ref: 1720551fd69a86363dcaff6c36e58a9b00ee6332
dir: /sys/doc/fs/p7/
.SH Sync Copy and WORM Copy Processes .PP The .CW scp process wakes up every ten seconds and issues writes to blocks in the buffer cache that have been modified. This is done automatically on important console commands such as .CW halt and .CW dump . .PP The .CW wcp process also wakes up every ten seconds and tries to copy a .CW dump block from the cache to the WORM. As long as there are .CW dump blocks to copy and there is no competition for the WORM device, the copy will continue at full speed. Whenever there is competition for the WORM or there are no more blocks to copy, then the process will sleep ten seconds before looking again. .PP The HP WORM jukebox consists of 238 disks divided into 476 sides or platters. Platter 0 is the .I A side of disk 0. Platter 1 is the .I A side of the disk 1. Platter 238 is the .I B side of disk 0. On Emelie, the main file system is configured on both sides of the first 237 disks, platters 0\-236 and 238\-474.