Why is HP Smart Array P420/1GB so slow?

Question

System administration

4 ssd samsung 850pro 1gb are connected to the HP Smart Array P420/1GB controller. Disks are collected in raid-10. This shelf is used as local-lvm storage for proxmox 4.2. Windows server 2012r2 is installed in the virtual machine. I measure the speed and get

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CrystalDiskMark 5.2.1 x64 (C) 2007-2017 hiyohiyo
                           Crystal Dew World : http://crystalmark.info/
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* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
* KB = 1000 bytes, KiB = 1024 bytes

   Sequential Read (Q= 32,T= 1) :   995.651 MB/s
  Sequential Write (Q= 32,T= 1) :   153.450 MB/s
  Random Read 4KiB (Q= 32,T= 1) :    41.382 MB/s [ 10103.0 IOPS]
 Random Write 4KiB (Q= 32,T= 1) :    10.231 MB/s [  2497.8 IOPS]
         Sequential Read (T= 1) :   833.864 MB/s
        Sequential Write (T= 1) :    55.364 MB/s
   Random Read 4KiB (Q= 1,T= 1) :    16.172 MB/s [  3948.2 IOPS]
  Random Write 4KiB (Q= 1,T= 1) :     1.088 MB/s [   265.6 IOPS]

  Test : 1024 MiB [C: 73.1% (23.1/31.7 GiB)] (x5)  [Interval=5 sec]
  Date : 2017/04/11 21:33:44
    OS : Windows Server 2012 R2 Server Standard (full installation) [6.3 Build 9600] (x64)

The drive is connected with the No cache option.
Why such low performance?
PS Please tell me how to measure disk performance on debian in similar parrots.

Answer 1

TRIM does not work for you in this configuration.
Here you need either server disks, or over provisioning in sufficient sizes.
According to the test data, it is clearly visible that your disk is packed to capacity, and there are no free cells for recording.
Hence the strong drawdowns on the record.

Answer 2

could you please tell me how to measure disk performance in similar parrots on debian.

man dd
measure not 1Gb but 10, run several tests at the same time, the result will get worse?
It is possible that the host system is reserving I/O resources.
PS: Did I understand correctly that this is all within the same physical machine?

Answer 3

If you enable the option Physical drive write cache state -> Enabled in the raid controller settings, then the write speed will increase significantly.
Here there is an instruction and speed measurements with the option turned on and off.
https://servak.com.ua/blog/rukovodstva/kak-dobitsj...