Karol, A few general pointers about EBS performance: We've seen throughput to an EBS volume vary considerably. Since EBS is iSCSI underneath, throughput to a volume can fluctuate, and it is also possible that your instance is on degraded hardware that gets very low throughput to the volume. So I would advise you to first gather some data about all your EBS volumes. You can measure throughput to them by doing something like: dd if=/dev/zero of=/path/to/ebs/mount bs=128k count=4096 oflag=direct The "oflag=direct" will give us the raw block device throughput, without the kernel cache in the way. The performance you see on the Gluster mountpoint will be a function of the EBS performance. You might also want to spin up a couple more instances and see their EBS throughput to get an idea of the range of EBS performance. Doing a RAID0 of 4 or 8 EBS volumes using mdadm will also help you increase performance. ------------------------------ Vikas Gorur Engineer - Gluster, Inc. ------------------------------
