General hardware forum

RodBarnes

Senior Member
I would like some input on drive configuration but, of course, these would not generally be Windows-specific questions. Does anyone have a favorite hardware community where I could post such a question as that below?

I am looking at disk performance in my current system and trying to determine how best to configure and arrange the drives. Currently, I have AHCI running on a mbrd that has six SATA 2 ports and a PCIe card to provide four SATA 3 ports. The drives are currently connected as shown at bottom and the performance results are pretty dismal when compared to expected values given the specs. (Yeah, I know we never reach spec, but this is really, really low.) I've included only the seq 4KiB read/write tests but the randoms are correlative to those.

Each of the SSD drives are spec'd to support up to 540 MB/s. I've read that SATA 3 should provide about 600 MB/s real-world performance. So I'm left wondering why I wouldn't see something above 500 MB/s. However, I've also read that performance from PCIe cards using Marvell chips is pretty poor -- so maybe that is the issue.

Similarly, I've read that SATA 2 provides 300 MB/s real-world performance. The HDDs attached to those ports are spec'd to provide up to 175 MB/s. So, again, trying to determine why I'm seeing less than 100 MB/s with those.

C - MBRD SATA 2 Port 0 - Samsung SSD 850 EVO 250GB; seq 4KiB read, write: 284.860 MB/s, 272.903 MB/s
I - PCIe SATA 3 Port 0 - Samsung SSD 850 EVO 500GB; seq 4KiB read, write: 204.669 MB/s, 173.793 MB/s
J - PCIe SATA 3 Port 2 - Samsung SSD 850 EVO 500GB; seq 4KiB read, write: 205.725 MB/s, 173.818 MB/s
K - PCIe SATA 3 Port 3 - Samsung SSD 850 EVO 500GB; seq 4KiB read, write: 205.771 MB/s, 173.819 MB/s
L - MBRD SATA 2 Port 1 - Samsung HDD 753LJ 750GB; seq 4KiB read, write: 82.239 MB/s, 81.245 MB/s
M - MBRD SATA 2 Port 4 - Samsung HDD 753LJ 750GB; seq 4KiB read, write: 88.062 MB/s, 81.877 MB/s
N - MBRD SATA 2 Port 5 - Samsung HDD 753LJ 750GB; seq 4KiB read, write: 93.264 MB/s, 88.237 MB/s
 


Last edited:

whoosh

Cooler King
Staff member
Premium Supporter
I would like some input on drive configuration but, of course, these would not generally be Windows-specific questions. Does anyone have a favorite hardware community where I could post such a question as that below?

I am looking at disk performance in my current system and trying to determine how best to configure and arrange the drives. Currently, I have AHCI running on a mbrd that has six SATA 2 ports and a PCIe card to provide four SATA 3 ports. The drives are currently connected as shown at bottom and the performance results are pretty dismal when compared to expected values given the specs. (Yeah, I know we never reach spec, but this is really, really low.) I've included only the seq read/write tests but the randoms are correlative to those.

Each of the SSD drives are spec'd to support up to 540 MB/s. I've read that SATA 3 should provide about 600 MB/s real-world performance. So I'm left wondering why I wouldn't see something above 500 MB/s. However, I've also read that performance from PCIe cards using Marvell chips is pretty poor -- so maybe that is the issue.

Similarly, I've read that SATA 2 provides 300 MB/s real-world performance. The HDDs attached to those ports are spec'd to provide up to 175 MB/s. So, again, trying to determine why I'm seeing less than 100 MB/s with those.

C - MBRD SATA 2 Port 0 - Samsung SSD 850 EVO 250GB; seq read, write: 284.860 MB/s, 272.903 MB/s
I - PCIe SATA 3 Port 0 - Samsung SSD 850 EVO 500GB; seq read, write: 204.669 MB/s, 173.793 MB/s
J - PCIe SATA 3 Port 2 - Samsung SSD 850 EVO 500GB; seq read, write: 205.725 MB/s, 173.818 MB/s
K - PCIe SATA 3 Port 3 - Samsung SSD 850 EVO 500GB; seq read, write: 205.771 MB/s, 173.819 MB/s
L - MBRD SATA 2 Port 1 - Samsung HDD 753LJ 750GB; seq read, write: 82.239 MB/s, 81.245 MB/s
M - MBRD SATA 2 Port 4 - Samsung HDD 753LJ 750GB; seq read, write: 88.062 MB/s, 81.877 MB/s
N - MBRD SATA 2 Port 5 - Samsung HDD 753LJ 750GB; seq read, write: 93.264 MB/s, 88.237 MB/s
I have forwarded your question to the admins.
 


Josephur

Windows Forum Admin
Staff member
Premium Supporter
Which motherboard are you using exactly?
 


kemical

Windows Forum Admin
Staff member
Premium Supporter
Thread moved to correct section.
 


RodBarnes

Senior Member
Also, I found the SSDReview site and have posted this question there.
 


RodBarnes

Senior Member
Just wrapping this up for future reference: I ended up purchasing a Syba 4 Port SATA III RAID HyperDuo PCIe 2.0 x4 Card and connecting all four SSD (including the boot drive) to that card. The HDDs were left connected to the SATA 2 ports on the motherboard. Performance is great. All of the SSDs are benchmarking at 550+ MB/s so I am very satisfied.

Side note: I originally purchased IO Crest 4 Port SATA III PCI-e 2.0 x1 Controller Card Marvell Non-Raid and tried that. But I hadn't realized that PCIe 2.0 is limited to 250 MB/s for each lane. :-( Being a x1 card and the chip is the Marvell 88SE9215 (a single-lane chip), I was seeing about 280 MB/s. The other board (listed at top) is a x4 with a Marvell 88SE9230 which is a dual-lane chip and thus gives me the 550+ MB/s.
 


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