hi, everyone: when I read the filestore.cc, I find the ceph use crc the check the data. Why should check the data? In my knowledge, the disk has error-correcting code <http://en.wikipedia.org/wiki/Error-correcting_code> (ECC) for each sector. Looking at wiki: http://en.wikipedia.org/wiki/Disk_sector, "In disk drives, each physical sector is made up of three basic parts, the sectorheader <http://en.wikipedia.org/wiki/Header_(computing)>, the data area and the error-correcting code <http://en.wikipedia.org/wiki/Error-correcting_code> (ECC)". So if the data is not correct. the disk can recovery it or return i/o error. Does anyone can explain it? Thanks -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.ceph.com/pipermail/ceph-users-ceph.com/attachments/20140904/1ea821a3/attachment.htm>
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