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DSM 7.2 Maximum number of drives per RAID

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3
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DS1823xs+, DS220+, RS3618xs, RS3617xs, DS916+, RS812+
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This is from the Synology Knowledge Center:
On Synology NAS models that support RAID Group, there can be multiple RAID arrays in a RAID 5, RAID 6, or RAID F1 storage pool.
RAID arrays belonging to the same storage pool will be of the same RAID type, which means RAID 5, RAID 6, or RAID F1.
The maximum number of drives for each RAID array can be 6, 12, 16, 20, or 24. You can set the maximum number of drives while creating the storage pool, and the number cannot be modified later.
When a RAID array has been assigned with the maximum number of drives, the next drive added to the storage pool may be assigned to a new RAID array. The new RAID array must contain the minimum number of drives required for that specific RAID type (i.e., three drives for RAID 5 and RAID F1, and four drives for RAID 6).

What if we expand from RAID 1 to RAID5, what will be the maximum drive number per RAID?

Do we have the opportunity to set the maximum number of RAID to 12?

I'm planning to expand my RAID1 currently with two disk arrays, to a RAID6 with eight disk arrays.
 
Update/Resolution: Even though on the RAID1 it says the maximum number of drives per RAID is pre-set to 4, upon expanding to RAID5, I was given the option to set the maximum number of drives per RAID, so I set it to 12 as I got 8 bay NAS, fulfilling my requirements.
 
the Synology RAID 1 limit is 2 drives for (RAID 1 is not mentioned in your quoted excerpt).
Well, It's possible but, it's very inefficient so, maybe therefore it's not mentioned ?
2024-08-26_11-51-46.webp


I found this WiKi: RAID 1 consists of an exact copy (or mirror) of a set of data on two or more disks; a classic RAID 1 mirrored pair contains two disks
 
Synology uses a variant of RAID 1 on partition level for the system.
Each disk has this partition redundancy to be able to take out disks.
 
That's really a known variant.
My comments was on this statement:
AFAIK, the Synology RAID 1 limit is 2 drives for (RAID 1 is not mentioned in your quoted excerpt).
 
On the calculator and read in Wiki.
 
Last edited:
Telos says: All right mr. imalwaysright
Are you teasing/bickering again? Forgotten this Topic at the end ????
I guess you don't like me but, let everyone be themselves......
 
Let me remind everyone once again of this: Guide - Ignore user

Please stop with this behaviour. This is a discussion board. If anyone wants to help, please reply and offer concrete solutions. It does no one any good to be redirected elsewhere and reminded, for example, that there is Google.

To be supportive, help users who may be beginners and may ask questions that some may even find silly, with detailed explanations and useful information.

I don't want to be clever and moralistic, as we are all adults, but I do want to see an end to this kind of behaviour on the forum. Again, use the Ignore button.

Thank you for your understanding.
 
Not that this is relevant for this post or in general, but just for fun. It is possible to make RAID1 with more than two disks on synology . See this reddit posts.
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View: https://www.reddit.com/r/synology/comments/17v4zvf/reduce_number_of_drives_in_raid1_from_4_to_2/

I have seen more-than-2 disk-raid1 more often (worked in a nuclear facility) in cases where up-time was of critical importance and even the risk of 3 disk failure was considered unacceptable. Nowadays they probably use fall over systems.:)
 
Last edited:
In Synology DSM we can have up to four disks in RAID1. Giving a total of four three disk fault tolerance.
 
Last edited:
Giving a total of four disk fault tolerance.
I believe that "four disk fault tolerance" would require at least 5 drives.

... and it's RAID F1, not RAID 1
🏎️
 
I believe that "four disk fault tolerance" would require at least 5 drives.

... and it's RAID F1, not RAID 1
🏎️
Four disks total, with three disks fault tolerant.
 
I mentioned RAID1 🪞🐢, and no one here discussed RAID F1 🏁🏎️.
 
I mentioned RAID1 🪞🐢, and no one here discussed RAID F1 🏁🏎️.
I think this all goes back to the original Synology text passage you included in post #1. It only mentions RAID F1 not RAID 1. But you have only talked about ‘1’.

You included in the text ‘RAID group’ and this is the crux… this is only regarding NAS that support RAID groups. Having found this in the Storage Manager help under Create a Storage Pool, it isn’t discussing single RAID storage pools but grouped RAIDs. The NAS that support groups is a subset od devices and at the higher end: which some of yours might be.

If you haven’t seen this then I hope it’s helpful.
 
My bad, I must have copied something else before pasting. To avoid confusion, here it is:
Screenshot 2024-08-29 at 9.52.56 AM.webp
 
TBH I hadn't noticed RAID groups mentioned before, not having a NAS that supports them, so it seems an easy mistake to make. I knew some NAS models don't support SHR, at the higher end, and, I'm making a leap here to say that, it looks like NAS that don't support SHR do support RAID groups... and vice versa.

So back to your original question about migrating between RAID types... the number of drives per RAID depends on whether your NAS supports RAID groups, or not. With a migration of RAID type my assumption would be that the new RAID type dictates the permissible number of drives going forward. I cannot check but, it would appear from the knowledgebase articles that there is the ability to set [change?] the maximum number of drives in the RAID group. When this becomes available I don't know.
 

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