[Gluster-users] Gluster very poor performance when copying small files (1x (2+1) = 3, SSD)

[Rik Theys]

Hi,

On 03/19/2018 03:42 PM, TomK wrote:
> On 3/19/2018 5:42 AM, Ondrej Valousek wrote:
> Removing NFS or NFS Ganesha from the equation, not very impressed on my
> own setup either.  For the writes it's doing, that's alot of CPU usage
> in top. Seems bottle-necked via a single execution core somewhere trying
> to facilitate read / writes to the other bricks.
> 
> Writes to the gluster FS from within one of the gluster participating
> bricks:
> 
> [root at nfs01 n]# dd if=/dev/zero of=./some-file.bin
> 
> 393505+0 records in
> 393505+0 records out
> 201474560 bytes (201 MB) copied, 50.034 s, 4.0 MB/s

That's not really a fare comparison as you don't specify a blocksize.
What does

dd if=/dev/zero of=./some-file.bin bs=1M count=1000 oflag=direct

give?


Rik

-- 
Rik Theys
System Engineer
KU Leuven - Dept. Elektrotechniek (ESAT)
Kasteelpark Arenberg 10 bus 2440  - B-3001 Leuven-Heverlee
+32(0)16/32.11.07
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