On Wed, Apr 6, 2011 at 3:06 PM, Alexander Graf <agraf@xxxxxxx> wrote: > I've asked around and from what I've gathered there is no way to modify the 12 blocks/track piece in z/VM. I'm not sure if this is true - I'm not s390 expert myself - but at least I haven't seen a single disk that would behave differently. You may not have asked the right people or fluffy animals... ;-) Tracks can be formatted in any way you like. If you format it like a series of 4K blocks the track of a 3390 holds 12 blocks. > Could you please tell me some way to format a dasd device so that it has a blocks/track value different from 12? Also, do people actually do this? CMS can. And the device driver supports it as far as I know Apr 6 06:34:09 roblnx1 kernel: dasd(eckd): 0.0.019d: 3390/0A(CU:3990/01) Cyl:146 Head:15 Sec:224 Apr 6 06:34:09 roblnx1 kernel: dasd(eckd): 0.0.019d: (1kB blks): 72270kB at 33kB/trk linux disk layout Apr 6 06:34:09 roblnx1 kernel: dasdd:CMS1/ MNT19D: dasdd1 Whether people do this is hard to tell. I could see some value in using 1 block of 55K per track (or 52K if it must divide by 4) if that could make the logical structures align with the physical ones (DASD subsystem logic is still track based). Rob -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
