On Sun, 28 Oct 2012 15:07:53 -0600 Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote: > > On Oct 28, 2012, at 2:50 PM, Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote: > > > For any serious use I just wouldn't use the Greens, without very non-consumer like scrubs, extended smart tests, and cycling out drives so they could be ATA Enhance Secure Erase nuked say once a year or maybe more often. And a rigorous backup. With that kind of expertise and dedication should come a better budget for a better drive. > > On 2nd thought, I'd consider the greens something like a "hostile witness" in legal jargon. Relegate them to only ZFS or btrfs (or ReFS maybe, unclear) for "raid" like pooling or redundancy. The drives themselves are inherently suspect so a suspicious grand inquisitor of a file system seems like an appropriate match, to constantly 2nd guess them. Now you are moving into unfounded superstitions territory. You seem to imply that a Green drive would return just plain bad data in some failure condition (else why all the checksumming FSes?), and not an IO Error. I don't think anything of this sort has been demonstrated so far, and while this could happen due to bad RAM/chipset/controller/bus/cache/etc, this would have nothing to do specifically with "Greenness" of a drive, nor any particular model would be inherently more prone to that. > But still, once a drive is asked to retrieve an LBA, so long as the drive eventually reports it back correctly, the file system won't correct that sector merely for a delay, even if it is up to 2 minutes or whatever it is. So, filesystem choice doesn't really solve the delay problem. You just have to obliterate the disk periodically with zeros or secure erase. I do not think there is a state in modern HDDs that there would be a sector which consistently takes 30-120 seconds to read. Those are either unreadable at all, or readable after a delay -- and then already remapped by the HDD into the reserved zone, so the delay is not there the next time. -- With respect, Roman ~~~~~~~~~~~~~~~~~~~~~~~~~~~ "Stallman had a printer, with code he could not see. So he began to tinker, and set the software free."
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