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-   -   Hard drive or SSD that always verifies data written? (http://www.linuxquestions.org/questions/linux-hardware-18/hard-drive-or-ssd-that-always-verifies-data-written-4175450440/)

Ulysses_ 02-16-2013 11:45 AM

Hard drive or SSD that always verifies data written?
 
This guy here says the O/S or driver (or firmware?) verifies every sector written to a hard drive. If verification fails, the sector is marked as bad.

However verification does not occur with video recording he says, because the drive is written to continuously.

Does any hardware exist, hard drive or solid state drive, that always verifies data written, and always writes to another sector when verification fails?

jefro 02-16-2013 03:49 PM

Some ssd's might be able to test the data it received and that is not fully what you want. You'd want to verify that some application did in fact write to the disk and was able to fully read it.


There used to be a switch in dos to verify after write. I get the feeling there was a similar switch in linux too. I can't find it just now.

From what I understand, a journaling system would be enough.


Maybe others have input on this.

Ulysses_ 02-17-2013 08:03 AM

Thanks, you helped me write better queries in google, and here is the answer, even better than just verify after write:

Use ZFS with the copies=2 option

http://en.wikipedia.org/wiki/ZFS

Or ZFS mirroring:

https://blogs.oracle.com/timc/entry/...s_self_healing

Would be nice if ext3 could do that. Anyone know how?

syg00 02-17-2013 08:34 AM

Not ext3, but look into btrfs. Not as comprehensive as ZFS, but should suffice.

BTW, you should close your parallel thread.

Ulysses_ 02-17-2013 12:42 PM

Dunno how to close a thread. Maybe it's a mods-only feature.


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