SSD and speed
Posted: 2019/04/29 10:17:48
Hi everyone, am posting this to see if anyone has had the same issue and overcome it.
First of all, I am not an expert with CentOS, I have used this OS to accomplish a task and it has become the best thing we have ever done as a company.
We are using HP DL380 Gen9 and Gen10 servers with silver specification CPU, a full loaded SAS 40 tb RAID 1+0 and 2 x SSD drives as we were under the impression that the SSD drives could process our data quicker.
To cut a long story short it appears the SAS drives and the SSD drives are running at identical speeds in both real world tests and hdparm tests. We also bought NMVe drives and tried those, again the speeds were identical in CentOS 7.
At this point we thought it was the RAID card, however we bought a very meaty gaming machine (lucky me) and that also showed that the speeds of the standard SATA SSD and NMVe drives were again identical, however the faster CPU highlighted a 60% gain in this speed.
So the question is, does CentOS 7 bottleneck the speeds of SSD drives? We have tried all the suggestions of optimising the mount and have seen a few percent increase but nothing really that significant.
For the background, I used a standard partition set of 4 for the SAS drives and mounted in the SSD as Ext4. Changing the formatting or mounting method of the SSD makes no difference in our real world tests.
/boot (Ext4)
/bootefi
swap
/ (xfs)
Our system uses a lot of Disk IO, probably like no other system that uses CentOS so suggestions on how can we increase the speed would be really welcome. At the moment we are probably going to upgrade the CPUs as an easy upgrade route.
First of all, I am not an expert with CentOS, I have used this OS to accomplish a task and it has become the best thing we have ever done as a company.
We are using HP DL380 Gen9 and Gen10 servers with silver specification CPU, a full loaded SAS 40 tb RAID 1+0 and 2 x SSD drives as we were under the impression that the SSD drives could process our data quicker.
To cut a long story short it appears the SAS drives and the SSD drives are running at identical speeds in both real world tests and hdparm tests. We also bought NMVe drives and tried those, again the speeds were identical in CentOS 7.
At this point we thought it was the RAID card, however we bought a very meaty gaming machine (lucky me) and that also showed that the speeds of the standard SATA SSD and NMVe drives were again identical, however the faster CPU highlighted a 60% gain in this speed.
So the question is, does CentOS 7 bottleneck the speeds of SSD drives? We have tried all the suggestions of optimising the mount and have seen a few percent increase but nothing really that significant.
For the background, I used a standard partition set of 4 for the SAS drives and mounted in the SSD as Ext4. Changing the formatting or mounting method of the SSD makes no difference in our real world tests.
/boot (Ext4)
/bootefi
swap
/ (xfs)
Our system uses a lot of Disk IO, probably like no other system that uses CentOS so suggestions on how can we increase the speed would be really welcome. At the moment we are probably going to upgrade the CPUs as an easy upgrade route.