Hi Timothy, > > I think that if you are running an illumos kernel, you can use > /kernel/drv/sd.conf and tell it that the physical sectors for a disk > model are 4k, despite what the disk says (and whether they really > are). So, if you want an ashift=12 pool on disks that report 512 > sectors, you should be able to do it now without a patched version of > zpool.
That refers to creating a new pool and is good to know. However I was more afraid about the comments in the "Advanced Format" threat stating that if you have an ashift=9 512b based pool and need to replace a drive, resilver might fail if you put in a 4K disk. Assuming that in 2-3 years you might not be able to get 512b disks in the size you need them anymore, this could be a serious problem. > I think prtvtoc is all you need to determine > if it is aligned, if the bytes/sector value under Dimensions is the > true (physical) sector size, it should be aligned (if it reports 512 > when it has 4k sectors, then in theory if "First sector" is a multiple > of 8, it is aligned, but it will probably issue writes of size 512 > which will degrade performance anyway). Thanks. I will note that down and check once the drives arrive. Kind regards, JP
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