On which disk should I install the operating system?

[SrBas97]

First of all, sorry if it is not written correctly, I am using a translator.


I am a 220j user and tired of the slowness I am going to use a home server that I have (16gb, i3,8100)

 

 

My question is the following, I am going to use 2x4tb wdred for data storage.

A 2.5 250GB SSD for the cache, my question is, where is the operating system installed?

On the data disks? On the cache disks? Or should I use another separate disk for the installation?

[DSfuchs]

SSD cache doesn't work, it's also unnecessary because of mirroring. I use a 3rd drive as parity of a mega-fast RAID4 stripe.

 

Edited May 14, 2024 by DSfuchs

[SrBas97]

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Edited May 14, 2024 by SrBas97

[SrBas97]

10 minutes ago, DSfuchs said:

La caché SSD no funciona y tampoco es necesaria debido a la duplicación. Utilizo una tercera unidad como paridad de una banda RAID4 megarápida.

 

So no disk can be configured as cache?

So I install XPE on a separate disk from the data ones?

And an extra question, to make a mirror raid on two disks do I need some additional software, or does Sinology itself do it the same as with the ds220?

[DSfuchs]

2 SSDs are required for a cache, as they must be mirrored. This only makes sense if they are enterprise SSDs with SLC memory that does not wear out.
The "DSM" operating system is installed on both drives for data. You set up a RAID1 as normal, just not SHR!

Edited May 14, 2024 by DSfuchs

[DSfuchs]

There is not enough RAM in your DS220j. In addition, the CPU is too slow. The right device is the DS223j, where 2.5GbE also works via the USB port.

If the processor should be an Intel one, the DS224+ is the device of choice.

Edited May 14, 2024 by DSfuchs

[SrBas97]

I still don't know where to install the OS, whether on the data disks or on a separate disk

[DSfuchs]

52 minutes ago, SrBas97 said:

I still don't know where to install the OS, whether on the data disks or on a separate disk

You can't control this, it is written mirrored to at least the first two hard drives.

Edited May 14, 2024 by DSfuchs

[bearcat]

16 hours ago, DSfuchs said:

There is not enough RAM in your DS220j. In addition, the CPU is too slow

 

That might be some of the reasons why he wants to build a Xpenology box 

@SrBas97 
Your DSM will automaticly be installed on your "data disks", as a Raid1 mirrored across "all" of them.
The drives will get 3 separate partitions during install: 1=System (for DSM), 2=Swap, 3=Data storage, and you do not need to think about it.
If you have a singe SSD, you *can* use it for cache, but just as "read-cache", and depending of usage pattern, it might be un-useful.

[DSfuchs]

2 hours ago, bearcat said:

 

That might be some of the reasons why he wants to build a Xpenology box 

@SrBas97 
Your DSM will automaticly be installed on your "data disks", as a Raid1 mirrored across "all" of them.
The drives will get 3 separate partitions during install: 1=System (for DSM), 2=Swap, 3=Data storage, and you do not need to think about it.
If you have a singe SSD, you *can* use it for cache, but just as "read-cache", and depending of usage pattern, it might be un-useful.

Regardless of the reading pattern, reading under RAID1 has twice the performance anyway, since two hard drives offer the same content and the second read head is already delivering data even though the other one is still busy. Therefore, a read cache is quite unnecessary under RAID1/RAID10.

[DSfuchs]

Now there are trophies if only different words are written for the given answers.

[jacqlittle]

17 hours ago, bearcat said:

 

That might be some of the reasons why he wants to build a Xpenology box 

@SrBas97 
Your DSM will automaticly be installed on your "data disks", as a Raid1 mirrored across "all" of them.
The drives will get 3 separate partitions during install: 1=System (for DSM), 2=Swap, 3=Data storage, and you do not need to think about it.
If you have a singe SSD, you *can* use it for cache, but just as "read-cache", and depending of usage pattern, it might be un-useful.

+1

 

This.

[bearcat]

16 hours ago, DSfuchs said:

Therefore, a read cache is quite unnecessary under RAID1/RAID10

 

Oh... as I said, it all depends on the usecase.

On one of my "boxes", running RAID10 as a NFS fileshare for my ESXi host, and iSCSI target for its VM's, adding a SSD readcache made a BIG difference.

But, if your just using it for your mediaserver, its a waste.

 

If you have personal experience with this kind of use, positive or negative, feel free to share

Edited May 16, 2024 by bearcat