System Administration Guide: Devices and File Systems

What's New in Disk Management?

This section describes new disk management features in the Solaris release.

Two-Terabyte Disk Support for Installing and Booting the Solaris OS

Solaris Express Community Edition, build 99: In previous Solaris releases, you could not install and boot the Solaris OS from a disk that was greater than 1 Tbyte in size. In the SXCE build 99 release, you can install and boot the Solaris OS from a disk that is up to 2 Tbytes in size. In previous releases, you also had to use an EFI label for a disk that is larger than 1 Tbytes. In this release, you can use the VTOC label on any size disk, but the addressable space by the VTOC is limited to 2 Tbytes.

The Solaris disk drivers and disk utilities have been updated to provide the following support:

Keep in mind that you cannot move a disk over 1 Tbyte with a legacy MBR or a legacy VTOC to a previous Solaris release. EFI labeled disks continue to work as in previous Solaris releases.

For more information about the EFI label changes in this release, see EFI Disk Label.

iSNS Support in the Solaris iSCSI Target and Initiator

Solaris Express 1/08: This Solaris release provides support for the Internet Storage Name Service (iSNS) protocol in the Solaris iSCSI target and initiator software. The iSNS protocol allows for the automated discovery, management, and configuration of iSCSI devices on a TCP/IP network.

In this Solaris release, you can use the iscsitadm command to add access to an existing third-party iSNS server or you can user the Solaris iSNS server to automatically discover the iSCSI devices in your network. The iSNS server can be specified by hostname or IP address. After you add the iSNS server information, you will need to enable access to the server.

See the following resources for step-by-step instructions:

Solaris iSCSI Target Support

Solaris Express 8/06: This Solaris release provides support for iSCSI target devices, which can be disk or tape devices. Previous Solaris releases provide support for iSCSI initiators. The advantage of setting up Solaris iSCSI targets is you might have existing Fibre-Channel devices that can be connected to clients without the cost of Fibre-Channel HBAs. In addition, systems with dedicated arrays can now export replicated storage with ZFS or UFS file systems.

You can use the iscsitadm command to set up and manage your iSCSI target devices. For the disk device that you select as your iSCSI target, you'll need to provide an equivalently sized ZFS or UFS file system as the backing store for the iSCSI daemon.

After the target device is set up, use the iscsiadm command to identify your iSCSI targets, which will discover and use the iSCSI target device.

For more information, see Chapter 14, Configuring Solaris iSCSI Targets and Initiators (Tasks), iscsiadm(1M), and iscsitadm(1M).

Solaris iSCSI Initiator Support

Solaris Express 6/05: iSCSI is an Internet Protocol (IP)-based storage networking standard for linking data storage subsystems. By carrying SCSI commands over IP networks, the iSCSI protocol enables you to mount disk devices, from across the network, onto your local system. On your local system, you can use the devices like block devices.

For more information, see Chapter 14, Configuring Solaris iSCSI Targets and Initiators (Tasks).

Solaris iSCSI Initiator Support Enhancements

Solaris Express 3/06: The following enhancements have been added to the Solaris iSCSI initiator support:

For more information about configuring Solaris iSCSI initiators, see Chapter 14, Configuring Solaris iSCSI Targets and Initiators (Tasks) and iscsiadm(1M).

x86: Disk Management in the GRUB Boot Environment

Solaris Express 6/05: The GRUB boot menu has replaced the previous method for booting an x86 system. In the area of disk management, you use the GRUB interface when booting from an alternative device to replace a system disk or when installing the bootblocks.

The GRUB boot environment provides the following features:

In the GRUB environment, you cannot use the fmthard command to install the boot blocks automatically when run on an x86 system. You must install the boot blocks separately.

For detailed feature information and instructions on using the new GRUB based booting on x86 systems, see Booting an x86 Based System by Using GRUB (Task Map) in System Administration Guide: Basic Administration.

For instructions for managing disks in the GRUB boot environment, see the following references:

This feature is not available on SPARC systems.

Support for SCSI Disks That are Larger Than 2 Tbytes

Solaris Express 6/05: The SCSI driver, ssd or sd, is limited to 2 terabytes in the Solaris 10 release. Starting in the Solaris 10 1/06 release, the SCSI driver, ssd or sd, supports 2 terabytes and greater.

The format utility can be used to label, configure, and partition these larger disks. For information about using the EFI disk label on large disks and restrictions with the fdisk utility, see Restrictions of the EFI Disk Label.