[Twg] [Discuss] T10 End-to-End Data Integrity HLD

[Alexey Lyashkov]

some results of online discussion.

Johann worry about journal checksumming (to avoid overhead in that area) or other metadata checks on  
client store uncommitted data in own queue for a replay (if need), but in case journal checksum errors on write client will able to resend failed request via special protocol extension (don't exist now).
same situation if we need a T10 support for these data we will be need trigger a failover or change a wire protocol to resend a failed request.
failover is easily.


On Apr 24, 2012, at 14:53, Johann Lombardi wrote:

> On Tue, Apr 24, 2012 at 9:44 PM, Alexey Lyashkov <alexey_lyashkov at xyratex.com> wrote:
> what you mean as metadata blocks? extent's on OST or MDT disk io traffic ?
> 
> Yes, anything that goes to the journal (inode, block bitmap, ...) which isn't user data.
> 
> Johann

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