Re: Silent data corruption (3.11-rc4) in writethrough mode

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On Mon, Aug 12, 2013 at 10:22:47AM +0200, Frédéric VANNIÈRE wrote:
> Hello,
> 
> I'm using bcache for Xen hosting. The configuration is :
>   - Servers HP Proliant DL360 G5/G7/Gen8
>   - Backend : HP Smart Array with 2GB write cache (protected), it's a partition like /dev/sda2
>   - Cache device : OWC Mercury Accelsior PCIe (2 x Sandforce in RAID0 on Marvell 88SE9230), the whole disk like /dev/sdb
>   - Cache mode : writethrough
>   - Kernel : 3.10.5 with bcache driver from 3.11-rc4
>   - Setup process : make-bcache -B /dev/sda2 ; make-bcache -C /dev/sdb ; then attached cache device to backend.
>   - LVM setup : pvcreate /dev/bcache0  , vgcreate xen_data /dev/bcache0 . Each VM has a LV volume on "xen_data"
> 
> On some hosts I've noticed very strange behavior with random mysql crashes, mysql innodb data corruption, filesystem corruption.
> 
> I'm running md5 check on system files each night and compares it to debian's database, on some VMs there where modified files (bad MD5).
> When I detached the cache device, dropped virtualmemory cache on guest and synced FS, the MD5 of the files where OK again without rebooting.
> 
> It lookes like bcache had corrupted data in cache, they are no kernel logs on the host, no errors.

Ouch... This wasn't occuring on 3.10?
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