kevin00xxl
Cadet
- Joined
- Sep 15, 2017
- Messages
- 4
Hi,
i have a HP ML10v2 with the following specs:
i then tested the performance with the following command:
Read
dd of=/dev/null if=/mnt/mirror/dataset/test.dat bs=2048k count=10000
Write
dd if=/dev/zero of=/mnt/mirror/dataset/test.dat bs=2048k count=10000
i then archived read speeds of 107MB/s and write speeds of 105MB/s.
however, i expected that when drives are set up in a mirror that the write speed would be the same as a single drive but the read speeds would be as fast as (in my case) 2 drives.
because of the use of parallel reads from both drives.
am i doing something wrong here or is this the way FreeNAS handles a small 2 disk mirror?
i also tested a striped setup and got about 200MB/s both read and write, so the problem does not seem to be my hardware.
i appreciate every bit of help i could get, i have been trying to solve this problem for some time allready and can't figure it out
Thanks in advance
i have a HP ML10v2 with the following specs:
- Intel Xeon E3 1230v3
- 16GB Kingston ECC
- Onboard sata controller in AHCI
- 2x2TB WD RE4
- 8GB Kingston USB2.0 (FreeNAS)
i then tested the performance with the following command:
Read
dd of=/dev/null if=/mnt/mirror/dataset/test.dat bs=2048k count=10000
Write
dd if=/dev/zero of=/mnt/mirror/dataset/test.dat bs=2048k count=10000
i then archived read speeds of 107MB/s and write speeds of 105MB/s.
however, i expected that when drives are set up in a mirror that the write speed would be the same as a single drive but the read speeds would be as fast as (in my case) 2 drives.
because of the use of parallel reads from both drives.
am i doing something wrong here or is this the way FreeNAS handles a small 2 disk mirror?
i also tested a striped setup and got about 200MB/s both read and write, so the problem does not seem to be my hardware.
i appreciate every bit of help i could get, i have been trying to solve this problem for some time allready and can't figure it out
Thanks in advance