Hello,
i have a 3 Node Gluster with one distributed Volume. All 3 Nodes are identically in their Hardware. All have 6x3TB Seagate ST3000DM001. The disk on each Node are in a Softwareraid6 (Blocksize 4096| Stripe 512) with ext4 filesystem on Debian Wheezy. As the Raid was new i testet it with fio:
[sequential-write]
rw=write
size=5g
direct=0
numjobs=3
group_reporting
name=sequential-write-buffered
bs=4k
runtime=10
rw=write
size=5g
direct=0
numjobs=3
group_reporting
name=sequential-write-buffered
bs=4k
runtime=10
Result: WRITE: io=3014.2MB, aggrb=308456KB/s, minb=308456KB/s, maxb=308456KB/s,
I added a new sata controller Digitus DS-30104-1 4 Port PCIe x4, each Port 6GBits on x16 Slot. Node1 has now 7 Disks in Raid6. I added another Disk 3TB same model too on the Controller and copied files 20-40GB onto the volume. The Volume is mounted on the same node with "mount -t gluster-fs IP-Adress:/vol1" The Problem is that the writespeed is only 20MB/s. This is what i didnt understand. The files are copied on the same machine, not over the network, perhaps the bus-system of the mainboard is to slow? Any kind of performance tuning?
thx
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