>
<b>Date:</b> February 24, 2010 3:54:20 AM PST<br>
<b>To:</b> Joe Allen <<a href="mailto:Joe.Allen@citrix.com">Joe.Allen@citrix.com</a>><br>
<b>Cc:</b> "<a href="mailto:xfs@oss.sgi.com">xfs@oss.sgi.com</a>"
<<a href="mailto:xfs@oss.sgi.com">xfs@oss.sgi.com</a>><br>
<b>Subject:</b> <b>Re: xfs_growfs failure....</b><o:p></o:p></p>
</div>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<div>
<p class=MsoNormal>On Wed, Feb 24, 2010 at 02:44:37AM -0800, Joe Allen wrote:<br>
<br>
<o:p></o:p></p>
<p class=MsoNormal>I am in some difficulty here over a 100TB filesystem that<o:p></o:p></p>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>Is now unusable after a xfs_growfs command.<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><o:p> </o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>Is there someone that might help assist?<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><o:p> </o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>#mount: /dev/logfs-sessions/sessions: can't read superblock<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><o:p> </o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>Filesystem "dm-61": Disabling barriers, not
supported with external log device<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>attempt to access beyond end of device<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>dm-61: rw=0, want=238995038208, limit=215943192576<o:p></o:p></p>
</blockquote>
<p class=MsoNormal><br>
You've grown the filesystem to 238995038208 ѕectors (111.3TiB),<br>
but the underlying device is only 215943192576 sectors (100.5TiB)<br>
in size.<br>
<br>
I'm assuming that you're trying to mount the filesystem after a<br>
reboot? I make this assumption as growfs is an online operation and<br>
won't grow if the underlying block device has not already been<br>
grown. For a subsequent mount to fail with the underlying device<br>
being too small, something about the underlying block<br>
device had to change....<br>
<br>
What kernel version and xfsprogs version are you using?<br>
<br>
<br>
<o:p></o:p></p>
<p class=MsoNormal>xfs_repair -n <device> basically looks for superblocks
(phase 1 I<o:p></o:p></p>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>guess ) for a long time. I'm letting it run, but not much
hope.<o:p></o:p></p>
</blockquote>
<p class=MsoNormal><br>
Don't repair the filesystem - there is nothing wrong with it<br>
unless you start modifying stuff. What you need to do is fix the<br>
underlying device to bring it back to the size it was supposed to<br>
be at when the grow operation was run.<br>
<br>
What does /proc/partitions tell you about the size of dm-61? does<br>
that report the correct size, and if it does, what is it?<br>
<br>
<br>
<o:p></o:p></p>
<p class=MsoNormal>I'm hesitant to run xfs_repair -L or without the -n
flag for fear of making it worse.<o:p></o:p></p>
<p class=MsoNormal><br>
Good - don't run anything like that until you sort out whether the<br>
underlying device is correctly sized or not.<br>
<br>
<br>
<o:p></o:p></p>
<p class=MsoNormal>-bash-3.1# xfs_db -r -c 'sb 0' -c p
/dev/logfs-sessions/sessions<o:p></o:p></p>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>magicnum = 0x58465342<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>blocksize = 4096<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>dblocks = 29874379776<o:p></o:p></p>
</blockquote>
<p class=MsoNormal><br>
XFS definitely thinks it is 111.3TiB in size.<br>
<br>
<br>
<o:p></o:p></p>
<p class=MsoNormal>rblocks = 0<o:p></o:p></p>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>rextents = 0<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>uuid = fc8bdf76-d962-43c1-ae60-b85f378978a6<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>logstart = 0<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>rootino = 2048<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>rbmino = 2049<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>rsumino = 2050<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>rextsize = 384<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>agblocks = 268435328<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>agcount = 112<o:p></o:p></p>
</blockquote>
<p class=MsoNormal><br>
112 AGs of 1TiB each - that confirms the grow succeeded and it was<br>
able to write metadata to disk between 100 and 111 TiB without<br>
errors being reported. That implies the block device must have been<br>
that big at some point...<br>
<br>
<br>
<o:p></o:p></p>
<p class=MsoNormal>rbmblocks = 0<o:p></o:p></p>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>logblocks = 32000<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>versionnum = 0x3184<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>sectsize = 512<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>inodesize = 256<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>inopblock = 16<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>fname =
"\000\000\000\000\000\000\000\000\000\000\000\000"<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>blocklog = 12<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>sectlog = 9<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>inodelog = 8<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>inopblog = 4<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>agblklog = 28<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>rextslog = 0<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>inprogress = 0<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>imax_pct = 25<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>icount = 7291520<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>ifree = 8514<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>fdblocks = 6623185597<o:p></o:p></p>
</blockquote>
<p class=MsoNormal><br>
With 24.5TiB of free space<br>
<br>
<br>
<o:p></o:p></p>
<p class=MsoNormal>-bash-3.1# xfs_db -r -c 'sb 2' -c p
/dev/logfs-sessions/sessions<o:p></o:p></p>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>magicnum = 0x58465342<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>blocksize = 4096<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>dblocks = 24111418368<o:p></o:p></p>
</blockquote>
<p class=MsoNormal><br>
That's 89.9TiB...<br>
<br>
<br>
<o:p></o:p></p>
<p class=MsoNormal>rblocks = 0<o:p></o:p></p>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>rextents = 0<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>uuid = fc8bdf76-d962-43c1-ae60-b85f378978a6<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>logstart = 0<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>rootino = 2048<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>rbmino = 2049<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>rsumino = 2050<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>rextsize = 384<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>agblocks = 268435328<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>agcount = 90<o:p></o:p></p>
</blockquote>
<p class=MsoNormal><br>
And 90 AGs. That tells me the filesystem was created as a 90TiB<br>
filesystem. Can you tell me if you attempted to grow from 90TiB to<br>
100TiB or from 100TiB to 110TiB? There were bugs at one point in<br>
both the userspace grow code and the kernel code that resulted in<br>
bad grows (hence the need to know the versions this occurred on<br>
and what you were actually attempting to do), but these problems<br>
can usually be fixed up with some xfs_db magic.<br>
<br>
Cheers,<br>
<br>
Dave.<br>
-- <br>
Dave Chinner<br>
<a href="mailto:david@fromorbit.com">david@fromorbit.com</a><o:p></o:p></p>
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</blockquote>
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