lvm полетел

root@XenServer:~# fdisk /dev/sdb

The device presents a logical sector size that is smaller than
the physical sector size. Aligning to a physical sector (or optimal
I/O) size boundary is recommended, or performance may be impacted.

Command (m for help): p

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *        4096      208895      102400    7  HPFS/NTFS/exFAT
/dev/sdb2          208896   314572799   157181952    7  HPFS/NTFS/exFAT
/dev/sdb3       314576896   943718399   314570752    7  HPFS/NTFS/exFAT

cat /etc/lvm/backup/WD10000 
# Generated by LVM2 version 2.02.95(2) (2012-03-06): Thu Aug 28 21:50:01 2014

contents = "Text Format Volume Group"
version = 1

description = "Created *after* executing 'lvcreate -n disk_300g -L300G WD10000'"

creation_host = "XenServer"	# Linux XenServer 3.2.0-4-amd64 #1 SMP Debian 3.2.60-1+deb7u3 x86_64
creation_time = 1409237401	# Thu Aug 28 21:50:01 2014

WD10000 {
	id = "03lfPR-6xZo-YmYV-aSJF-JFaZ-uYQu-pxp8nN"
	seqno = 5
	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 = "t5FN9X-Jc5h-qnIe-eofd-sXPK-23KA-tQ65JL"
			device = "/dev/sdb"	# Hint only

			status = ["ALLOCATABLE"]
			flags = []
			dev_size = 976773168	# 465,762 Gigabytes
			pe_start = 2048
			pe_count = 119234	# 465,758 Gigabytes
		}
	}

	logical_volumes {

		disk_150g {
			id = "p1UYql-2BCF-rmUS-BvTx-DCm1-PXre-BeZ3Bt"
			status = ["READ", "WRITE", "VISIBLE"]
			flags = []
			creation_host = "XenServer"
			creation_time = 1409237286	# 2014-08-28 21:48:06 +0700
			segment_count = 1

			segment1 {
				start_extent = 0
				extent_count = 38400	# 150 Gigabytes

				type = "striped"
				stripe_count = 1	# linear

				stripes = [
					"pv0", 0
				]
			}
		}

		disk_300g {
			id = "ToZ06c-BWaf-0tby-WtSc-tIKv-XFQ3-ea42cv"
			status = ["READ", "WRITE", "VISIBLE"]
			flags = []
			creation_host = "XenServer"
			creation_time = 1409237401	# 2014-08-28 21:50:01 +0700
			segment_count = 1

			segment1 {
				start_extent = 0
				extent_count = 76800	# 300 Gigabytes

				type = "striped"
				stripe_count = 1	# linear

				stripes = [
					"pv0", 38400
				]
			}
		}
	}
}