On 2015-12-02 17:31, Karel Gardas wrote:
I think RAID1C is capable of detecting mis-directed write. I wrote
about it in some of my previous email.
Hi Karel,
I'll follow up on the other things in a separate email later, but, you
clarify that you think RAID1C has protection against misdirected writes
already - I don't understand how it works, can you please explain to me
*exactly* how it can be said to be solid against misdirected writes?:
Let's assume the following nightmare scenario:
* You write data to sector X. All the physical writes for that on all
the underlying disks are mis-directed (about 4 writes).
* Sector X is wiped from the filesystem cache and any other cache,
except for any cached hash or checksum values that RAID1C guaranteedly
stores in RAM for its whole time of operation.
* An fread() of sector X is done.
What happens on the fread()?
Thanks!
Tinker
