[PVE-User] software RAID in 4.2

Miguel González miguel_3_gonzalez at yahoo.es
Mon Jan 23 18:34:11 CET 2017


root at myserver:~# cat /proc/mdstat
Personalities : [raid1]
md4 : active raid1 sda4[0] sdb4[1]
      1931980736 blocks [2/2] [UU]
      bitmap: 11/15 pages [44KB], 65536KB chunk

md2 : active raid1 sda2[0] sdb2[1]
      20478912 blocks [2/2] [UU]

Considering hdparm reports same speed for the underlying disk and the
soft raid seems some settings that need to be set. I´m asking here just
to be safe in terms of proxmox and not to be too aggressive. My
impression is that with ext3 I got better performance.

Miguel


On 01/23/17 5:33 PM, Daniel wrote:
> Hi,
> 
> i would say it more a softraid problem.
> 
> What you get when you do „cat /proc/mdstat“
> 
> Maybe still rebuilding.
> 
> 
>> Am 23.01.2017 um 16:35 schrieb Miguel González <miguel_3_gonzalez at yahoo.es>:
>>
>> Dear all,
>>
>>  I´m running Proxmox 4.2 onto a software RAID of 2 Tb SATA disks of
>> 7200 RPM.
>>
>>  I have set it up using OVH Proxmox installer with ext4. I have
>> realized that another server with just one SATA disk has writes of about
>> 140 MB/s while this server with 2 disks has just writes around 40 MB/s:
>>
>>  root at nyserver:~# hdparm -Tt /dev/sda
>>
>> /dev/sda:
>> Timing cached reads:   11800 MB in  2.00 seconds = 5903.84 MB/sec
>> Timing buffered disk reads: 136 MB in  3.17 seconds =  42.94 MB/sec
>>
>> root at myserver:~# hdparm -Tt /dev/md4
>>
>> /dev/md4:
>> Timing cached reads:   11356 MB in  2.00 seconds = 5682.49 MB/sec
>> Timing buffered disk reads: 132 MB in  3.10 seconds =  42.52 MB/sec
>>
>> I´m running 4.4.15-1-pve kernel.
>>
>> Is there any way to improve the performance of writes?
>>
>> Thanks!
>>
>> Miguel
>>
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> 
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