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NAME

disk - RAID disk configuration control commands

SYNOPSIS

disk fail disk_name

disk remove disk_name

disk scrub start

disk scrub stop

disk swap

disk unswap

DESCRIPTION

The disk fail command forces a file system disk to fail; the disk remove command unloads a spare disk so that you can physically remove the disk from the filer. The disk scrub command causes the filer to scan disks for media errors. If a media error is found, the filer tries to fix it by reconstructing the data from parity and rewriting the data. Both commands report status messages when the operation is initiated and return completion status when an operation has completed.

The filer's ``hot swap'' capability allows removal or addition of disks to the system with minimal interruption to file system activity. Before you physically remove or add a SCSI disk, use the disk swap command to stall I/O activity. After you removed or added the disk, file system activity automatically continues. If you should type the disk swap command accidentally, or you choose not to swap a disk at this time, use disk unswap to cancel the swap operation and continue service.

If you want to remove or add a fibre channel disk, there is no need to enter the disk swap command.

Before you swap or remove a disk, it's a good idea to run syconfig -r to verify which disks are where.

USAGE

disk swap
applies to SCSI disks only. It stalls all I/O on the filer to allow a disk to be physically added or removed from a disk shelf. Typically, this command would be used to allow removal of a failed disk, or of a file system or spare disk that was prepared for removal using the disk fail or disk remove command. Once a disk is physically added or removed from a disk shelf, system I/O will automatically continue.

NOTE: It is important to issue the disk swap command only when you have a disk that you want to physically remove or add to a disk shelf, because all I/O will stall until a disk is added or removed from the shelf.

disk unswap undoes a disk swap command, cancels the swap operation and continues service.

disk fail disk_name
removes the specified file system disk from the RAID configuration, spinning the disk down when removal is complete. disk fail is used to remove a file system disk that may be logging excessive errors and requires replacement.

Note that when a file system disk has been removed in this manner, the RAID group to which the disk belongs will enter degraded mode (meaning a disk is missing from the RAID group). If a spare disk at least as large as the disk being removed is available, the contents of the disk being removed will be reconstructed onto that spare disk.

The disk being removed is marked as ``broken'', so that if it remains in the disk shelf, it will not be used by the filer as a spare disk, and if it is moved to another filer, it will not be used by that filer as a spare disk.

disk remove disk_name
removes the specified spare disk from the RAID configuration, spinning the disk down when removal is complete. You can use disk remove to remove a spare disk so that it can be used by another filer (as a replacement for a failed disk or to expand file system space).

disk scrub start
starts a RAID scrubbing operation on all RAID groups. The raid.scrub.enable option is ignored; scrubbing will be started regardless of the setting of that option (the option is applicable only to scrubbing that gets started periodically by the system).

disk scrub stop
stops a RAID scrubbing operation.

SEE ALSO

na_sysconfig(1)

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