rprohask@orion.oac.uci.edu (Robert Prohaska) (04/05/91)
What are the appropriate parameters for newfs when setting up a seagate ST4385NM (wren runner) disk? The partition is about 250 Mbytes, slice 3. While were're at it, what's the difference between /dev/dsk/c6d0s3 (the partition I want to use) and /dev/rdsk/c6d0s3? thanks bob
jim@jagubox.gsfc.nasa.gov (Jim Jagielski) (04/05/91)
In article <27FBFA5C.17898@orion.oac.uci.edu> rprohask@orion.oac.uci.edu (Robert Prohaska) writes: } }While were're at it, what's the difference between /dev/dsk/c6d0s3 (the }partition I want to use) and /dev/rdsk/c6d0s3? } Well, /dev/dsk/c6d0s3 is the BLOCK device for that particular partition. That is, read and writes will be done (mostly) on a block basis. Usually when dealing with files, you want to use this device; that's why you mount the BLOCK device. However, there is another way to "talk" to this partition: character by character. This is the /dev/rdsk/c6d0s3 partition, which stands for the RAW device for that partition. newfs and fsck work better and faster when accessing the RAW device. Also notice that such utilities as cpio and tar should be used with the RAW device; that is output goes to rdsk not dsk (or rfloppy0 and not floppy0). Generally, the rule of thumb is to use RAW for all file system utilities and applications that are character/stream based (hence cpio). The BLOCK device is the partition mounted. -- =========================================================================== #include <std/disclaimer.h> =:^) Jim Jagielski NASA/GSFC, Code 711.1 jim@jagubox.gsfc.nasa.gov Greenbelt, MD 20771 "I object to all this sex on the television. I mean, I keep falling off!"
alexis@panix.uucp (Alexis Rosen) (04/06/91)
rprohask@orion.oac.uci.edu (Robert Prohaska) writes: >What are the appropriate parameters for newfs when setting up a >seagate ST4385NM (wren runner) disk? The partition is about 250 Mbytes, >slice 3. That disk is the only non-Apple disk supported by /etc/disktab. Instead of telling newfs about cylinders and tracks and whatnot, just tell it the disk type is 'MN330'. >While were're at it, what's the difference between /dev/dsk/c6d0s3 (the >partition I want to use) and /dev/rdsk/c6d0s3? One is a character device, the other is block. Try ls -l on each to see. --- Alexis Rosen Owner/Sysadmin, PANIX Public Access Unix, NY {cmcl2,apple}!panix!alexis