Disk error rates
Posted Jul 8, 2006 16:27 UTC (Sat) by giraffedata
In reply to: The 2006 Linux File Systems Workshop
Parent article: The 2006 Linux File Systems Workshop
The article failed to specify completely the denominators in the error rates mentioned.
The article means to say that the error rate per bit read has gone down, but the error rate per disk per day has gone up. And with the implicit assumption that people have one filesystem per disk and use all the space, then the error rate per filesystem per day has gone up. It obviously assumes a system that, as it keeps more data, accesses more data too.
Oh, and an error is an instance of trying to read back a particular piece of data and not being able to. It usually means permanent data loss.
The reason the article brings it up is that if the error rate per filesystem per day goes up, so does the FSCK rate per filesystem per day, and with the cost per FSCK also going up proportional to the filesystem size, the FSCK cost per day goes up.
to post comments)