10000 rpm hard drive is shown as 7200 rpm by mkfs -m

2007-12-24 19:01:00

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Hi Managers!

We have received several brand new 18G 10Krpm hard drives. We have =
installed
them to Ultra 450. Everything looked okay. But, when I ran mkfs utility =
with -m parameter
I got the following output:

# mkfs -m /dev/dsk/c1t6d0s6
mkfs -F ufs -o =
nsect=3D248,ntrack=3D19,bsize=3D8192,fragsize=3D1024,cgsize=3D22,free=3D1=
,rps=3D120,
nbpi=3D8238,opt=3Dt,apc=3D0,gap=3D0,nrpos=3D8,maxcontig=3D128 =
/dev/dsk/c1t6d0s6 35349424

The lines above tell me that rmp is equal to 120*60=3D7200 (rps*60). Is =
it right? I think it is=20
not possible to change rpm from software level, it is "hard-coded" to =
the drive.=20

The drive is Seagate Cheetah 18G:
Vendor: SEAGATE
Product: ST318203LSUN18G
Revision: 034A

Shall I do newfs with rps parameter in order to achieve 10000rpm?

TIA
Mikhail V Zdorovenko

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<BODY bgColor=3D#c0c0c0>
<DIV><FONT face=3DArial size=3D2>Hi Managers!</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>We have received several brand new 18G =
10Krpm hard=20
drives. We have installed</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>them to Ultra 450. =
Everything looked okay.=20
B</FONT><FONT face=3DArial size=3D2>ut, when I ran mkfs utility with -m=20
parameter</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>I got the following =
output:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>#  mkfs -m =
/dev/dsk/c1t6d0s6<BR>mkfs -F ufs -o=20
nsect=3D248,ntrack=3D19,bsize=3D8192,fragsize=3D1024,cgsize=3D22,free=3D1=
,rps=3D120,</FONT></DIV>
<DIV><FONT face=3DArial =
size=3D2>nbpi=3D8238,opt=3Dt,apc=3D0,gap=3D0,nrpos=3D8,maxcontig=3D128=20
/dev/dsk/c1t6d0s6 35349424</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>The lines above tell me that rmp is =
equal=20
to 120*60=3D7200 (rps*60). Is it right? I think it is </FONT></DIV>
<DIV><FONT face=3DArial size=3D2>not possible to </FONT><FONT =
face=3DArial=20
size=3D2>change rpm from software level, it is "hard-coded" to the =
drive.=20
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>The drive is Seagate Cheetah =
18G:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>    Vendor:  =20
SEAGATE<BR>    Product: =20
ST318203LSUN18G<BR>    Revision: 034A</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Shall I do newfs with rps parameter in =
order to=20
achieve 10000rpm?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>TIA</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Mikhail V =
Zdorovenko</FONT></DIV></BODY></HTML>

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10000 rpm hard drive is shown as 7200 rpm by mkfs -m

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