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RAID Level 0 / 1 or 5
Drive failure results in loss of data
in logical drives assigned RAID level 0.
This RAID level offers substantial speed enhancement, but
allows for no data redundancy, therefore, a hard disk failure within the array results in loss of data in the
logical drive assigned RAID level 0, but only in that logical drive.
RAID Level 1
supported by the IBM RAID Controller provides an enhanced feature for disk mirroring that stripes data and
copies of the data across all the drives of the array. The first stripe is the data stripe, and the second stripe
is the mirror (copy) of the first data stripe but shifted one drive.
RAID Level 5
stripes data and parity of the data across all the drives of the array. The capacity of the logical drive when assigned
level 5 is reduced by one drive (for data parity storage).
Level 5 is generally the most desirable choice because it offers both data protection and increased throughput.
Level 5 gives a higher capacity than level 1, but level 1 offers higher performance. If after using level 5 you are dissatisfied with
the performance and can tolerate lower capacity, you can either redefine the level 5 to a level 1, or you can use a logical drive
that you have assigned level 1.
Obtaining the RAID Drive Status
The following procedure enables you to see the ID, capacity, and other information
about each of the hard disk drives.
| STATUS | MEANING |
|---|---|
| RDY | Ready, the drive is recognized by the controller and is available for definition. |
| ONL | Online, the drive is part of an array. If this drive fails, logical drives defined |
| in the array in which this drive is grouped will have a status of Offline | |
| (if the logical drive is assigned RAID level 0) or Critical (if the logical drive | |
| is assigned RAID level 1 or level 5). | |
| HSP | Hot spare, the drive will replace a similar defunct drive in real time. At this time, |
| its status changes to ONL and its array association is displayed. | |
| DDD | Defunct, the drive is an online or hot-spare drive that does not respond to command. |
| (If a RDY drive is defunctional powered down, it shows an empty bay (a blank status), | |
| not a DDD drive.) | |
| OFL | Offline, the drive is a good drive that has replaced a defunct drive in a RAID level 1 or |
| level 5 array, it is associated with an array, but does not contain any valid data. | |
| UFM | Unformatted, the drive requires a low-level format before it can be used in an array. |
| (To perform a low-level format, select Format drive from the Create/Delete Array menu | |
| and follow the instructions on the screen.) | |
| FMT | Format, the drive is being reformatted. |
MESSAGES associated with the IBM SCSI-2 Fast/Wide Streaming RAID-Adapter/A.
Where the Action information tells to start the IBM RAID Configuration program, insert the RAID Configuration
diskette into the primary diskette dive (usually A) and press Ctrl+Alt+Del
(Actions should be done by CUSTOMER)
| RAID Adapter Message. | Action. |
|---|---|
| n logical drives are installed. | n represents the number of logical drives defined |
| Information only, no action required | |
| Controller cannot recover | The controller does not have a complete list of all |
| from data | pending operations from the last usage. |
| inconsistencies. | Start the IBM RAID Configuration program and |
| synchronize all logical drives. | |
| Controller firmware | The controller is not operational. |
| error. Reload firmware. | HW-error |
| Controller hardware | The controller is not operational |
| error, run RAID | HW-error |
| Controller diagnostics | |
| program. | |
| Controller is not | The controller is not operational. |
| responding to | HW-error |
| commands. No logical | |
| drives are installed. | |
| Data on critical logical | A power loss occurred when the logical drive was in |
| drive is inconsistent. | Critical state. Data is lost |
| Replace the defunct drive and re-create the data | |
| Drive identified for | A hard disk drive is installed in the wrong bay. |
| channel n bay m found | Install the drive in the correct bay, or leave it where it |
| at channel x bay y . | is and reassign it to its present bay. Data in the logical |
| drive will be lost when you reassign it to a new bay. | |
| To reassign the drive : | |
| 1. Start the IBM RAID Configuration program | |
| 2. Select Create/delete array from the Main Menu. | |
| The Bay/Array selection list will appear and you | |
| can reassign the drive. | |
| Drive in channel n bay m | The drive in this bay does not respond to commands |
| does not respond. | Insert the RAID configuration Diskette and press |
| Ctrl+Alt+Del to restart the system. A screen will | |
| appear to help you decide whether to declare the drive | |
| irrecoverable. If you declare the drive irrecoverable, | |
| start the IBM RAID Configuration program to resolve | |
| the problem. | |
| Installation stopped. | The controller cannot be accessed. |
| This message is a follow-on to a preceding message. | |
| Follow the Action instructions for the preceding | |
| message you received to resolve the problem. | |
| Irrecoverable | An error exists in the configuration data stored on the |
| configuration error, run | RAID controller. |
| Configuration program. | Restore the configuration from the Disk Array |
| Configuration Backup diskette. | |
| 1. Start the IBM RAID Configuration Program. | |
| 2. Select Advanced functions from the Main Menu, | |
| then select Restore config. from diskette. | |
| 3. Follow the instructions on the screen. | |
| If the configuration stored on your Disk Array | |
| Configuration Backup diskette is not current (or if you | |
| do not have a backup of the configuration | |
| information), have the system serviced. | |
| Irrecoverable controller | The controller is not operational. |
| error - memory parity | HW-error |
| failure. | |
| No free RAM found, no | The controller could not initialize its BIOS. |
| logical drives are | HW-error |
| installed. | |
| No logical drives found, | No logical drives are defined |
| none are installed. | Start the IBM RAID Configuration program and define |
| a logical drive | |
| RAID firmware | This is the version level. |
| version x.yy | Information only, no action is required. |
| Recoverable | An error exists in the configuration data stored on the |
| configuration error, run | controller. |
| Configuration program. | Insert the IBM RAID Controller Diskette and press |
| Ctrl+Alt+Del to restart the system. Follow the | |
| instructions on the screen. | |
| Recovery from data | Most likely cause was a sudden power loss during last |
| inconsistency is in | operation. |
| progress. | No action is required. |
| Starting drives... | The controller is starting drives in the array. |
| Information only, no action is required. | |
| Unidentified drive found | The drive in this bay is not recognized by the system. |
| in channel n bay m | Information only, the system will assign it to that bay. |
| WARNING: n logical | One or more drives have failed. |
| drives are critical, n | Replace the defunct drives as soon as possible to |
| logical drives are offline. | prevent data loss. |
| WARNING: The | The EEPROM on the controller is reaching the end of |
| firmware flash EEPROM | its life and must be replaced. |
| is failing and must be | HW-error |
| replaced. | |
| WARNING: Too many | Temporary tables in the controller are full, the |
| entries in the change list. | controller needs to be reset. |
| Reset the system to clear | Press Ctrl+Alt+Del to restart the system, then follow |
| it. | the instructions on the screen. |
| IBM RAID BIOS - | System operating in protect mode without a device |
| System in protect mode, | driver. |
| cannot continue. | Update the CONFIG.SYS file with the proper device |
| System halted. | drivers and restart the system. |
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