By cmdx2 ·
I am trying to convert RAID 1 to RAID 5 without losing my data. Is there a way to convert/reconfigurate my RAID without formating, reinstalling and configurating all the software? Thanks in advance!

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We need MORE information

by cmiller5400 In reply to RAID 1 TO RAID 5 CONVERSI ...

What mfr of RAID are you using. Is in onboard, or a card? Is it software based raid?

Most likely it is going to be a wipe the array, and rebuild. You may be able to ghost the machine to just restore the data/os partitions, but good practice is backup, backup, then backup again for good measure.

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by ugadata In reply to RAID 1 TO RAID 5 CONVERSI ...

The only way not to lose your data is to back it up first.

Now, when you say "data" do you mean installed programs, the installed OS, and data created/stored by existing programs? If so you'll need some kind of image backup software (as compared to a file backup software) at least for partition containing the OS.

Is the RAID being implemented in software or is it hardware (I hope it is implemented in hardware, makes life much simpler).

I doubt there is any way to do an in-place conversion from RAID 1 to RAID 5.

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by cmdx2 In reply to Backup


This is where I am at: I basically want to keep the data on the server and do the conversion with HP ACU.
I am aware I can break the mirror (backup, backup, backup) and configure from HW however at this point
I would prefer to use the ACU. I value any suggestions provided, Thanks.

Here is some info :
HP ProLiant DL G4
hw - Smart Array 6i Controller - onboard
sw - ACU

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by CCallalou In reply to RAID 1 TO RAID 5 CONVERSI ...
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Reponse To Answer

by DomBenson In reply to X

Yes - the HP ACU (array configuration utility) and hpacucli support doing this. It is called Online RAID Level Migration, and it is referred to in the ACU user guide:
You should be sure to have a backup first, and it is strongly recommended to have the BBU/FBWC upgrade - some of the Smart Array controllers simply won't do ORLM if this isn't present.

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How to convert RAID1 to RAID 1+0

by chris2mop In reply to RAID 1 TO RAID 5 CONVERSI ...

You said " I want to add two more disk same capacity and same model."
I can suggest you to add same capacity disks,but NOT same model: in case of disk defect, you can crash several disks in a relative short time (may be several disks at the same time). I have experimented this problem in a raid 5 array and thanks to backup i could recover my data. the array was dead (2disks).

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Reponse To Answer

by DomBenson In reply to How to convert RAID1 to R ...

The risk with using different models is that, rather than reducing the impact of defects, you increase the chance that you will be affected by them, as you are exposed to two sources.
It can also make performance worse, as the RAID controller has to accommodate the lowest common denominator for each operation.
To reduce the risk of multiple failures occurring in a short window, periodically migrating between hot spares can help, as is causes all the disks to have different wear profiles. Staying on top of SMART data (for SATA drives) is also a must!

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Probably Not Possible

by info In reply to RAID 1 TO RAID 5 CONVERSI ...

I'm inclined to agree with UGAData on this. The one piece of data we're missing to be sure is how many drives we're talking about in the RAID1 source and RAID5 target arrays. For instance:
Your source array is RAID1 with two drives. If you add an additional drive to the system this may be possible, as it could keep it's original data on the single drive while populating the other disks with data, once finished, it could stripe the data with the parity information and complete the RAID5 migration.

I have a number of those G4s (bought for $100 each! ), mostly as parts spares for one I still have in operation at a very small branch office. Don't know if a Battery pack is required for RAID5 on servers that old like it is on newer ones. Ideally, the focus should be taking that server out of production and replacing it with a newer one, if you have the funding.

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