Replace all contractions with their normal form.
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@ -20,7 +20,7 @@
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</author>
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</authorgroup>
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<pubdate>$FreeBSD: doc/en_US.ISO8859-1/articles/storage-devices/article.sgml,v 1.1 2001/07/13 22:30:40 murray Exp $</pubdate>
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<pubdate>$FreeBSD$</pubdate>
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<abstract>
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<para>This article talks about storage devices with FreeBSD.</para>
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@ -282,7 +282,7 @@
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Instead, it has device drivers that talk directly to the
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hardware.</para>
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<para><emphasis>So: don't use spare sectoring, bad block remapping
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<para><emphasis>So: do not use spare sectoring, bad block remapping
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or whatever it may be called by the controller manufacturer when
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you want to use the disk for FreeBSD.</emphasis></para>
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</sect3>
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@ -876,7 +876,7 @@ disk wd3 at wdc1 drive 1</programlisting>
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invent. One of the most common mistakes is for people with
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wide-SCSI host adapters to connect devices on all three connecters
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(external connector, internal wide connector, internal narrow
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connector). Don't do that. It may appear to work if you are
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connector). Do not do that. It may appear to work if you are
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really lucky, but I can almost guarantee that your system will
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stop functioning at the most unfortunate moment (this is also
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known as <quote>Murphy's law</quote>).</para>
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@ -925,7 +925,7 @@ disk wd3 at wdc1 drive 1</programlisting>
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own on-board BIOS. During system startup, the SCSI BIOS takes
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over the hard disk interface routines from the system BIOS. To
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fool the system BIOS, the system setup is normally set to No hard
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disk present. Obvious, isn't it?</para>
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disk present. Obvious, is it not?</para>
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<para>The SCSI BIOS itself presents to the system a so called
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<emphasis>translated</emphasis> drive. This means that a fake
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@ -1565,12 +1565,12 @@ Mar 29 21:16:37 yedi /kernel: st1: Archive Viper 150 is a known rogue </screen>
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7,200RPM drives of one or two model generations ago. The number
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to find on the spec sheet for bandwidth is <quote>internal data
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(or transfer) rate</quote>. It is usually in megabits/sec so
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divide it by 8 and you'll get the rough approximation of how much
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divide it by 8 and you will get the rough approximation of how much
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megabytes/sec you can get out of the drive.</para>
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<para>(If you are a speed maniac and want a 10,000RPM drive for your
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cute little PC, be my guest; however, those drives become
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extremely hot. Don't even think about it if you don't have a fan
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extremely hot. Do not even think about it if you do not have a fan
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blowing air <emphasis>directly at</emphasis> the drive or a
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properly ventilated disk enclosure.)</para>
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@ -1582,7 +1582,7 @@ Mar 29 21:16:37 yedi /kernel: st1: Archive Viper 150 is a known rogue </screen>
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lower average seek times, but also the rotational delay is one
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place where slow-spinning drives can never beat a faster one.
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(The average rotational latency is half the time it takes to
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rotate the drive once; thus, it's 3 milliseconds for 10,000RPM
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rotate the drive once; thus, it is 3 milliseconds for 10,000RPM
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drives, 4.2ms for 7,200RPM drives and 5.6ms for 5,400RPM drives.)
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Latency is seek time plus rotational delay. Make sure you
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understand whether you need low latency or more accesses per
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@ -1614,7 +1614,7 @@ Mar 29 21:16:37 yedi /kernel: st1: Archive Viper 150 is a known rogue </screen>
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<para>Most SCSI drives sold today are of 3.5" form factor. They
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come in two different heights; 1.6" (<quote>half-height</quote>) or
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1" (<quote>low-profile</quote>). The half-height drive is the same
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height as a CDROM drive. However, don't forget the spacing rule
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height as a CDROM drive. However, do not forget the spacing rule
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mentioned in the previous section. If you have three standard
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3.5" drive bays, you will not be able to put three half-height
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drives in there (without frying them, that is).</para>
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<para>On the other hand, if you need to connect many drives, going
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for Fast-wide SCSI may not be a bad idea. That will have the same
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max bandwidth as Ultra (narrow) SCSI, while electronically it's
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max bandwidth as Ultra (narrow) SCSI, while electronically it is
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much easier to get it <quote>right</quote>. My advice would be: if
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you want to connect many disks, get wide SCSI drives; they usually
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cost a little more but it may save you down the road. (Besides,
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if you can't afford the cost difference, you shouldn't be building
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if you can not afford the cost difference, you should not be building
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a disk array.)</para>
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<para>There are two variant of wide SCSI drives; 68-pin and 80-pin
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SCA (Single Connector Attach). The SCA drives don't have a
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SCA (Single Connector Attach). The SCA drives do not have a
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separate 4-pin power connector, and also read the SCSI ID settings
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through the 80-pin connector. If you are really serious about
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building a large storage system, get SCA drives and a good SCA
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