Consumer SSDs

[Ronny]

Hi there,

we have 15 Consumer Samsung 1TB SSDs (850 and 860 Pro) and dont know how we can use it as well.

I tested these SSDs on our 7-Node Cluster in CEPH (3 Nodes got 5 SSDs) and on all 3 nodes the io-delay runs high.
my test was to move some VM-Harddisks to this Customer_SSD_Pool, start 3 VMs on it and run some dd write benchmarks.
normaly we have 0.1 -> 0.4 IO-Delay over all Hosts. on my tests the 3 nodes have 4-6% io-delay.

by the way: our enterprise SSDs and SAS drives do not make any io-delay on write-load

In this knowledge i dont want to run our production VMs (~300 over the whole cluster) with this.

but what can i do? can i use this SSDs in an low-speed-Pool without io-delay?
to use it on ceph-fs for backups...


any suggestions?


regards
Ronny

 

[Craig St George]

your idea to use them for non intense workload is problay a good idea
definaly dont use them for Block storeage on VM they will wear out too quicly as well in that case

 

[Ronny]

thanks for your answer
yes, i think so too - no block storage on it.
we had this SSDs on a OpenFiler NAS an with ISCSI connected to PRX-Cluster. Performance bad and high io-delay also...

so how can i use it for my cluster? build an OpenNAS and share NFS?