Re: software raid settings and ext4

[Miguel González <miguel_3_gonzalez@yahoo.es>]

On 01/24/17 8:56 PM, Pascal Hambourg wrote:
> Le 24/01/2017 à 00:45, Miguel González a écrit :
>>
>>  I´m running Proxmox 4.2 which is debian jessy with a software RAID of 2
>> Tb SATA disks of 7200 RPM in a dedicated server.
>>
>>   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 reads around 40 MB/s:
>>
>>   root@myserver:~# 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
> 
> Is this a physical disk ? Then it is slow by today's standards, or
> defective, or busy doing other reads while you run the test.
> 
> There is nothing RAID or ext4 can do to make it faster.
> 
> 

Yes, it´s a physical disk. I have raised a ticket with the hosting company.

Thanks!