Re: bcache vs enhanceio?

[Roy Sigurd Karlsbakk <roy-ooPBL11mRiZbRRN4PJnoQQ@public.gmane.org>]

Wouldn't it be better to allow the sysadmin to determine the safety?
Also, if running in writethrough, why shouldn't an SSD be allowed to be added in realtime?
All of this works well with systems like ZFS. I really don't see a reason for a filesystem being created to allow caching

roy

----- Opprinnelig melding -----
> Hi Roy,
> 
> This is by design, and minimizes the potential for data corruption.
> 
> If you have a backing device with an existing filesystem, and are
> caching this in writeback mode, then reboot the system and the cache
> device does not come up, the backing device could still come up and
> could potentially be out of sync with the writes that were buffered to
> the cache device.
> 
> With bcache in writeback mode, if it cannot attach the cache device it
> will not register the backing device.
> 
> 
> I am sure Kent will provide a much better answer than I have :)
> 
> 
> 
> 
> Regards,
> 
> 
> 
> 
> Andrew
> 
> On 2/8/2013 10:25 AM, Roy Sigurd Karlsbakk wrote:
> > Hi
> >
> > Seems old flashcache and the new enhanceio can add flash drives on
> > the run, while bcache needs the filsystem to be built with them.
> >
> > What is the future of bcache in this setting?
> >

-- 
Vennlige hilsener / Best regards

roy
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