Only getting 8GB out of a 11GB drive

Only getting 8GB out of a 11GB drive

Post by Tom Com » Wed, 25 Nov 1998 04:00:00



Hello,

  I just installed an 11GB EIDE drive (Maxtor 91152D8) into an Ultra10
  running Solaris 2.6 and can only partition an 8GB file system on it -
  format is only showing 16381 cylinders instead of the expected 22332
  cylinders:

     1. c0t1d0 <Maxtor 91152D8 cyl 16381 alt 2 hd 16 sec 63>

  Does anyone have any ideas why I can't get 11GBs out of this disk?
  What is the filesystem limit under Solaris anyway?

--

National High Magnetic Field Laboratory        Phone:  (850) 644-1657
1800 E. Paul Dirac Drive                       Tallahassee, FL 32310

 
 
 

Only getting 8GB out of a 11GB drive

Post by Jim Levi » Wed, 25 Nov 1998 04:00:00


Quote:>>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<<


regarding Only getting 8GB out of a 11GB drive:

Quote:> Hello,
>   I just installed an 11GB EIDE drive (Maxtor 91152D8) into an Ultra10
>   running Solaris 2.6 and can only partition an 8GB file system on it
-
>   format is only showing 16381 cylinders instead of the expected 22332
>   cylinders:
>      1. c0t1d0 <Maxtor 91152D8 cyl 16381 alt 2 hd 16 sec 63>
>   Does anyone have any ideas why I can't get 11GBs out of this disk?
>   What is the filesystem limit under Solaris anyway?

The problem isn't exactly a Solaris problem, but is more of an EIDE
problem. While I'm not an expert on EIDE, I believe that the spec
requires some kind of remapping/translation for drives larger than
9GB. Apparently Solaris doesn't know how to do this, hence you don't
see all the drive.

 
 
 

Only getting 8GB out of a 11GB drive

Post by gre » Wed, 25 Nov 1998 04:00:00



Quote:>  I just installed an 11GB EIDE drive (Maxtor 91152D8) into an Ultra10
>  running Solaris 2.6 and can only partition an 8GB file system on it -
>  format is only showing 16381 cylinders instead of the expected 22332
>  cylinders:
>     1. c0t1d0 <Maxtor 91152D8 cyl 16381 alt 2 hd 16 sec 63>
>  Does anyone have any ideas why I can't get 11GBs out of this disk?

You have a disk that reports its C/H/S geometry incorrectly.  A lot of
EIDE disks do this because older PeeCees have BIOSes that are confused
by sizes greater than 8GB.  SunOS 5.7 will workaround that but if
you've already labeled the disk it's a bit tricky to "unlabel" it.
It's easiest if you're running SunOS 5.7 and initially label the disk
when running SunOS 5.7... or buy disks that don't report their
geometry incorrectly (which means they'll work on SunOS 5.5.1 and
SunOS 5.6 as well).

Quote:>  What is the filesystem limit under Solaris anyway?

1 Terabyte for UFS.

-greg

 
 
 

Only getting 8GB out of a 11GB drive

Post by Bas de Bakke » Thu, 26 Nov 1998 04:00:00


Quote:>>>>> "greg" == greg  <greg> writes:

    greg> SunOS 5.7 will workaround that but if you've already labeled
    greg> the disk it's a bit tricky to "unlabel" it.

I had a similar problem recently and after some other attempts I
finally "unlabeled" the disk using something like this:

cat /dev/zero > /dev/rdsk/c1t0d0s0

(and hitting ^C after a few seconds).  Better make sure you don't do
this on the wrong disk, though.

Regards,
Bas.

 
 
 

Only getting 8GB out of a 11GB drive

Post by arborwe.. » Sun, 29 Nov 1998 04:00:00


You may have to make an entry for the drive in /etc/format.dat for the
drive. You can confirm this by doing a format command, then choose type to
see if the drive you are using is listed properly. If it isn't, try making a
manual entry into the format.dat file for this drive.

> >>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<<


> regarding Only getting 8GB out of a 11GB drive:

> > Hello,

> >   I just installed an 11GB EIDE drive (Maxtor 91152D8) into an Ultra10
> >   running Solaris 2.6 and can only partition an 8GB file system on it
> -
> >   format is only showing 16381 cylinders instead of the expected 22332
> >   cylinders:

> >      1. c0t1d0 <Maxtor 91152D8 cyl 16381 alt 2 hd 16 sec 63>

> >   Does anyone have any ideas why I can't get 11GBs out of this disk?
> >   What is the filesystem limit under Solaris anyway?

> The problem isn't exactly a Solaris problem, but is more of an EIDE
> problem. While I'm not an expert on EIDE, I believe that the spec
> requires some kind of remapping/translation for drives larger than
> 9GB. Apparently Solaris doesn't know how to do this, hence you don't
> see all the drive.

 
 
 

1. FreeBSD with >8GB drives where BIOS is restricted to <8GB

I've recently installed FreeBSD-4.3 onto an older system here that I've put
together for just this task. I'm finding that I probably want more disk
space than I currently have (~4.5GBs between two drives), and am considering
upgrading my Windows 2000 desktop with a new HD and shifting my 30GB into
the FreeBSD machine. However, the BIOS in the FreeBSD system limits me to
8GB hard drives. Is there an easy workaround for this? If it makes any
difference, I haven't decided whether I would need this drive to be
bootable, or just use it for storage space.

My apologies if this has been covered in the FAQ or elsewhere (I've looked
and haven't found anything), and thanks in advance for any help you can
provide.

Thanks,
Matt

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