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Best way to Migrate 5.5TB of Data

post #1 of 6
Thread Starter 
Whats the best way to Migrate 5.5TB of data. I need to which the raid6 with 8x1TB drives to raid6 with 6x2TB Drives. Is there anyway to safely backup the data. I dont have an extra perc Controller to create a new array.
post #2 of 6
...I'm not sure how raid6 works, but is quite obvious you need a buffer storage. You just have to copy your data on some disks that either aren't part of any array (present or future) or on some disks that can be removed without data loss from the current array or (third option) you don't need to add all the 6x2TB drives from the very beginning. Anyway you need to gather as much disk space as possible to copy data from the current 8x1 array and then copy them back on the 6x2.

My 2 cents
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post #3 of 6
Thread Starter 
Can you recommend me a good application to copy the data?
Quote:
Originally Posted by dragosmp View Post
...I'm not sure how raid6 works, but is quite obvious you need a buffer storage. You just have to copy your data on some disks that either aren't part of any array (present or future) or on some disks that can be removed without data loss from the current array or (third option) you don't need to add all the 6x2TB drives from the very beginning. Anyway you need to gather as much disk space as possible to copy data from the current 8x1 array and then copy them back on the 6x2.

My 2 cents
post #4 of 6
Quote:
Originally Posted by dragosmp View Post
...I'm not sure how raid6 works
It is exactly like RAID5 but with two parity blocks instead of one..

Quote:
Originally Posted by elec999 View Post
Whats the best way to Migrate 5.5TB of data. I need to which the raid6 with 8x1TB drives to raid6 with 6x2TB Drives. Is there anyway to safely backup the data. I dont have an extra perc Controller to create a new array.
Does your motherboard have an onboard RAID controller with 6 ports?

This method will ensure you have a copy of data after the transfer:
8x1TB RAID on PERC -> 3x2TB RAID0 on Onboard -> 3x2TB RAID0 on PERC -> 6x1TB on Onboard -> 6x2TB on PERC


The other way is risker but faster....
Expand the existing array with the additional 2TBs HDDs.
Then tell array to deallocate the 1TBs.
Expand the existing array with the additional 2TBs HDDs.
Then tell array to deallocate the rest of the 1TBs.
Then migrate the existing RAID to RAID6.
Edited by DuckieHo - 4/6/11 at 6:42am
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post #5 of 6
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
It is exactly like RAID5 but with two parity blocks instead of one..


Does your motherboard have an onboard RAID controller with 6 ports?

This method will ensure you have a copy of data after the transfer:
8x1TB RAID on PERC -> 3x2TB RAID0 on Onboard -> 3x2TB RAID0 on PERC -> 6x1TB on Onboard -> 6x2TB on PERC


The other way is risker but faster....
Expand the existing array with the additional 2TBs HDDs.
Then tell array to deallocate the 1TBs.
Expand the existing array with the additional 2TBs HDDs.
Then tell array to deallocate the rest of the 1TBs.
Then migrate the existing RAID to RAID6.
Problem no more space for drives on the perc.
post #6 of 6
If you can't locate a expander, I would go with DuckieHo's first method, though he might not have explained it clearly enough for you, based on your response.

This is what you will do:

1. Create a RAID0 from the Intel motherboard RAID, using 3 of your new 2TB drives.
2. Copy your existing data from the 8x 1TB RAID6 on the PERC to the 3x 2TB RAID0 on the motherboard.
3. Destroy the 8x 1TB RAID6 on the PERC.
4. Create a RAID0 on the PERC using the other three 2TB drives.
5. Copy your existing data from the 3x 2TB RAID0 on the motherboard to the 3x 2TB RAID0 on the PERC.
6. Destroy the 3x 2TB RAID0 on the Intel motherboard RAID.
7. Create a RAID0 on the Intel motherboard RAID, using 6x 1TB drives.
8. Copy your existing data from the 3x 2TB RAID0 on the PERC to the 6x 1TB RAID0 on the motherboard.
9. Destroy the 3x 2TB RAID0 on the PERC.
10. Create a 6x 2TB RAID6 on the PERC.
11. Copy your existing data from the 6x 1TB RAID0 on the motherboard to the 6x 2TB RAID6 on the PERC.

As you'll note, the data gets copied four times, which is going to take you quite a while, but even that will probably be faster than locating a SAS expander.
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