On Wed, Mar 18, 2009 at 09:58:02AM +0100, Navid Zamani wrote: > Hello DM mailing list. > > I a have a simple question: > Is there a way to use the device-mapper to hang an arbitrary program > in-between a real block device, and the virtual device created by the > device-mapper? > Like with LUKS. Only that I do not want to compress or encrypt. I want > to hang an error-correcting transcoder in between, so I can put ECC on > any block device I want. > The optimal thing would be a simple API, that is implemented in many > languages. (Like FUSE is available in many languages.) > Something like this would really be a powerful abstraction to have. > > In case you are interested in the reasons: Modern consumer HDDs do not > have any ECC, but they get less and less reliable. It went so far, that I thought that the more recent patches by Oracle to support DIF/DIX (Data Integrity Extensions): http://oss.oracle.com/projects/data-integrity/dist/documentation/linux-hba.pdf Are addressing this by adding a checksum for each block sector that is checked by each device. So the firmware on the hard-drive, along with the SAS controller would carry out the checksumming? -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
