Decent SATA/SAS slog options?

[gawainx]

I'm currently using an Intel optane for a slog which is working pretty well, but I would like to add a 10gbe nic and I'm trying to avoid adding a second CPU (required for additional slots) as even idle it has a noticably different power draw.

I'd like to switch to 10gbe as I've been mazing out the current 3x 1gbe uplinks but that's require I remove the optane.

Would the performance of SAS or sata ssds such as the Intel dcs3700 create a bottleneck and cause the write speed the worse then what it is currently?

 

[ChrisRJ]

I suggest "ZIL and SLOG" and "10 Gbps primer" from the recommended readings in my signature.

As to your question, how should we be able to answer this without numbers?

 

[HoneyBadger]

Have you forced sync on your iSCSI workload? Your NFS exports will automatically leverage the SLOG device but the iSCSI LUNs won't unless explicitly told to, so check with that first.

But if you're doing small recordsize workloads (eg: virtualization) then you'll see a significant drop in performance going to DC S3700 from Optane, even a "consumer" 800p. Newer SAS such as the WD DC SS530 or Toshiba PX04 write-intensive may help but those won't come cheap.

 

[gawainx]

I should note that I currently have 3 sas/SATA bays available. I know that the SAS spees is 6

Have you forced sync on your iSCSI workload? Your NFS exports will automatically leverage the SLOG device but the iSCSI LUNs won't unless explicitly told to, so check with that first.

But if you're doing small recordsize workloads (eg: virtualization) then you'll see a significant drop in performance going to DC S3700 from Optane, even a "consumer" 800p. Newer SAS such as the WD DC SS530 or Toshiba PX04 write-intensive may help but those won't come cheap.

I moved away from ISCSI to NFS 4.1 as it gives me more flexibility. I'll see how well I can get by on 350 MB/s bandwidth for the time being.

 

[gawainx]

I figured out that I can get a daughtercard that has 2 SFP+ and 2 1gb base t connectors to replace the existing 4x 1gb base t card.. This will let me use SFP+ and a PCIE slot without having to install another CPU.