[PVE-User] software RAID in 4.2

[Miguel González]

As asked by the hosting company I shut down and test in rescue mode. I
also tested with proxmox running but with all VMs shut down (my tests
were done with all VMs running).

There is an increase in speed reads but I find that FSYNCs are still low
and reads differ too much (from 100 MB/s to 140 MB/s):

root at myserver:~# pveperf /vz/
CPU BOGOMIPS: 42667.60
REGEX/SECOND: 1099581
HD SIZE: 1809.50 GB (/dev/mapper/pve-data)
BUFFERED READS: 138.73 MB/sec
AVERAGE SEEK TIME: 18.94 ms
FSYNCS/SECOND: 1.97
DNS EXT: 17.82 ms
DNS INT: 13.27 ms (myserver)
root at myserver:~# pveperf /vz/
CPU BOGOMIPS: 42667.60
REGEX/SECOND: 1162253
HD SIZE: 1809.50 GB (/dev/mapper/pve-data)
BUFFERED READS: 123.24 MB/sec
AVERAGE SEEK TIME: 13.28 ms
FSYNCS/SECOND: 39.64
DNS EXT: 11.67 ms
DNS INT: 19.81 ms (myserver)
root at myserver:~# pveperf /vz/
CPU BOGOMIPS: 42667.60
REGEX/SECOND: 1123387
HD SIZE: 1809.50 GB (/dev/mapper/pve-data)
BUFFERED READS: 121.61 MB/sec
AVERAGE SEEK TIME: 13.83 ms
FSYNCS/SECOND: 22.67
DNS EXT: 14.01 ms
DNS INT: 13.90 ms (myserver)
root at myserver:~# pveperf /vz/
CPU BOGOMIPS: 42667.60
REGEX/SECOND: 1138502
HD SIZE: 1809.50 GB (/dev/mapper/pve-data)
BUFFERED READS: 100.28 MB/sec
AVERAGE SEEK TIME: 13.74 ms
FSYNCS/SECOND: 41.03
DNS EXT: 13.72 ms
DNS INT: 12.70 ms (myserver)
root at myserver:~# pveperf /vz/
CPU BOGOMIPS: 42667.60
REGEX/SECOND: 1102421
HD SIZE: 1809.50 GB (/dev/mapper/pve-data)
BUFFERED READS: 134.41 MB/sec
AVERAGE SEEK TIME: 12.74 ms
FSYNCS/SECOND: 30.34
DNS EXT: 11.25 ms
DNS INT: 14.16 ms (myserver)
root at myserver:~# hdparm -tT /dev/sda

/dev/sda:
Timing cached reads: 16160 MB in 2.00 seconds = 8087.23 MB/sec
Timing buffered disk reads: 434 MB in 3.00 seconds = 144.60 MB/sec
root at myserver:~# hdparm -tT /dev/sdb

/dev/sdb:
Timing cached reads: 16492 MB in 2.00 seconds = 8253.77 MB/sec
Timing buffered disk reads: 456 MB in 3.01 seconds = 151.44 MB/sec

Are these numbers normal for a SATA 7.200 RPM Software RAID with ext4?

What numbers can I expect with SSD?

Thanks!

Miguel