[PVE-User] software RAID in 4.2

Eneko Lacunza elacunza at binovo.es
Tue Jan 24 09:04:49 CET 2017


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
>
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> 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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