SUMMARY [20 GB IDE Disk on 2.5.1]

From: sajan s <>
Date: Thu Apr 26 2001 - 08:31:56 EDT
Hi All,

Thanks Casper for pointing to Sun FAQ.

It says - OS less than 2.7 will identify the disk as 8GB only

But my requirement was to use a disk that has data (written by 2.8 OS,
wanted to connect and read in 2.5.1) which I cud not do.


--- Original Post:
> Hi,
> Can I use 20gig IDE hard disk on Ultra10 with solaris 2.5.1 running?
> If not, what is the minimum OS version supported?
> I heard SUN may stop shipping 9GB HDD's

>From FAQ *:

  Various releases of Solaris have different upper limits in the
    size of the IDE disks they support.  For SCSI, there are
    really no such limits, though older versions of format do
    not support really large raids.

    All releases support IDE disks <= 8GB; support for those
    disks is primarily a BIOS issue on Intel.

    Support for IDE disks between 8 and 32 GB was added in Solaris 
    and Solaris 8/Intel.  Note the difference in release between

    Support for IDE disks over 32 GB was added to Solaris 8 10/00
    for both SPARC and Intel.

    Solaris releases that support IDE disks upto 8GB will truncate
    larger disks to 8GB.  To use such disks to the max after upgrading
    to a later release of Solaris/SPARC requires zeroing the disk label
    with dd before relabeling it.

    Solaris releases that support disks between 8GB and 32 GB will
    truncate the disk to "real size modulo 32GB".  I.e., a 40GB or 72GB
    disk becomes a 8GB one, a 33GB or 65GB disk becomes 1GB, etc.

    SPARC/IDE systems have no OpenBoot issues with disks over 8GB
    and can boot fine from beyond the 8GB/32GB mark.

    Solaris/Intel didn't support IDE disks > 8GB until release 8;
    BIOS permitting, Solaris 8 can even boot from beyond the 8GB mark.
    Older Solaris/Intel releases have a hard time coping with such
    big disks.

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Received on Thu Apr 26 13:31:56 2001

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