y7pro
Cadet
- Joined
- Feb 5, 2020
- Messages
- 4
Hi there ,
i have successfully built my new freenas server with the following specs
1- Dell R740 dual xeon 4114 CPU
2- 128GB RAM
3- inte x540-T2 dual 10GBe Card
4- LSI 9300-8e HBA Card
5- supermicro 847E1C-R1K28JBOD Storage enclosure
6- 16 X 12TB Seagate Exos HDD (in Enclosure)
7- 2 X Samsung 512GB pro SATA SSD(in Server)
8- 2 X Dell 600GB 15K SAS Drives (Boot Drives)
Pools Configuration:
1- 2 X 8 Disk Raidz2 Vdevs using the 12TB Drives
2- 1 X 2 SSD Disk Mirror Vdev (just for testing)
I have setup the system and its working but i have some problems with the read/ write speeds:
1- read speeda from the Raidz2 pool seems to be limited to 1GB/s whatever i try , i am testing using dd with the following command
the compression on the pool is off and no matter what i try the read speed is max 1GB/s , its seems there is a bottleneck somewhere in the system i cant identify .
Strangely enough the write speed maxes out at about 1800MB/s which is relatively within the expected performance of the pool.
2- the second problem is actually a question , the seagate exos are rated for 230MB/s sequential write speed and 170MB/s random but when i test the pool with dd which is i assume sequential and check the reporting section for the disk , every disk seems to max out at about 150MB/s which is why -i think - the max write speed is below the theoritical maximum of the pool, does zfs incures such overhead on drives to reduce its maximum speed by such a big number.
i have tried switching the pool to 8X 2disk mirror Vdevs but the read speed stays the same locked at maximum 1GB/s.
any help where the problem might be?
thanks
i have successfully built my new freenas server with the following specs
1- Dell R740 dual xeon 4114 CPU
2- 128GB RAM
3- inte x540-T2 dual 10GBe Card
4- LSI 9300-8e HBA Card
5- supermicro 847E1C-R1K28JBOD Storage enclosure
6- 16 X 12TB Seagate Exos HDD (in Enclosure)
7- 2 X Samsung 512GB pro SATA SSD(in Server)
8- 2 X Dell 600GB 15K SAS Drives (Boot Drives)
Pools Configuration:
1- 2 X 8 Disk Raidz2 Vdevs using the 12TB Drives
2- 1 X 2 SSD Disk Mirror Vdev (just for testing)
I have setup the system and its working but i have some problems with the read/ write speeds:
1- read speeda from the Raidz2 pool seems to be limited to 1GB/s whatever i try , i am testing using dd with the following command
Code:
dd if=tmp.dat of=/dev/null bs=2048k count=50k
the compression on the pool is off and no matter what i try the read speed is max 1GB/s , its seems there is a bottleneck somewhere in the system i cant identify .
Strangely enough the write speed maxes out at about 1800MB/s which is relatively within the expected performance of the pool.
2- the second problem is actually a question , the seagate exos are rated for 230MB/s sequential write speed and 170MB/s random but when i test the pool with dd which is i assume sequential and check the reporting section for the disk , every disk seems to max out at about 150MB/s which is why -i think - the max write speed is below the theoritical maximum of the pool, does zfs incures such overhead on drives to reduce its maximum speed by such a big number.
i have tried switching the pool to 8X 2disk mirror Vdevs but the read speed stays the same locked at maximum 1GB/s.
any help where the problem might be?
thanks