[PVE-User] software RAID in 4.2

Miguel González miguel_3_gonzalez at yahoo.es
Tue Jan 24 10:11:11 CET 2017


Reads and in both, Proxmox and therefore in guest VMs.

As you can see in my messages writes seem to be more or less fine around
140 MB/s in Proxmox while reads are around 40 MB/s.

At this point I don´t know if there is something related to hardware or
software, I have raised a ticket with support.

Thanks!

Miguel






On 01/24/17 9:04 AM, Eneko Lacunza wrote:
> Miguel,
> 
> You have trouble with writes or reads?
> 
> From Proxmox or from a guest VM?
> 
> El 23/01/17 a las 19:39, Miguel González escribió:
>> Sorry I meant reads, pveperf:
>>
>> root at myserver:~# pveperf /vz/
>> CPU BOGOMIPS:      42669.12
>> REGEX/SECOND:      935261
>> HD SIZE:           1809.50 GB (/dev/mapper/pve-data)
>> BUFFERED READS:    94.56 MB/sec
>> AVERAGE SEEK TIME: 17.88 ms
>> FSYNCS/SECOND:     10.15
>> DNS EXT:           16.93 ms
>> DNS INT:           23.36 ms (ibertrix-node2)
>>
>>
>> from specs from the manufacturer average seek time is around 8 ms
>>
>> writes are like this:
>>
>> root at myserver:~# dd if=/dev/zero of=/mytempfile
>> ^C15210305+0 records in
>> 15210305+0 records out
>> 7787676160 bytes (7.8 GB) copied, 52.1116 s, 149 MB/s
>>
>>
>> performance from a VM (I have 5 VMs running in this 32 Gb RAM server)
>> running Centos 6.8:
>>
>> root at vm [~]# dd if=/dev/zero of=/mytempfile
>> ^C9360176+0 records in
>> 9360176+0 records out
>> 4792410112 bytes (4.8 GB) copied, 112.571 s, 42.6 MB/s
>>
>> The settings for virtual HD are: qcow2 and writeback cache
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> On 01/23/17 7:02 PM, Mehmet wrote:
>>> For datasafety i would not disable Barrier!
>>>   But do you mean realy write Performance? As i know hdparm is used
>>> for read Performance...
>>>
>>> Am 23. Januar 2017 18:57:19 MEZ schrieb Michael Rasmussen
>>> <mir at miras.org>:
>>>> On Mon, 23 Jan 2017 18:34:11 +0100
>>>> Miguel González <miguel_3_gonzalez at yahoo.es> wrote:
>>>>
>>>>> 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.
>>>>>
>>>> You can achieve the same performance and security level with ext4 as
>>>> you did with ext3 by using this mount option: barrier=0
>>>>
>>>> -- 
>>>> Hilsen/Regards
>>>> Michael Rasmussen
>>>>
>>>> Get my public GnuPG keys:
>>>> michael <at> rasmussen <dot> cc
>>>> http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xD3C9A00E
>>>> mir <at> datanom <dot> net
>>>> http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xE501F51C
>>>> mir <at> miras <dot> org
>>>> http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xE3E80917
>>>> --------------------------------------------------------------
>>>> /usr/games/fortune -es says:
>>>> You are here:
>>>>         ***
>>>>         ***
>>>>          *********
>>>>           *******
>>>>            *****
>>>>         ***
>>>>          *
>>>>
>>>>          But you're not all there.
>>> _______________________________________________
>>> pve-user mailing list
>>> pve-user at pve.proxmox.com
>>> http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user
>>>
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> 
> 



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