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hlhp_verehan
 Post subject: Can I create raid 5 staring with 2hdd?
PostPosted: October 8th, 2021, 7:57 
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Joined: October 8th, 2021, 7:50
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Location: taiwan
From my understating, raid 5 allow 1 hdd failure.

If I have an old 8TB hdd, I want to increase volume without erase the data.

Can I get another 2 new 8TB hdd, then create raid 5 with 2 new hdd, than copy the data from my old hdd, finally erase the old hdd and add the old hdd to the raid 5?
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Arch Stanton
 Post subject: Re: Can I create raid 5 staring with 2hdd?
PostPosted: October 9th, 2021, 10:00 
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Joined: May 13th, 2019, 7:50
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Location: Nederland
Nope...

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einstein9
 Post subject: Re: Can I create raid 5 staring with 2hdd?
PostPosted: October 10th, 2021, 3:30 
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Joined: May 13th, 2010, 11:17
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hlhp_verehan wrote:
From my understating, raid 5 allow 1 hdd failure.

If I have an old 8TB hdd, I want to increase volume without erase the data.

Can I get another 2 new 8TB hdd, then create raid 5 with 2 new hdd, than copy the data from my old hdd, finally erase the old hdd and add the old hdd to the raid 5?


Minimum 3 drives to create RAID5
but you can do RAID1 mirror with 2 drives

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fzabkar
 Post subject: Re: Can I create raid 5 staring with 2hdd?
PostPosted: October 10th, 2021, 5:04 
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Create a virtual RAID 5 in DMDE using 2 physical drives and a NULL disk. Copy Sectors from the old 8TB drive to the virtual RAID. Then you will have a degraded RAID. I'm not sure how you would proceed from here, though.

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hlhp_verehan
 Post subject: Re: Can I create raid 5 staring with 2hdd?
PostPosted: October 10th, 2021, 10:45 
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Joined: October 8th, 2021, 7:50
Posts: 2
Location: taiwan
Thank you for the replies.
I am running out of space, so RAID1 is not my option.
After checking DMDE, it is a bit complicated, I afraid I messy up my data.
I think I just using Symbolic link to workaround for now.
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alpy
 Post subject: Re: Can I create raid 5 staring with 2hdd?
PostPosted: October 11th, 2021, 10:50 
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Joined: October 9th, 2021, 9:56
Posts: 11
Location: Hungary
The same thing mentioned by @fzabkar can be done using mdadm under linux, if you are OK with software raid. But that will be way more complicated.
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