All,

 

For some reason I'm getting slow transfer speeds to my Cache SSD. It's currently downloading at 2.5 MB/s on 150Mb/s connection. When I transfer files from my desktop to the cache it transfers at a max speed of 30MB/s and both computer are using SSDs over a gigabit network. I've tried different network cables, I've tried swap the cables between the two computers. Tried swaping the SATA cable, swapped SATA cable to another port on the motherboard. When I look at the SSD settings, it says it's in 6Gb/s mode...but I just can not explain these slow writes and reads...Anyone know where else I can look to try and determine the issue?

If you're not trimming your ssd install the dynamix ssd trim plugin.

This is a brand new SSD. Fresh out the box. I got a replacement since I didn't know if I had exceeded the write cycles on the previous one.

Then it's probably faulty or you have some cable/interface issues, test it on another PC or post the diagnostics.

Then it's probably faulty or you have some cable/interface issues, test it on another PC or post the diagnostics.

 

I've already tested on another computer. I'm either thinking it's UnRaid or maybe the motherboard. I've swapped SATA cables, SATA ports on Mortherboard, network cables, network switch ports, switched to add-in intel NIC...etc.

 

Here's the diagnostics.

 

https://drive.google.com/open?id=0B8lgQW0Jm7TiOEJHVnRibVhQekk

 

Also, here's a screenshot of the hdparm test.

 

No one has any other ideas?

Have you tried eliminating the network? That can help narrow down the problem. Copy from one of the other drives on your server using mc (Midnight Commander) or the command line.

 

Also, do network transfers to other disks on your server seem to be OK? If not that would indicate a network issue instead.

 

Try different ways of copying files so that you eliminate as many components as possible for each test so you can narrow it down.

I hope you have better luck than I do tracking down slow read or write performance. I've been chasing it for years on my server

Have you tried eliminating the network? That can help narrow down the problem. Copy from one of the other drives on your server using mc (Midnight Commander) or the command line.

 

Also, do network transfers to other disks on your server seem to be OK? If not that would indicate a network issue instead.

 

Try different ways of copying files so that you eliminate as many components as possible for each test so you can narrow it down.

 

This is from two disk that are hooked up with SATA cables from the Motherboard.

 

 

 

Then I tried in MC to perform the same copy as above.

 

 

 

Then I tried from a SATA connected disk to my desktop that has a SSD as it's drive.

 

 

 

Then I tried from a disk on my HBA (SUPERMICRO AOC-SAS2LP-MV8)

 

https://i.imgur.com/4OYMFes.png

 

 

I noticed that in the gui, my cpu utilization didn't change, which caused me to look into maybe something being wrong with the motherboard or CPU.

 

 

 

I found an article that stated write and read speed issues could be due to the CPU being in power save mode. So I tried to change the mode but it seems to just stay in power save mode.

 

 

 

Then I went and checked the 'Stats' tab and now it shows no activity on the disks. NONE OF THIS MAKES ANY SENSE!!!

 

Is the SATA controller in AHCI mode in the BIOS?

 

I have an aging Evga LGA1366 motherboard that works at full SATA II speeds with SSDs on windows, but when I converted it to ESXi (4.1 ugh...) I had horrible performance with the SSD, like what you are describing. Using mechanical drives were faster. There was no solution. After using it like that for over a year I actually just replaced it out with a dual e5 2670 MB last week.

Is the SATA controller in AHCI mode in the BIOS?

 

I have an aging Evga LGA1366 motherboard that works at full SATA II speeds with SSDs on windows, but when I converted it to ESXi (4.1 ugh...) I had horrible performance with the SSD, like what you are describing. Using mechanical drives were faster. There was no solution. After using it like that for over a year I actually just replaced it out with a dual e5 2670 MB last week.

 

My server is a Z97 build with a Intel 4790k Processor. I don't think that would be a bottleneck.

Is the SATA controller in AHCI mode in the BIOS?

 

I have an aging Evga LGA1366 motherboard that works at full SATA II speeds with SSDs on windows, but when I converted it to ESXi (4.1 ugh...) I had horrible performance with the SSD, like what you are describing. Using mechanical drives were faster. There was no solution. After using it like that for over a year I actually just replaced it out with a dual e5 2670 MB last week.

 

My server is a Z97 build with a Intel 4790k Processor. I don't think that would be a bottleneck.

 

Yeah man, I'm using the very same platform/cpu right now to write this post. It's a great platform, but it doesn't mean it is problem free.

 

I wasn't saying your hardware is slow. I was saying that Linux has often unpredictable results and that your hardware (that you neglected to list) may be relevant. In this case, if you google the issue, you'll see several results related to poor SSD performance with Linux & Z97. Not all have the same solution, but more than one found that using a different path between the SSD and the CPU fixed the problem. In one case, it wasn't plugged into an Intel port, in another the user moved his SSD onto a PCIe card (removing the storage controller entirely) and fixed the issue. Yet another found that FS journaling was the cause of poor performance.

 

 

 

So: A lot of Z97 platforms came with an ASmedia SATA controller paired with the Intel one. Is your SSD plugged into an Intel port? Is NCQ disabled?

Is the SATA controller in AHCI mode in the BIOS?

 

I have an aging Evga LGA1366 motherboard that works at full SATA II speeds with SSDs on windows, but when I converted it to ESXi (4.1 ugh...) I had horrible performance with the SSD, like what you are describing. Using mechanical drives were faster. There was no solution. After using it like that for over a year I actually just replaced it out with a dual e5 2670 MB last week.

 

My server is a Z97 build with a Intel 4790k Processor. I don't think that would be a bottleneck.

 

Yeah man, I'm using the very same platform/cpu right now to write this post. It's a great platform, but it doesn't mean it is problem free.

 

I wasn't saying your hardware is slow. I was saying that Linux has often unpredictable results and that your hardware (that you neglected to list) may be relevant. In this case, if you google the issue, you'll see several results related to poor SSD performance with Linux & Z97. Not all have the same solution, but more than one found that using a different path between the SSD and the CPU fixed the problem. In one case, it wasn't plugged into an Intel port, in another the user moved his SSD onto a PCIe card (removing the storage controller entirely) and fixed the issue. Yet another found that FS journaling was the cause of poor performance.

 

 

 

So: A lot of Z97 platforms came with an ASmedia SATA controller paired with the Intel one. Is your SSD plugged into an Intel port? Is NCQ disabled?

 

Lol, that's so irritating. It's been working 100% for the last 2 years...up until about 4 months ago it started giving me isses. I can't answer your questions until I get home and look at it but I will report back.