I did discover that I can do a whole bunch of them in parallel, getting the i/o rates 4000k/sec or so seemingly without any effect to anyone else. When it’s a 1TB LVM, I don't want to split them any further, but waiting an hour or two so isn't as bad as doing them one at a time.
Thanks for the xargs tip! Good idea! -----Original Message----- From: Linux on 390 Port [mailto:[email protected]] On Behalf Of Pavelka, Tomas Sent: Tuesday, March 04, 2014 12:01 AM To: [email protected] Subject: Re: [LINUX-390] dasdfmt slowness What we do to speed dasdfmt up is to split the large dasd into smaller minidisks and join them by LVM. Then the individual minidisks can be formatted in parallel. This is easy to script with xargs, which has the parameter --max-procs that lets you specify the maximum number of worker processes to spawn. Tomas
