Buy list HCL SATA or SAS SSD?  Why the consumer grade SATA SSD are meaningless.

Hello

I run a node 4 VSAN 6 Cluster with a LSI SAS in Raid-0 Mode controller listed HCL (a 975 queue depth) to which I currently attached: 3 x 10 k SAS Enterprise RPM hard drives and 1 x Samsung 850 SATA Pro 512 GB SSD. The nodes are the same.

These SSD is due to budgetary constraints. I too put in service the SSD 512 GB to 400 GB and they seem to controllers and BIOS as 400GO devices.

Performance is horrible. Overall, VM feel morose.

When you make a copy of a file of DVD ISO file (say 3GB) on one virtual computer to another, I get extremely high 100 MS to 300ms or even higher disk latencies on both virtual machines. When a regeneration occurs because I take a node in Maint.mode with 'full datamigration', or I re - apply a strategy of backup to say "band bandwidth 2" to "stripe-width 3", the whole cluster crushed essentially to a halt. " VM has become so slow and on Linux VM I get same kernel-messages on scsi timeouts, etc. None of the work of the virtual machine, they freeze and basically die because "the disc is extremely unresponsive.

I'm not alone in this. I have read many similar stories on the net and it often comes down to the 'consumer grade SATA SSD' who these Samsungs are after all.

I guess I have the same problem.

My question is this: I have the right to replace the Samsung 850 Pro with either a SAS disk SSD Sandisk which is listed HCL * or * using Intel DC S3700 SATA SSD that are also in the HCL currently for 6 VSAN.

What I don't understand is: ' if the SATA SSD that I use currently, form a bottleneck due to the depth of the SATA Interface of 32 queue, how can we * all * SATA SSD be on the HCL at all?

I doubt that these Intel DC S3700 are much faster than the Samsung 850 Pro and they are two SATA drives and they both have a personal 32 queuedepth and all the interface SATA has a 32 port queuedepth pro. So how can disks SATA works in a system of VSAN. I just makes no sense.

Everyone is to fight to death on "queue-depth queue depth queue depth. Cormac Hogan, Duncan Epping, everyone who is an authority on VSAN. A queue-depth too low controllers were thrown out of the HCL etc etc etc

When I look at the SSD Intel S3700 HCL wrote:

Mandatory features:Drive performance, disc reliability, queue depth, SMART SATA Surprise Power Removal, trim attributes / Unmap, Cache write, write the NDR

It says "tail-depth" as one of the requirements that responds to this SDS. But SATA, by definition, has a maximum queue-depth 32 which is much too small. So, how can it meet "tail-depth"? It is SATA!

The Intel DC S3700 would cost me about half of the money the SAS SSD Sandisk and of course, if Intel is going to solve my problems of performance, then I'll take those. But if I'm just as much trouble afterwards because of the queue depth of the SATA Interface of 32, then I better invest in the SAS SSD (but which could exhaust my budget for other things so I'd rather not).

Anyone can shed some light on this?

(edit: I changed the title to better reflect my findings)

Update: I bit the bullit, obtained a second mortgage, said my child may not be able to go to College and I bought the SAS SSD (Sandisk 200 GB 6 G SAS). In each of the four nodes, I did a complete data migration, replaced the Samsung 850 Pro SATA SSD with the SSD SAS and macaroni holy, all my problems disappeared.

The whole system feels much more receptive and do things like clone a virtual machine (which would grind the whole cluster to stop) never stops working like nothing happens.

Before, when I did a simple copy of an ISO to a virtual computer DVD file to another, I would like to get, maybe, 20 MB/s and the entire cluster has started feeling lethargic until the copy job is completed. Now, I get speeds ranging from 80 to 90 MB/s and so bright and responsive.

What a difference!

I'm a very happy man.

Moreover, my network is a 1 Gbps where each node has two NIC in a LACP LAG and I can clearly see a node to talk to another network node 1 NIC and talk to another node on the other card NETWORK LACP nicely splits the traffic on the two cards.

The system feels so fast now and reconstructions / present a new application of storage policies is difficult to have an impact, and generally occur much more quickly than before.

And really, the only thing I did was swap the Samsung 850 Pro SATA SSD with these SAS SSD.

Lesson learned: either pay the money of the SAS SSD (which are on the HCL, of course) who is the best, or get certified company VSAN grade SATA SSD but STAY AWAY to consumers rank of SATA SSD because they do not have what it takes. They cannot empty their queues fast enough and all clutter as soon as there is a bit of the system load.

Just don't do it. Forget the consumer SATA rank. It's like throwing money down the toilet. I've been there and I learned the hard way. Let me be the stubborn donkey, so you don't ;-)

Tags: VMware

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