Date: Tue, 15 Mar 2011 15:50:33 -0400 From: Mehmet Erol Sanliturk <m.e.sanliturk@gmail.com> To: freebsd_user@guice.ath.cx Cc: freebsd-questions@freebsd.org Subject: Re: IDE -- mount partitions for better performance Message-ID: <AANLkTik8%2B6RtKOKyWpGQXHi1V2iAKrc5XDUKVqDkVQ4k@mail.gmail.com> In-Reply-To: <5ab7e13805185464a4adf0c5d326671e.squirrel@wtp1.ath.cx> References: <8a6023db5a3d4c8b34161f7ee0af29bb.squirrel@wtp1.ath.cx> <201103151041.56373.erich@alogreentechnologies.com> <5ab7e13805185464a4adf0c5d326671e.squirrel@wtp1.ath.cx>
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On Tue, Mar 15, 2011 at 3:17 PM, <freebsd_user@guice.ath.cx> wrote: > Annotated below ... > > > Hi, > > > > On Tuesday 15 March 2011 07:00:30 freebsd_user@guice.ath.cx wrote: > >> freebsd-questions@freebsd.org > >> > >> Guidance with the following: > >> > >> We are limited to Support for ATA-100/66/33 IDE and ATAPI compliant > >> devices. With that said, we have our atapi/33 optical on a add in > >> controller (PCI) and are seeking to place four HDD=E2=80=99s on the ma= in boards > >> controllers. Our dilemma is where to place /, /tmp, /usr and /var fro= m > >> a > >> performance standpoint. We understand that /var does quite a bit of > >> writing and probably should go on the master hdd, but what about the > >> /usr, > >> /tmp and root? Hell, I=E2=80=99m not sure my thinking is sane as to w= here I > >> =E2=80=98think=E2=80=99 /var should be placed/mounted. > >> > > > > did I get it right? You have four hard disks? > > Yes, four separate HDD's > > > > > If so, place /, /var /tmp on indiidual drives. Make the fourth disk usr > > and mount the remaining space of the other three disks inside /usr/home= . > > Are you suggesting something similar to: > > /dev/ad4s1a for / > /dev/ad4s2a for /tmp > /dev/ad4s3a for /usr > /dev/ad4s4a for /var > > If so, my initial can current concern is which device (hdd) from the abov= e > list/configuration, should be connected to which cable connector (master > or slave)? --depending on how much writing to a particular device is > taking place; for instance during a 'build world' or while building > anything from src. there is quite a bit of writing going on. I would > think that making the disk/slice that is being written to a slave would > decrease performance when the master to that slave is also being written > to simultaneously. In such a case the slave would need to wait until the > master is done writing before the slave would be able to write; Is my > thinking on this sane? > > Please enlighten me/us. > > Thank you. > > > > Locate then stuff on the other three disks which you expect to be used = in > > parallel with the /usr disk. > > I'm lost on the above suggestion; not understanding this. > > > > Of course, you can mount it anywhere else if you want. > > > > Erich > > > > > > > When four IDE hard disks are usable , then there should be at least two IDE connectors on the main board . IDE cables have two connectors ( connectors near to each other ) . The oute= r connector is for MASTER , the INNER connector is for SLAVE . IDE hard disks have JUMPERS to set the MASTER and SLAVE hard disks , and it is very likely that on the hard disk , information about jumper settings ar= e printed . When there is no such information printed , it is possible that i= t is printed in its manual , or it may be available from its producer web sit= e . MASTER hard disk should be connected to outer connector , SLAVE hard disk should be connected to INNER connector . Then , the computer will identify these hard disks with respect to connecto= r on the main board , and MASTER and SLAVE settings of the hard disks . Then , it will list them as /dev/ad1... , /dev/ad2... , /dev/ad3... , /dev/ad4... , or other ad(Numbers) depending on mother board IDE ports settings ( there may be add-on IDE cards ) , or installer may label them differently . If the hard disks are different from each other , it is easy to identify which disk is detected as which device . ( Installer will list information about their sizes ( and , perhaps trade marks ) . ) Assume that all of the hard disks are the same . Then , it is very likely that the connector slot 0 will be detected first , and the connector slot 1 will be detected as second . To be exactly sure , the following steps may be applied . ( Absolutely power down the computer for hardware modifications ) : ( Record detected connected device names . ) ( On the mother board , slot numbers or letters may be printed explicitly . ) Disconnect connector in IDE slot 1 and detect disks in connector in IDE slo= t 0 . Then , disconnect connector in IDE slot 0 and connect IDE slot 1 connector and detect disks in IDE slot 1. Then , connect connector in IDE slot 0 and detect all of the disks . After obtaining exact device names of the hard disks , final installation may be performed . Thank you very much . Mehmet Erol Sanliturk
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