how do I replace existing CachePool SSDs with new (larger) SSDs?

[cholzer]

Hi!

 

Currently I run 6.11.5 with a cachepool that consists out of 2x Samsung_SSD_970_EVO_1TB - so I have a total of 2TB for the cache pool.
I am running docker, vm's and one smb share on the cachepool.

Now I want to replace these 2x 1TB ssd's with 2x 4TB ssd's (and this time configure the pool to be redundant) - but I could not find a step by step guide that explains the process.

(Note: I can physically add the 2 new 4TB drives to the system so I could spin up a 2nd pool if that is required for the process.)

Ideally I want this to be a hardware swap only where I just copy the data from the old to the new CachePool and docker, vm's as well as shares just work after. 😅

Any help would be highly apprechiated! 

Edited February 3, 2023 by cholzer

[JorgeB]

First you'd need to convert the pool to raid1, assuming the current data would still fit, then you can upgrade one device at a time.

[cholzer]

1 minute ago, JorgeB said:

First you'd need to convert the pool to raid1, assuming the current data would still fit, then you can upgrade one device at a time.

Well, I can make it fit by moving some files away.
So I can just take the array offline and switch the CachePool from Raid0 to Raid1 without losing data? 😮

[JorgeB]

1 minute ago, cholzer said:

So I can just take the array offline and switch the CachePool from Raid0 to Raid1 without losing data? 😮

No need to take it offline:

https://forums.unraid.net/topic/46802-faq-for-unraid-v6/?do=findComment&comment=480421

 

[cholzer]

1 hour ago, JorgeB said:

No need to take it offline:

https://forums.unraid.net/topic/46802-faq-for-unraid-v6/?do=findComment&comment=480421

 

 

okay, I eventually found the option. 😅

 

So I:
1.convert the cache pool to RAID1
2.shut down unraid
3.replace ONE of the 1TB cache pool drives with a new 4TB drive

4.start unraid and add the newly installed 4TB to the pool replacing the now missing 1TB drive
5.let it resync the RAID1 cache pool
6.shut down unraid
7.replace the SECOND 1TB cache pool drive with the 2nd new 4TB drive
8.start unraid and add the newly installed 4TB to the pool replacing the now missing 2nd 1TB drive
9.let it resync the RAID1 cache pool

Question:
will I then end up with a 1TB cache pool?
or does it scale the size to the full 4TB automatically?

Edited February 3, 2023 by cholzer

[JorgeB]

1 hour ago, cholzer said:

will I then end up with a 2TB cache pool?

With two 4TB drives will result in a 4TB raid1 pool.

[cholzer]

22 minutes ago, JorgeB said:

With two 4TB drives will result in a 4TB raid1 pool.

So the new cache pool will automatically use the entire capacity of the new 4TB ssds once both are replaced. nice!
Thank you very much!