Hello. We mistakenly deleted the logical drive of our Pegasus2 R8 within the Pegasus Utility. The physical drives are untouched, and the array is still active/untouched. Is there a simple way to restore the logical drive that was setup in RAID 5?
Thanks!
Unfortunately, when you delete a logical drive, all the data on the logical is lost and cannot be restored. it is always advisable to back up any important data before situation like this arises.
Thanks! Forgive me but I have a modest amount of knowledge with backup systems and know that 'all data is lost' is a blanket statement that might not be entirely accurate. My question was, is there a an easy way to retore the RAID (using terminal/CLI or simlar)? It sounds like perhaps no?
And if its ok... What does the data recovery process look like if we wanted to explore that route?
Thanks for your help!!
Unfortunately, There is no way to restore the RAID using terminal/CLI.
Thank you for the quick reply!
Is it possible to use third party data recovery? What does that look like?
You can try to use third party recovery if possible; however you delete a logical drive, all the data on the logical is lost and cannot be restored.. You can refer to data recovery services like Drivesavers Data Recovery for further assistance.
Hi Tim,
When a LUN is deleted the data on disk is not touched. The array information is stored in something called DDF at the very end of each array disk. The DDF is all that is deleted (when an array is deleted) or modified (if only the LUN is deleted). If a deleted LUN is re-created, the volume will be restored. Data recovery services are needed primarily when there is a disk failure of a critical disk.
That being said, we'd need to know the configuration of the original LUN to recreate it. Many users change the factory default configuration.
And recreating the LUN will have to be done from the terminal.
Were any changed made to the default configuration of your Pegasus?
Hi RP
Thanks for your response!
The Pegasus2 R8 was set up as a RAID5 with the default settings. It was configured on a mac using the promis utility.
The logical cache policy was set to ReadAhead/WriteBack (Not sure if this variable matters?)
Thanks!
Hi Tim,
If everything is in the default configuration, then the process should be...
1. open a terminal
2. enter 'promiseutil' to start the CLI.
3. To recreate the LUN, use the following command...
array -a addld -d 0 -l "raid=5,forcesynchronized=yes"
4. The Volume should mount on the MAC, verify that your files are present.
5. If no files are present that means the LUN was not successfully recreated, delete the LUN immediately.
Hi RP
That worked perfectly!
THANK YOU
Hi Tim,
Fantastic.
- Hi Tim and thanks for your post.
- Special thanks and question for RP - what can I do if I have same situation but when I run recreation of my LUN I got the message that I have no free space: "Error (0x8020): not enough free space on the disk array"
I'm thinking about to delete one hard drive that is as spare, but not sure if it can help me extending my RAID 0 ...
Any suggestions are welcome.
Many thanks in advance!
Hi Mihai,
Can you run the following commands in promiseutil and post the output here?
phydrv
array -v
logdrv -v
Hi R P,
Many thanks for so quick reply.
cliib>phydrv ===============================================================================
PdId Model Type Capacity Location OpStatus ConfigStatus
===============================================================================
1 TOSHIBA DT01 SATA HDD 3TB Encl1 Slot1 OK Unconfigured
2 TOSHIBA DT01 SATA HDD 3TB Encl1 Slot2 OK Array0 No.0
3 TOSHIBA DT01 SATA HDD 3TB Encl1 Slot3 OK Array0 No.1
4 TOSHIBA DT01 SATA HDD 3TB Encl1 Slot4 OK Array0 No.2
5 TOSHIBA DT01 SATA HDD 3TB Encl1 Slot5 OK Array0 No.3
6 TOSHIBA DT01 SATA HDD 3TB Encl1 Slot6 OK Array0 No.4
7 TOSHIBA DT01 SATA HDD 3TB Encl1 Slot7 OK Array0 No.5
8 TOSHIBA DT01 SATA HDD 3TB Encl1 Slot8 OK Array0 No.6
cliib>array -v
-------------------------------------------------------------------------------
DaId: 0
OperationalStatus: OK
Alias: Promise2
PhysicalCapacity: 21TB ConfigurableCapacity: 21TB
FreeCapacity: 0Byte MaxContiguousCapacity: 0Byte
AvailableRAIDLevels: 0 5 6 50 1E
PDM: Enabled MediaPatrol: Enabled
NumberOfPhysicalDrives: 7 NumberOfLogicalDrives: 1
NumberOfDedicatedSpares: 0
UserSetPowerSavingLevel: 0 CurrentPowerSavingLevel: 0
PowerManagement: Enabled
Physical Drives in the Array:
===============================================================================
SeqNo PdId CfgCapacity FreeCapacity OpStatus
===============================================================================
0 2 3TB 3.09MB OK
1 3 3TB 3.09MB OK
2 4 3TB 3.09MB OK
3 5 3TB 3.09MB OK
4 6 3TB 3.09MB OK
5 7 3TB 3.09MB OK
6 8 3TB 3.09MB OK
Logical Drives in the Array:
===============================================================================
LdId Alias RAIDLevel Capacity OpStatus
===============================================================================
0 Promise RAID0 21TB OK
Available Spares to the Array:
===============================================================================
Id OpStatus PdId CfgCapacity Revertible Type DedicatedToArray
===============================================================================
No spare drive available in the array
cliib>logdrv -v
-------------------------------------------------------------------------------
LdId: 0
ArrayId: 0 SYNCed: Yes
OperationalStatus: OK
Alias: Promise TRIMSupport: Support TRIM
SerialNo: 0000000000000000000000002C0AEEFC362DB09B
WWN: 2287-0001-55e1-8a28 PreferredCtrlId: N/A
RAIDLevel: RAID0 StripeSize: 1MB
Capacity: 21TB PhysicalCapacity: 21TB
ReadPolicy: ReadAhead WritePolicy: WriteBack
CurrentWritePolicy: WriteBack
NumOfUsedPD: 7 NumOfAxles: 1
SectorSize: 512Bytes RAID5&6Algorithm: N/A
TolerableNumOfDeadDrivesPerAxle: 0 ParityPace: N/A
CodecScheme: N/A
Hi Mihai,
According to the posted information your RAID0 LUN is online and functional.
