Re: [linux-lvm] thin: 235:2 pool target (735616 blocks) too small: expected 809216

[Zdenek Kabelac <zdenek.kabelac@gmail.com>]

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Dne 2.6.2016 v 12:49 Brian J. Murrell napsal(a):
> On Thu, 2016-06-02 at 11:11 +0200, Zdenek Kabelac wrote:
>> Hi
>
> Hi.
>
>> So it seems your  machine has crashed (you probably know better)
>> during
>> thin-pool resize operation.
>
> So, this is actually a family member's machine and he was using it at
> the time so I don't know, firsthand what happened.
>
> He says he was just adding some plugin to some (Windows) program in
> Wine.  Doesn't seem like that should come anywhere near resizing so I
> will ask him again.
>

Yep that might explain 'missing' surrouding details...
Basically any write might result in thin-pool running out of threshold
and requireing new space - what's unclear is the later failure which
would be really good to know....


>> Unfortunately fc23 has lvm2 version 2.02.132 - and version 2.02.133
>> has
>> improvement patch to make the resize more resistent (but still not as
>> good as
>> I wish to be).
>
> Incremental improvements are improvements all the same.  :-)
>
>> So what happened -  lvm2 resized _tdata LV - tried to resumed it -
>> and
>> it has failed along this path - however since the 'resize' is ATM a
>> single
>> transaction - the lvm2 rollback reverted to previous size - yet thin-
>> pool
>> already managed to remembered 'new' bigger size.
>
> Ahhh.
>
>> So please take a look at your logs (if you have some) if there
>> is something suspicious to be mentioned (thought if you machined
>> has freezed, hardly any log will be available).
>
> I will take a look once I can get the system back up and running.
>
>> To get access to your thin-pool - I'm attaching restored metadata
>> content from
>> your disk header with 'bigger' _tdata volume.
>
> There was no attachment.
>

Ops  - so once again ;)



>> To restore use:
>>
>> 'vgcfgrestore -f back  --force brianr-laptop'
>
> I can do that in Fedora's "rescue" environment?  Probably "lvm
> vgcfgrestore -f back  --force brianr-laptop" instead.
>
>> It would be really interesting to know the reason of failure - but I
>> can
>> understand you could hardly obtain.
>
> I will see if there is anything in the logs and get back to you.  It's
> the least I can do in return for the help you have provided.  Much
> appreciated.
>
> Cheers,

Zdenek



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# Generated by LVM2 version 2.02.155(2)-git (2016-05-14): Thu Jun  2 11:00:16 2016

contents = "Text Format Volume Group"
version = 1

description = "vgcfgbackup -f back brianr-laptop"

creation_host = "linux"	# Linux linux 4.6.0-1.fc25.x86_64 #1 SMP Mon May 16 14:57:01 UTC 2016 x86_64
creation_time = 1464858016	# Thu Jun  2 11:00:16 2016

brianr-laptop {
	id = "remwwI-SXei-swn5-9r5D-shjG-iqgP-UraDRi"
	seqno = 29
	format = "lvm2"			# informational
	status = ["RESIZEABLE", "READ", "WRITE"]
	flags = []
	extent_size = 8192		# 4 Megabytes
	max_lv = 0
	max_pv = 0
	metadata_copies = 0

	physical_volumes {

		pv0 {
			id = "t0OI9M-lExB-ZraT-4p4o-r20E-obtw-OtrtRL"
			device = "/dev/loop0"	# Hint only

			status = ["ALLOCATABLE"]
			flags = []
			dev_size = 494223360	# 235,664 Gigabytes
			pe_start = 2048
			pe_count = 60330	# 235,664 Gigabytes
		}
	}

	logical_volumes {

		pool00 {
			id = "wPFVij-HJpy-QYtM-9ekQ-65DX-MRPj-p55mpW"
			status = ["READ", "WRITE", "VISIBLE"]
			flags = []
			creation_time = 1430510215	# 2015-05-01 21:56:55 +0200
			creation_host = "localhost"
			segment_count = 1

