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# Managing Disks in a C Series Controller

The SRC CLI provides commands to let you monitor disk status, replace faulty disks, and reinitialize disks in the system.

## Replacing or Swapping a Disk

You can replace a failed disk or swap a working disk in a C Series Controller. Note the following limitations:

- Replacing a disk— You can replace it while the other disk remains active.
- Swapping a disk—You cannot remove both disks in the C Series Controller at the same time. Do not power down the system or initialization errors may occur.

To replace or swap a disk:

1. Disable the disk.
   `
   user@host> request disk disable device 0 | 1
   `

   | Note: Do not power down the C Series Controller when you are swapping a disk, because doing so might result in initialization errors.

2. Remove the disk from the system.
3. Insert a new disk.
4. Enable the disk.
   `
   user@host> request disk enable device 0 | 1
   `
5. Initialize the new disk.
   `
   user@host> request disk initialize device 0 | 1
   `

   The command generates data on the disk that enables the disk controller to manage the disk. The disk controller copies data from the other disk and establishes mirroring between the two disks.

6. Verify that the disk is initialized.
   `
   user@host> show disk status
   `

## Reinitializing an Active Disk

You can reinitialize a disk that is already active in a C Series Controller.

To reinitialize a disk:

- Initialize the disk.
  `
  user@host> request disk initialize device 0 | 1 force
  `

  The command generates data on the disk that enables the disk controller to manage the disk. The disk controller copies data from the other disk and establishes mirroring between the two disks.

## Viewing Information About Disks on a C Series Controller

To view information about disks in the C Series Controller:

- Enter the show disk status command.

`

user@host> show disk status

`

    ----------------------------------------------------------------------
    Controller information
    ----------------------------------------------------------------------
       Controller Status                   : Optimal
       Channel description                 : SATA
       Controller Model                    : Adaptec 2020SA
       Controller Serial Number            : BAD0
       Physical Slot                       : 2
       Installed memory                    : 64 MB
       Copyback                            : Disabled
       Background consistency check        : Disabled
       Defunct disk drive count            : 0
       Logical devices/Failed/Degraded     : 1/0/0
       ---------------------------------------------------
       Controller Version Information
       ---------------------------------------------------
       BIOS                                : 4.2-1 (7387)
       Firmware                            : 4.2-1 (7387)
       Driver                              : 1.1-5 (2449)
       Boot Flash                          : 0.0-0 (0)
       ---------------------------------------------------
       Controller Battery Information
       ---------------------------------------------------
       Status                              : Not Installed

    ----------------------------------------------------------------------
    Logical device information
    ----------------------------------------------------------------------
    Logical device number 1
       Logical device name                 : SRC-PE
       RAID level                          : 1
       Status of logical device            : Optimal
       Size                                : 70857 MB
       Read-cache mode                     : Enabled
       Write-cache mode                    : Disabled (write-through)
       Write-cache setting                 : Disabled (write-through)
       Number of chunks                    : 2
       Drive(s) (Channel,Device)           : 0,1 0,0

    ----------------------------------------------------------------------
    Physical device information
    ----------------------------------------------------------------------
       Channel #0:
          Transfer Speed                   : SATA 3.0 Gb/s
          Device #0
             Device is a Hard drive
             State                         : Online
             Transfer Speed                : SATA 1.5 Gb/s
             Reported Channel,Device       : 0,0
             Reported Enclosure,Slot       : 0,0
             Vendor                        : WDC
             Model                         : WD740ADFD-00NLR5
             Firmware                      : 21.0
             Serial number                 : WD-WMANS1972929
             Size                          : 70911 MB
             Write Cache                   : Unknown
             FRU                           : None
             S.M.A.R.T.                    : No
          Device #1
             Device is a Hard drive
             State                         : Online
             Transfer Speed                : SATA 1.5 Gb/s
             Reported Channel,Device       : 0,1
             Reported Enclosure,Slot       : 0,1
             Vendor                        : WDC
             Model                         : WD740ADFD-00NLR5
             Firmware                      : 21.0
             Serial number                 : WD-WMANS2000570
             Size                          : 70911 MB
             Model                         : WD740ADFD-00NLR5
             Firmware                      : 21.0
             Serial number                 : WD-WMANS2000570
             Size                          : 70911 MB
             Write Cache                   : Unknown
             FRU                           : None
             S.M.A.R.T.                    : No
          Device #14
             Device is an Enclosure
                Type                       : SAF-TE
                Vendor                     : QLogic
                Model                      : GEM424
                Firmware                   : 0101
             Status of Enclosure
                Temperature status         : Normal

    Command completed successfully.
       Current operation              : None

    Command completed successfully.

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