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Re: [dm-devel] Device Mapper as a cache for SAN?



On Mon, 2006-04-10 at 14:46 -0500, Eric Van Hensbergen wrote:
> On 4/10/06, Ed Wilts <ewilts ewilts org> wrote:
> >
> > The obvious question is why?  What would this provide that the kernel
> > and file systems don't already provide?
> >
> 
> Well, kernel provides in-memory page cache, not local disk page cache.
>  There is some ongoing remote file system local disk cache work being
> done, but it applies primarily to AFS and NFS - not block-based
> transports such as iSCSI and AOE.  The various cluster file systems
> may provide something more akin to this, but again, this doesn't
> really cover SAN technologies -- not in any sort of a generic way. 
> Let me know if I'm missing something.

still, what is the main benefit of this cache? what u mean "local disk
page cache"? use "local disk" as page cache or page cache for "local
disk" or something else?

ming


> 
>         -eric
> 
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