[opensuse] Re: WD Green AV HD: rsync read errors mapping
On 2017-09-03 23:35, L A Walsh wrote:
Anton Aylward wrote:
${DEITY} help us when we have to check out the half dozen or so 4T drives for a RAID array!
---- I caught my RAID controller doing similar -- a patrol-read where it was doing all of them in the container in parallel.
Carlos E. R. wrote:
I also have the theory of not throwing away my disks the first time they have bad sectors. Allow remapping, then keep them under observation. If there are no more bad sectors (after long test, perhaps full dd writeover), I feel safe. If bad sectors keep appearing, then replace fast.
---- I've had the opposite practice -- the first time a drive starts remapping -- replace it ASAP. Even if it is starting to fail, it will start to be slower as more and more sectors are remapped and need to be have extra seeks.
You can't rely on files being contiguous anymore (even when the the Os reports them as contiguous) because the disk will still report them as contig to the OS.
Finally -- once a disk starts remapping, I'm almost certain that a HW RAID controller will kick it out of an array because that disk won't keep up with the other disks.
Well, if the number of bad sectors keep growing, I also kick the disk out. I have disks in use that once developed a few bad sectors, but not any more. I kept using them for several years and there were no more incidents, till I retired them "because old age", or simply because they are too small. However, I don't use raid, the situation may be different there, because of the timing issues you mention. But notice that if the disk continues to grow bad sectors, I do not use it. -- Cheers / Saludos, Carlos E. R. (from 42.2 x86_64 "Malachite" at Telcontar)
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Carlos E. R.