			segment1 {
				start_extent = 0
				extent_count = 12644	# 49,3906 Gigabytes

				type = "thin-pool"
				metadata = "pool00_tmeta"
				pool = "pool00_tdata"
				transaction_id = 3
				chunk_size = 128	# 64 Kilobytes
				discards = "passdown"
				zero_new_blocks = 1
			}
		}

		home {
			id = "MyMBIk-Vb2A-H9dx-6jfA-TcpM-WcVk-imiust"
			status = ["READ", "WRITE", "VISIBLE"]
			flags = []
			creation_time = 1430510215	# 2015-05-01 21:56:55 +0200
			creation_host = "localhost"
			segment_count = 1

			segment1 {
				start_extent = 0
				extent_count = 5120	# 20 Gigabytes

				type = "thin"
				thin_pool = "pool00"
				transaction_id = 0
				device_id = 1
			}
		}

		root {
			id = "z3iQ0s-O2dD-qLv2-QXhR-RiK9-e7dq-BWRX6r"
			status = ["READ", "WRITE", "VISIBLE"]
			flags = []
			creation_time = 1430510222	# 2015-05-01 21:57:02 +0200
			creation_host = "localhost"
			segment_count = 1

			segment1 {
				start_extent = 0
				extent_count = 3840	# 15 Gigabytes

				type = "thin"
				thin_pool = "pool00"
				transaction_id = 1
				device_id = 2
			}
		}

		swap {
			id = "jo1Nr6-IJdx-azkx-pmEw-qV7R-yr2M-ACWu2s"
			status = ["READ", "WRITE", "VISIBLE"]
			flags = []
			creation_time = 1430510228	# 2015-05-01 21:57:08 +0200
			creation_host = "localhost"
			segment_count = 1

			segment1 {
				start_extent = 0
				extent_count = 1472	# 5,75 Gigabytes

				type = "thin"
				thin_pool = "pool00"
				transaction_id = 2
				device_id = 3
			}
		}

		lvol0_pmspare {
			id = "NRyvBs-VFJJ-yRJv-e62a-N6FC-cjRj-it4Y4O"
			status = ["READ", "WRITE"]
			flags = []
			creation_time = 1430510215	# 2015-05-01 21:56:55 +0200
			creation_host = "localhost"
			segment_count = 1

			segment1 {
				start_extent = 0
				extent_count = 7	# 28 Megabytes

				type = "striped"
				stripe_count = 1	# linear

				stripes = [
					"pv0", 0
				]
			}
		}

		pool00_tmeta {
			id = "MFnJK1-fkVP-ERt6-TKTN-5DPr-SdNI-2Si8LM"
			status = ["READ", "WRITE"]
			flags = []
			creation_time = 1430510215	# 2015-05-01 21:56:55 +0200
			creation_host = "localhost"
			segment_count = 1

			segment1 {
				start_extent = 0
				extent_count = 7	# 28 Megabytes

				type = "striped"
				stripe_count = 1	# linear

				stripes = [
					"pv0", 6600
				]
			}
		}

		pool00_tdata {
			id = "NqzQU0-GS2v-5rA6-vy7d-vRt2-lJWL-76kBnj"
			status = ["READ", "WRITE"]
			flags = []
			creation_time = 1430510215	# 2015-05-01 21:56:55 +0200
			creation_host = "localhost"
			segment_count = 2

			segment1 {
				start_extent = 0
				extent_count = 6593	# 25,7539 Gigabytes

				type = "striped"
				stripe_count = 1	# linear

				stripes = [
					"pv0", 7
				]
			}
			segment2 {
				start_extent = 6593
				extent_count = 6051	# 23,6367 Gigabytes

				type = "striped"
				stripe_count = 1	# linear

				stripes = [
					"pv0", 6607
				]
			}
		}
	}

}