FW: [linux-lvm] Help with LVM reconstruction

[Robin Thompson]

Hi, Problem is that I don't  - the card will only refer to it in 2gb - but it could be actually 2tb as in 2 x 1024 x 1024 x 1024 x1024 bytes. I can extract this:  ̸¶ÿ LVM2 x[5A%r0N*>
           ð            I      ¬Zí¾                                                                                                                                                                                                                                                                                                                                                                                                                                                                    2terabytes {id = "ApBoL0-71Q4-e0yC-JyTI-cORC-8Yd1-Wgsf3M"seqno = 1status = ["RESIZEABLE", "READ", "WRITE"]extent_size = 8192max_lv = 256max_pv = 256physical_volumes {pv0 {id = "QADZl1-asMf-PyLf-EIw1-qLkv-ZbFI-2goQUD"device = "/dev/sdb1"status = ["ALLOCATABLE"]pe_start = 384pe_count = 524286}}}# Generated by LVM2: Mon Apr 30 18:54:48 2007contents = "Text Format Volume Group"version = 1description = ""creation_host = "r" # Linux r 2.6.18-4-686 #1 SMP Mon Mar 26 17:17:36 UTC 2007 i686creation_time = 1177955688 # Mon Apr 30 18:54:48 2007                                                                                                                                                                                                                                                                                                                                                                                                                                                          2terabytes {id = "ApBoL0-71Q4-e0yC-JyTI-cORC-8Yd1-Wgsf3M"seqno = 2status = ["RESIZEABLE", "READ", "WRITE"]extent_size = 8192max_lv = 256max_pv = 256physical_volumes {pv0 {id = "QADZl1-asMf-PyLf-EIw1-qLkv-ZbFI-2goQUD"device = "/dev/sdb1"status = ["ALLOCATABLE"]pe_start = 384pe_count = 524286}pv1 {id = "lT0VrQ-uAur-IlZB-htso-Ezqf-nq95-YykdbX"device = "/dev/sdc1"status = ["ALLOCATABLE"]pe_start = 384pe_count = 12225}}}# Generated by LVM2: Mon Apr 30 18:55:06 2007contents = "Text Format Volume Group"version = 1description = ""creation_host = "r" # Linux r 2.6.18-4-686 #1 SMP Mon Mar 26 17:17:36 UTC 2007 i686creation_time = 1177955706 # Mon Apr 30 18:55:06 2007                                                                                                                                                                                                                                                                                                                    2terabytes {id = "ApBoL0-71Q4-e0yC-JyTI-cORC-8Yd1-Wgsf3M"seqno = 3status = ["RESIZEABLE", "READ", "WRITE"]extent_size = 8192max_lv = 256max_pv = 256physical_volumes {pv0 {id = "QADZl1-asMf-PyLf-EIw1-qLkv-ZbFI-2goQUD"device = "/dev/sdb1"status = ["ALLOCATABLE"]pe_start = 384pe_count = 524286}pv1 {id = "lT0VrQ-uAur-IlZB-htso-Ezqf-nq95-YykdbX"device = "/dev/sdc1"status = ["ALLOCATABLE"]pe_start = 384pe_count = 12225}}logical_volumes {2TBData {id = "Kki2Ar-91IF-IueI-GN62-jD6o-Yl0V-hq5Y3A"status = ["READ", "WRITE", "VISIBLE"]segment_count = 2segment1 {start_extent = 0extent_count = 524286type = "striped"stripe_count = 1 # linearstripes = ["pv0", 0]}segment2 {start_extent = 524286extent_count = 12225type = "striped"stripe_count = 1 # linearstripes = ["pv1", 0]}}}}# Generated by LVM2: Mon Apr 30 18:57:56 2007contents = "Text Format Volume Group"version = 1description = ""creation_host = "r" # Linux r2.6.18-4-686 #1 SMP Mon Mar 26 17:17:36 UTC 2007 i686creation_time = 1177955876 # Mon Apr 30 18:57:56 2007 What should i expect to find on the second PV? (50gb) - there is only 800gb in the total volume - so I wouldn't expect to find any data on it, but should there be any "header information" at the start of the drive?When i seek to the 2tb byte in the virtual image file - its blank -  no evidence of any data - is this normal?Robin

> Date: Sun, 5 Oct 2008 21:58:11 +0200> From: marki at marki-online.net> To: linux-lvm at redhat.com> Subject: Re: [linux-lvm] Help with LVM reconstruction> > Hi Robin,> > Sunday, October 5, 2008, 21:09:56, Robin Thompson wrote:> > > In short the data is intact, and I have found a program called RAID> > Reconstructor that will produce an image file of the RAID 5 arrays.> > This will be hopefully 2.05tb file.> > > > I've read that I can use losetup and vgscan to create LVM from 2> > image files. But i'm unsure of how to proceed with when i have only> > one file which is combination of both.> > > > Anyone out there any advice or help?> > I have used losetup few times when doing tests with LVM. Your problem> is that you have 2 PVs in 1 file (if I understand it correctly). If> you know the exact size in bytes of the 2tb PV, then you can use dd to> skip those 2tb and copy only the last 50gb into different file. Then> truncate the original to 2tb (or copy first 2tb).> Then you should have 2 files with your 2 PVs. But think of (or test)> any headers that could be in the begining of those files (for example> partition table and only inside partition there is PV).> But generally, it should be possible to use those files as PVs.> > -- > bYE, Marki> > > _______________________________________________> linux-lvm mailing list> linux-lvm at redhat.com> https://www.redhat.com/mailman/listinfo/linux-lvm> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

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