Neil,
Exactly what I had in mind.
Some vendors claim they do parity checking for reads. Technically it
should be possible for Linux RAID as well but is not implemented – correct?
Reliability data for unrecoverable read errors:
- enterprise SAS drive (ST3300655SS): 1 in 10^16 bits transfered, ~ 1
error in 1,1 PB
- enterprise SATA drive (ST3500630NS): 1 in 10^14 bits transfered, ~ 1
error in 11 TB
For a single SATA drive @ 50 MB/s it take on average 2,7 days to
encounter an error.
For a large RAID with several drives this becomes much lower or am I
viewing this wrong?
Regards,
Mirko
Neil Brown schrieb:
On Tuesday April 3, mirko.benz@xxxxxx wrote:
Hi,
Is parity calculation and validation for read operations supported?
I guess what you are asking is:
With raid5, I would like the drive to handle a read request by
reading all the blocks in the stripe and checking the parity. If
the parity is correct, return the data blocks. If it is not, then
fail the read request. Is that possible?
No, it is not.
If you are really asking something else, please be more specific.
NeilBrown
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
