Re: [LFS/VM TOPIC] Stable pages while IO (was Wrong DIF guard tagon ext2 write)

[Vladislav Bolkhovitin]

Boaz Harrosh, on 06/03/2010 08:09 PM wrote:
> [Topic]
> How to not let pages change while in IO
>
> [Abstract]
> As seen in a long thread on the fsdvel scsi mailing lists. Lots of
> people have headaches and sleep less nights because individual pages
> can change while in IO and/or DMA. Though each one as slightly different
> needs, the mechanics look to be the same.
>
> People that care:
> - Mirror and RAID people that need on disk consistency.
> - Network storage that wants data checksum.
> - DIF/DIX people

 - Load balancing MPIO clusters, where out of order execution of 
overlapping write requests for the changed pages can introduce a data 
corruption, which makes using Linux with load balancing MPIO clusters 
unsafe.

> - ...
>
> I for one know nothing of the subject but am a RAID person and would
> like a solution that does not force me to copy the complete data load.
>
> Please lets get all the VM VFS and drivers people in one room and see
> if we can have a Linux solution to this problem
>
> Boaz
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