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January 23rd, 2023 07:00
Max SSD Speed - PowerEdge R720 with H710 Mini Raid Controller
Hello,
I would like to replace the SAS hard drives with SSDs. I was wondering what maximum read/write speed is supported by the Raid Controller and is there a way to fully use faster SSDs?
I Think that a maximum of 600 Mbyte/s can be used, that would be a shame.
Thanks,
Max
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vishvajitd
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March 3rd, 2023 05:00
The Dell PowerEdge R720 with an H710 Mini Raid Controller has a maximum throughput of 6Gbps per drive. However, the actual performance you will get with SSDs will depend on several factors, such as the specific model of SSD, the number of drives in the RAID array, the RAID level used, and the workload on the server.
The maximum theoretical speed of a single SATA III SSD is around 600MB/s for both read and write operations. However, some SSDs with faster interfaces, such as NVMe, can offer much higher speeds.
To fully utilize faster SSDs, you may need to consider upgrading the RAID controller to one that supports higher speeds, such as the H710P or H810. Additionally, you may need to consider using RAID levels that provide better performance, such as RAID 0 or RAID 10, but keep in mind that these RAID levels do not provide redundancy and can increase the risk of data loss in case of drive failure.
It's also worth noting that SSDs can significantly improve the overall performance of the server, even if the maximum speed supported by the RAID controller is lower than the SSD's theoretical maximum speed.
HeMan321
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March 3rd, 2023 06:00
Hello, This is a timely question and I have a R620 with a H710 Mini and have just upgraded to some faster SSDs. I have 4 disks in the server now, two SATA HDs (ST2000LM015) in a mirror and two SAS SSDs (KPM5XVUG960G and PX02SMF020) in non-RAID. The server feels slow and I noticed a SQL DB running on it is just slow compared to other servers.
So I have run a disk benchmark which shows all three drives maxing out with a read speed of about 130MB/s. The SSDs should be much faster than this, but even if not, surely the SATA drive should be much slower than them?
Also, if I copy a large file between any combination of the drives, they all manage about the same 125MB/s according to the Windows file-copy chart thing. Oddly, if I then copy the same file again between any of the disks it then runs at about 600MB/s.
Why am I not seeing the performance you would expect on SAS (6gb/s) with an SSD?