Hi

 

Just moved from freeNAS to unRAID.

 

I have a HP N54L with 3x3tb HDD's as storage and i currently have a 250GB HDD as a cache drive, all 7200 rpm. Wired Gigabit network with cat6 cables.

 

Without a cache i was getting around 20MB/s

With a cache im getting about 40MB/s with the occasional peak at 60MB/s

 

What kind of transfer speeds are people getting with a SSD as a cache?

 

Why is it so slow? with freeNAS i was easily getting 80MB/s and often achieving 100MB/s with no cache drive.

Parity writes maybe?

 

What kind of speeds do you achieve on average?

Without a cache you are writing directly to the shares and therefore updating parity as you go.  I'd say around 20MB/s as about right - at least thats similar to what I remember seeing before using a cache drive.

 

With a cache drive in theory it should be a simple network transfer directly to the drive.  In my case I see around 50MB/s on average to a WD green drive 5400rpm (gigabit wired).  Obviously the cabling is capable of more so I've always assumed it was the slow WD drive that was slow.

 

Would be interesting to see what other people see when transferring to a cache drive, but in theory in this case you should see the same speeds you saw previously on freeNAS.

Using dd i get +400MB/s (4GB from /dev/null). Maxing out gigabit using ethernet on my laptop and any where from 75 - 160MB/s from my ubuntu vm using 3 old laptop drives in raid0 using ZFS. Both unraid and ubuntu are running on the same Esxi host and connected via samba

I just copied a 6GB file to my array at ~100 MB/s. I am fairly sure that I am getting those speeds because I am using unRAID 6b6 with my cache drive fromatted a brtfs. FWIW, I want say that I was getting around 70 MB/s when my cache drive was reiserfs.

Thanks for the info.

 

Ive noticed quite a lot of users are using the beta, is it stable enough to move onto? I mainly use Plex and PlexConnect.

Why are the transfer speeds quicker in unRAID v6b6?