Messages in this thread | | | Date | Mon, 12 Jan 1998 11:20:29 +0100 | From | ralf@uni-kobl ... | Subject | Re: devfs patch v3 |
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On Mon, Jan 12, 1998 at 07:36:03AM +1100, Richard Gooch wrote:
> Pavel Machek writes: > > Hi! > > > > > > where <H> is the host controller number, <C> is the channel number, > > > > <I> is the SCSI disc ID, <L> is the LUN. > > > > For a single partition it looks like this: > > > > > > > > sd_hHcCiIlLpP > > > > > > > > where <P> is the partition number. So, for example sd_h0c0i3l0p2 > > > > corresponds to sdd2 on my system. > > > > > > Wouldn't it be better to use subdirectories as much as possible? > > > I know it will be more difficult to implement, but will make things look > > > nicer, readdir faster, etc. > > > What about > > > /dev/sd/hHcCiIlL > > > /dev/sd/hHcCiIlLpP > > > /dev/pts/N > > > /dev/scd/hHcCiIlL /* current cdrom code doesn't use partitions */ > > > ... > > > > In case of devfs, only those who are actually installed take up space > > in /dev. Is that still problem? (I would not like to have /dev > > multi-directory, because it would make manual looking for devices > > harder (by one or more chdirs).) Hmmmm. Thinking about sunsite. That > > is I believe something like 50 scsi discs, and you probably have about > > 2 devices per disc (h...lL and h...lLpP), that's about 100 entries, > > which is perfectly ok. I think that even 1000 discs would be ok > > (altrough not good), since entries are in RAM and readdirs are not > > done too much, anyway. > > You're assuming for large disc farms there are few partitions per > disc. That might not be true (maybe each user gets their own striped > partition).
Sybase wants disks partitioned in 2gb chunks when using raw devices. I've got a box with 48 disks, that sucks ... There are 43gb disks available and Solaris is limited to 7 useable partitions, so we also shouldn't limit ourselves unless we have to ...
Ralf
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