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I/O speed
Hello, just testing my servers i would like to know, wich is the principal factor, brand? RPM? capacity? raid?
1.- RAID10 4x3TB:
CPU model : Intel(R) Xeon(R) CPU L5520 @ 2.27GHz
Number of cores : 8
CPU frequency : 1600.000 MHz
Total amount of ram : 32099 MB
Total amount of swap : 4095 MB
System uptime : 14 days, 9:37,
I/O speed : io= 29.6 MB/s
# ./ioping -c10 .
4.0 kb from . (ext4 /dev/sda3): request=1 time=20.2 ms
4.0 kb from . (ext4 /dev/sda3): request=2 time=515 us
4.0 kb from . (ext4 /dev/sda3): request=3 time=6.4 ms
4.0 kb from . (ext4 /dev/sda3): request=4 time=418 us
4.0 kb from . (ext4 /dev/sda3): request=5 time=447 us
4.0 kb from . (ext4 /dev/sda3): request=6 time=25.4 ms
4.0 kb from . (ext4 /dev/sda3): request=7 time=11.6 ms
4.0 kb from . (ext4 /dev/sda3): request=8 time=570 us
4.0 kb from . (ext4 /dev/sda3): request=9 time=20.3 ms
4.0 kb from . (ext4 /dev/sda3): request=10 time=12.5 ms
--- . (ext4 /dev/sda3) ioping statistics ---
10 requests completed in 9.1 s, 101 iops, 407.0 kb/s
min/avg/max/mdev = 418 us / 9.8 ms / 25.4 ms / 9.1 ms
2.- RAID10 4x1TB (just purchased) RAID: LSI 9271-4i w BBU
CPU model : Intel(R) Xeon(R) CPU E3-1270 v3 @ 3.50GHz
Number of cores : 8
CPU frequency : 800.000 MHz
Total amount of ram : 32068 MB
Total amount of swap : 16095 MB
System uptime : 4:17,
I/O speed : io= 358 MB/s
# ./ioping -c10 .
4.0 kb from . (ext3 /dev/mapper/vg-root): request=1 time=166 us
4.0 kb from . (ext3 /dev/mapper/vg-root): request=2 time=212 us
4.0 kb from . (ext3 /dev/mapper/vg-root): request=3 time=156 us
4.0 kb from . (ext3 /dev/mapper/vg-root): request=4 time=156 us
4.0 kb from . (ext3 /dev/mapper/vg-root): request=5 time=160 us
4.0 kb from . (ext3 /dev/mapper/vg-root): request=6 time=158 us
4.0 kb from . (ext3 /dev/mapper/vg-root): request=7 time=144 us
4.0 kb from . (ext3 /dev/mapper/vg-root): request=8 time=122 us
4.0 kb from . (ext3 /dev/mapper/vg-root): request=9 time=163 us
4.0 kb from . (ext3 /dev/mapper/vg-root): request=10 time=150 us
--- . (ext3 /dev/mapper/vg-root) ioping statistics ---
10 requests completed in 9.0 s, 6.3 k iops, 24.6 mb/s
min/avg/max/mdev = 122 us / 158 us / 212 us / 21 us
3.- SSD 256GB:
CPU model : Intel(R) Xeon(R) CPU E3-1270 v3 @ 3.50GHz
Number of cores : 8
CPU frequency : 800.000 MHz
Total amount of ram : 32045 MB
Total amount of swap : 16095 MB
System uptime : 31 days, 8:54,
I/O speed : io= 244 MB/s
all are dedicated servers.
Comments
This is likely WD RED.
It depends on RAID card if you have 1 or SATA chipset on motherboard and the drives.
Very slow, not using enterprise drives and SATA 1.
principal factor: usage.
If by principal factor you mean in determining I/O speed, RPM and RAID level.
WD green Maybe... But then also it's Quite slow like few times! 1st Config.
is the ssd there too slow or the 4x1tb too fast?
The HDD is too fast, or rather just shows the cache. Likely a raid card with write cache and will go back to normal with some usage.
4x1gb is not too fast. I had one with regular disks (sata 3, 7200) and was about the same (server idle otherwise, no writeback as it lacked battery).
The 4x3gb is too slow. Each of those drives is 3-4 times as fast it should do 200 in a rainy day unless it is overloaded already.
Might be some wrong raid setup.
thanks to all, im going to move all from server 1, to server 2
faster = better
I/O and CPU
Have you tried running ioping as well?
updated with ioping