Hi, jludwig, More than 95% hard drives are from Maxtor, they support UDMA5 (burst speed at 100MB/s), or some even UDMA6 (133MB/s). The main PCI chipset is Intel 82801BA, which can support PCI at 33MB/s, with "133MB/s Maximum throughput". Formerly I specify "idebux=66" parameter to kernel when system boot, but it doesn't help. The sustainable PCI speed is still about 33MB/s. So, I don't think "idebux=133" is quite helpful under this situation. There should be some limitation somewhere, for my case, maybe the Intel Chipset 82801BA is the bottleneck? Thanks. --Guolin Cheng -----Original Message----- From: jludwig [mailto:wralphie@xxxxxxxxxxx] Sent: Friday, April 30, 2004 3:14 PM To: For users of Fedora Core releases Subject: Re: disk problems or false alarm?? On Fri, 2004-04-30 at 17:14, Alexander Dalloz wrote: > Am Fr, den 30.04.2004 schrieb Guolin Cheng um 22:54: > > > > My only concern is, I have been using "hdparm -d1 -c3 -m16 -a16 -A1 -u1 -W1 -k1 -K1 > > " command on all 4 PATA hard drives, to speed up disk access speed, and improve > > machines' responsiveness. All other options seems OK except "-u1", which, according > > to manual, may bring "massive filesystem corruption" (Although for 3 years I have seen > > no file system corruptions because of that). But if I don't enable the options, the Linux > > boxes will response way slow to keyboard when high-speed data transfer happens. > > > Guolin Cheng > > Well, forcing such agressive settings like you did is often cause for > trouble. I don't wonder any more. You did not mention such > non-selfdetected settings in your first mail. Communication between the > hard drive and the motherboard hardware using the chipset specific > driver is critical. In most every case you should let the kernel > autodetect the drives settings and not force things. > > Alexander I might add that I see nothing about bus speed. The default for linux has been 33Mhz for IDE systems (adding idebus=133 quadruples drive speed). I don't know about your system's maximum bus speed or your drives. -- jludwig <wralphie@xxxxxxxxxxx> -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: http://www.redhat.com/mailman/listinfo/fedora-list
