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4334 Improve ZFS N-way mirror read performance

*** 547,556 **** --- 547,562 ---- "both DKIOCGMEDIAINFO{,EXT} calls failed, %d\n", vd->vdev_path, error); pbsize = DEV_BSIZE; } + /* + * Determine the rotation + */ + vd->vdev_rotation_rate = VDEV_RATE_UNKNOWN; + /* TODO: Implement when there's an ioctl which provides this info. */ + *ashift = highbit(MAX(pbsize, SPA_MINBLOCKSIZE)) - 1; if (vd->vdev_wholedisk == 1) { int wce = 1;