[PVE-User] software RAID in 4.2

Miguel González miguel_3_gonzalez at yahoo.es
Mon Jan 23 19:39:12 CET 2017


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.
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