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From: Heming Zhao <heming.zhao@suse.com>
To: LVM general discussion and development <linux-lvm@redhat.com>,
	Gang He <GHe@suse.com>
Subject: Re: [linux-lvm] pvresize will cause a meta-data corruption with error message "Error writing device at 4096 length 512"
Date: Fri, 11 Oct 2019 09:22:57 +0000	[thread overview]
Message-ID: <dd28a375-f1f5-9ae0-e843-cb67de3136a9@suse.com> (raw)
In-Reply-To: <6b055125-2e06-df7d-89fa-6c347404a9cd@suse.com>

Only one thing I am confusion all the time.
When read/write error, lvm will call bcache_invalidate_fd & _scan_dev_close to close fd.
So the first successfully read (i.e.: f747), which following f748 finally has fc68's fd.
This will cause f747 metadata overwrite not f748.

the sequence of disk scanning:
```
  scsi-360060e80072a670000302a670000fc69 <=== successful
  scsi-360060e80072a670000302a670000fc68 <=== first failed
  scsi-360060e80072a670000302a670000fc67
  scsi-360060e80072a670000302a670000fc66
  scsi-360060e80072a660000302a660000f74c
  scsi-360060e80072a660000302a660000f74a
  scsi-360060e80072a660000302a660000f749
  scsi-360060e80072a660000302a660000f748 (has fc68 metadata) <=== last failed
  scsi-360060e80072a660000302a660000f747 <=== first successfully read following last failed
```

Hope you understand my saying.


On 10/11/19 4:11 PM, Heming Zhao wrote:
> Hello list,
> 
> I analyze this issue for some days. It looks a new bug.
> 
> trigger steps:
> user execute pvresize to enlarge the pv.
> After the command execution, one disk lvm metadata was overwrite by another disk lvm metadata.
> 
> once log (execute pvresize cmd), there are 7 disk occur read/write failed:
> ```
> scsi-360060e80072a670000302a670000fc68
> scsi-360060e80072a670000302a670000fc67
> scsi-360060e80072a670000302a670000fc66
> scsi-360060e80072a660000302a660000f74c
> scsi-360060e80072a660000302a660000f74a
> scsi-360060e80072a660000302a660000f749
> scsi-360060e80072a660000302a660000f748 (has fc68 metadata)
> ```
> the f748 metadata was overwritten by fc68.
> 

  reply	other threads:[~2019-10-11  9:27 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-11  9:17 Gang He
2019-09-11 10:01 ` Ilia Zykov
2019-09-11 10:03 ` Ilia Zykov
2019-09-11 10:10   ` Ingo Franzki
2019-09-11 10:20     ` Gang He
2019-10-11  8:11 ` Heming Zhao
2019-10-11  9:22   ` Heming Zhao [this message]
2019-10-11 10:38     ` Zdenek Kabelac
2019-10-11 11:50       ` Heming Zhao
2019-10-11 15:14   ` David Teigland
2019-10-12  3:23     ` Gang He
2019-10-12  6:34     ` Heming Zhao
2019-10-12  7:11       ` Heming Zhao
2019-10-14  3:07         ` Heming Zhao
2019-10-14  3:13         ` Heming Zhao
2019-10-16  8:50           ` Heming Zhao

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