Hey, On 5 May, this message from Rog�rio Brito echoed through cyberspace: > On May 05 2002, Michel Lanners wrote: >> I've recently gotten a new HD for my TiBook (40 Gig :), which makes >> relatively loud noise when moving the head. > > What is the manufacturer of your HD?
This one is a Fujitsu MHR2040AT. It's about 30% faster than the original Toshiba MK1016GAP (10Gig). Idle nois is at least as low as the Toshiba; but head movement is louder. In fact, I think it is the head assembly moving to the parking position that makes the loud 'click' noise. >> At first, it did that every five seconds, which, as you can imagine, >> is unsupportable after a few minutes. > > Indeed. The same reaction that I had. Hehe :) >> I've since tried to find what accesses the disk every five seconds, and >> come to the combination pmud with APM emulation/asapm. > > That's good. I didn't investigate what was happening, but I > guess that I'll do so when I have some spare time. It's not that easy to see what happens. I tried to find accessed/modified files with find -atime/-ctime, but that didn't show a lot... >> While we're at it, does anybody have other ideas to eliminate disk >> acceses? I've already done these: >> >> - switch back to ext2 from ext3 (ext3 prevents the HD from spinning >> down) > > I'm using ext3 (with noatime). I'll test it with ext2 to see > the effects. But read below my comments on noatime. > >> - install noflushd > > Did that already. Anybody know how noflushd's spin-down compares/interacts with what pmud does in pwrctl? >> - remount with noatime while on battery > > I always use noatime and I don't seem to have problems with > that. But I do notice that the HD spins down when I'm on > battery, even though I'm using ext3. And it stays spun down for longer periods of time? >> In particular, how about devfs? I'd suppose having devfs in memory >> saves the atime/ctime/mtime changes on the /dev FS nodes (which is >> metadata to the FS, right?)? > > Well, I do think that atime/ctime/mtime are metadata, but are > they changed for device nodes? I thought that device nodes > were special in respect to that (but I have never read any > code to support my claim). If I knew :). I'm now running devfs, without any problem so far (touch wood...). For those who want to take the plunge: enabling devfs in the kernel (but _not_ automounting it), and installing the devfsd .deb, configuring /etc/default/devfsd to do the mount, did the trick for me. > Ok, I know that I'm not helping, but I am just trying to see > the similarities between our systems. Whatever happened to that site that wanted to collect laptop-specific tips&tricks for Mac hardware? Is taht alive somewhere? Cheers Michel ------------------------------------------------------------------------- Michel Lanners | " Read Philosophy. Study Art. 23, Rue Paul Henkes | Ask Questions. Make Mistakes. L-1710 Luxembourg | email [EMAIL PROTECTED] | http://www.cpu.lu/~mlan | Learn Always. " -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