I'm thinking about to delete one hard drive that is as spare, but not sure if it can help me extending my RAID 0 ...
First, there is no spare on your Pegasus. And a RAID0 LUN can't use a spare, you'd need a RAID5 or RAID6. RAID0 is risky as if any drive dies the LUN is lost.
If the Volume won't mount, open Disk Utility and run First Aid on it, the RAID volume is fine, there has to be Filesystem damage.
First Aid was first tried, and repeted a few times, spare I did deleted before running promiseutil commands ... now I just added it back and run again same commands:
cliib> phydrv
===============================================================================
PdId Model Type Capacity Location OpStatus ConfigStatus
===============================================================================
1 TOSHIBA DT01 SATA HDD 3TB Encl1 Slot1 OK Revert Global Sp
2 TOSHIBA DT01 SATA HDD 3TB Encl1 Slot2 OK Array0 No.0
3 TOSHIBA DT01 SATA HDD 3TB Encl1 Slot3 OK Array0 No.1
4 TOSHIBA DT01 SATA HDD 3TB Encl1 Slot4 OK Array0 No.2
5 TOSHIBA DT01 SATA HDD 3TB Encl1 Slot5 OK Array0 No.3
6 TOSHIBA DT01 SATA HDD 3TB Encl1 Slot6 OK Array0 No.4
7 TOSHIBA DT01 SATA HDD 3TB Encl1 Slot7 OK Array0 No.5
8 TOSHIBA DT01 SATA HDD 3TB Encl1 Slot8 OK Array0 No.6
cliib> array -v
-------------------------------------------------------------------------------
DaId: 0
OperationalStatus: OK
Alias: OLD_P2
PhysicalCapacity: 21TB ConfigurableCapacity: 21TB
FreeCapacity: 0Byte MaxContiguousCapacity: 0Byte
AvailableRAIDLevels: 0 5 6 50 1E
PDM: Enabled MediaPatrol: Enabled
NumberOfPhysicalDrives: 7 NumberOfLogicalDrives: 1
NumberOfDedicatedSpares: 0
UserSetPowerSavingLevel: 0 CurrentPowerSavingLevel: 0
PowerManagement: Enabled
Physical Drives in the Array:
===============================================================================
SeqNo PdId CfgCapacity FreeCapacity OpStatus
===============================================================================
0 2 3TB 3.09MB OK
1 3 3TB 3.09MB OK
2 4 3TB 3.09MB OK
3 5 3TB 3.09MB OK
4 6 3TB 3.09MB OK
5 7 3TB 3.09MB OK
6 8 3TB 3.09MB OK
Logical Drives in the Array:
===============================================================================
LdId Alias RAIDLevel Capacity OpStatus
===============================================================================
0 OLD_P RAID0 21TB OK
Available Spares to the Array:
===============================================================================
Id OpStatus PdId CfgCapacity Revertible Type DedicatedToArray
===============================================================================
0 OK 1 3TB Yes Global
cliib> logdrv -v
-------------------------------------------------------------------------------
LdId: 0
ArrayId: 0 SYNCed: Yes
OperationalStatus: OK
Alias: OLD_P TRIMSupport: Support TRIM
SerialNo: 0000000000000000000000002C0AEEFC362DB09B
WWN: 2287-0001-55e1-8a28 PreferredCtrlId: N/A
RAIDLevel: RAID0 StripeSize: 1MB
Capacity: 21TB PhysicalCapacity: 21TB
ReadPolicy: ReadCache WritePolicy: WriteBack
CurrentWritePolicy: WriteBack
NumOfUsedPD: 7 NumOfAxles: 1
SectorSize: 512Bytes RAID5&6Algorithm: N/A
TolerableNumOfDeadDrivesPerAxle: 0 ParityPace: N/A
CodecScheme: N/A
Thanks for info and help
Hi MiHai,
A spare is useless when you have a RAID0. If any drive dies the RAID is lost. There is no parity data in a RAID0 with which to rebuild to the spare. We caution against using RAID0 as it is not redundant and all will be lost on (1) drive failure. We ship all Pegasus units with a pre-built RAID5.
Can you explain what the issue is again? I'm not seeing anything wrong from the data posted.
Hi,
There were no hardware problems on Pegasus. My issue is that I have no volume - it has Uninitialised status. I did found that it was ejected, I did unplugged and plugged back and it was already with uninitialised status.
Thanks for trying understand my problem.
Hi Mihai,
My issue is that I have no volume - it has Uninitialised status.
I've already responded to this issue.
If First Aid does not work, you may need Disk Warrior, it's not a free program but it will recover damaged filesystems that First Aid cannot. NOTE: Disk Warrior only works with HFS+ filesystems, if you have any other filesystem, do not use Disk Warrior.
