Linux on 390 Port <[email protected]> wrote on 01.02.2007 19:56:06:
> I recommend that you he creates 3 partitions in each 3390-3, and that the > number of partitions is equal to the number of stripes. Creating partitions to stripe won't help at all. I/O to any partition ends up on the same device (from the driver's point of view). And the DASD driver only runs one single I/O per device. The recommendation about channel paths for ESCON and number of devices for FICON and SCSI comes, as far as I know, from the limitation of the ESCON channel, which will be busy as long as an I/O is processed (per channel path). So trying to have more requests running in parallel than there are channel paths doesn't work. Anyways, I guess you have to use the number of disks as number of stripes if you want to combine all DASDs into one big logical volume. If I remember correctly this is a limitation of the LVM2 tools. Regards, Stefan ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
