After format SDD disk 3.8tb with UD I ve got formated disk at 1tb !

[Keint]

Hello,

 

I recently bought 3 SSD disk from samsung SAMSUNG MZ7LM3T8HMLP-00005 3.8tb

I check everyday with DRIVEDX on Mac, healthy was looking good.

I instal the drives on my server, format them with Unassigned Devices Plus and now I ve got 1tb on all the disks ! 

I put back the drives on Mac and now I ve got a FIRMWARE VERSION: ERRORMOD ...

I try on PC, same same and I can t format them again ! 
I m totally stuck ...

 

I m looking for any idea and helps ! 

Thanks 

 

tower-diagnostics-20220619-0026.zip

[Keint]

After using this method:

http://www.cokll.com/archives/25/

 

I get back the full size of the SSDs but Preclear isn t able to clean the disk

 

I ve got this error:

 

 

Any idea? 😬

 

Thanks !

[trurl]

It isn't recommended to run preclear on SSDs. Why would you even want to?

[trurl]

Do you know that SSDs in the parity array cannot be trimmed and can only be written at parity speed?

[Keint]

Hello, 

 

thank you for your answer ! 

I finally get them back and run well ...

I use to pass by preclear for all my disque before to setup for the pool

 

My parity drive are seagate ironwolf 8tb x 2 

 

So you mean it s kind of useless to use SSDs in my serveur ?

I only have SSD as a pool and HDD as parity, isn't a good way to make it work fast? 

 

"Do you know that SSDs in the parity array cannot be trimmed and can only be written at parity speed?"

Actually I didn't know ... 😅

You mean PARITY SSD can't be trimmed but the SSD in the pool can ? 

 

I use Unraid only for PLEX, so I don t write a lot on the SDD only to copy movies, the ssd disk montly use for read data ... 

 

What do you suggest  ? Better to use regular HDD, in the pool and for the parity?

 

 

Thanks a lot for your help !

 

 

 

[itimpi]

7 minutes ago, Keint said:

So you mean it s kind of useless to use SSDs in my serveur ?

I only have SSD as a pool and HDD as parity, isn't a good way to make it work fast? 

SSDs in the pools is typical.

 

8 minutes ago, Keint said:

You mean PARITY SSD can't be trimmed but the SSD in the pool can

Any SSD in the main array cannot be trimmed (data or parity).  SSDs in pools can be trimmed.

[trurl]

On 6/19/2022 at 6:03 AM, Keint said:

Better to use regular HDD, in the pool and for the parity?

I think you are using the word "pool" differently than is meant with Unraid. Disks in the parity array are referred to as array disks.

 

The usual place for SSDs is in pools outside the parity array. Cache is a pool named "cache". You can have multiple pools of multiple disks, and name them as you wish.

https://wiki.unraid.net/Manual/Storage_Management#Pool_.28cache.29_Operations

[Keint]

1 hour ago, trurl said:

I think you are using the word "pool" differently than is meant with Unraid. Disks in the parity array are referred to as array disks.

 

The usual place for SSDs is in pools outside the parity array. Cache is a pool named "cache". You can have multiple pools of multiple disks, and name them as you wish.

https://wiki.unraid.net/Manual/Storage_Management#Pool_.28cache.29_Operations

 

 

Yep yep you totally right

thanks for the tips 😅

 

When I said pool I meant the ssds in the array ...

 

I read many many post about Unraid and SSD, I understood that there is no trim with the array.

 

But I don t really understand the real risk. 

 

I have array with 2 HDD as parity disk.

 

and 6 ssds + 2 HDD + 2 HDD for parity .

 

I use Unraid only for Plex, so I don t write a lot fo date on the SDDs, only when I had movies, so mainly to ''read'' datas.

 

So the risk is the SSDs crashes and lost the data ? And the parity won't work to rescue the data, is it right ?

 

 

 

Thanks a lot ! 

[trurl]

On 6/18/2022 at 8:16 PM, trurl said:

Do you know that SSDs in the parity array cannot be trimmed and can only be written at parity speed?

What I said has nothing to do with whether SSDs are protected by parity.