Recent content by javildn

Yes, with 8k.

I have tested in both directions, I didn't run "zpool upgrade" on the 0.7.1 updated host, maybe that is why it works.

Strange...I have been able to send and receive datasets between hosts with 0.6.5 and 0.7.1 without errors

Finally, the only way to get good performance (similar to LVM) was to upgrade ZFS 0.7.1 following these instructions: https://forum.proxmox.com/threads/upgrade-zfs-0-7-0.35943/page-2#post-180792 I know this is an unsupported method, so I hope zfs 0.7.1 will be fully supported soon.

I have tested your script in a test box and it worked like a charm. The performance with zfs 0.7.1 has been increased a lot. Hope it will be added to pve-test repository soon.

Random write is a lot faster with 4k blocksize but random read is slower than before with 8k... :(

So, all my tests concluded is much more better use 4k volblocksize, is it safe or I could have another problems?

Thank you! Good to know

I haved created a new zvol with volblocksize=4k, asigned to the VM, cloned CentOS with dd to the new disk, and rebooted the VM with the new disk. The performance increased dramatically! Now I get expected IOPS. Maybe it would be a good idea to be able to change volblocksize when creating a new...

Hi! I understand your point, however I maded a new test: I created a new VM, I installed then Centos 7 without LVM and ext4. If I do the fio test inside the VM the results are same ~5000 IOPS. However if I stop the VM and mount the zvol directly in the host (mount /dev/mapper/vm-102-disk-1p2...

Running fio test on a zvol directly on the host gets higher values! About 2x/3x faster! Not as fast as LVM but I think it will be enough. Why the VM cannot get these IOPS? I noticed while running FIO test directly on the host, iowait raises up to 50% but when running FIO on the VM, iowait on...

I have tried it right now, FIO results inside VM are very similar with sync disabled. 4900-5000 IOPS # zfs get all | grep sync rpool sync disabled local rpool/ROOT sync disabled inherited from...

Nobody can help? Is this normal in ZFS?

Similar result, 4590 IOPS :( [root@localhost ~]# mount | grep root /dev/mapper/cl-root on / type ext4 (rw,relatime,data=ordered) Fio: randfile: (groupid=0, jobs=8): err= 0: pid=10228: Mon Sep 4 09:54:14 2017 write: io=8192.0MB, bw=18364KB/s, iops=4590, runt=456801msec slat (usec)...

Both setups are similar, only difference is one server is ZFS backed and the other one is LVM. 1] According to Rhinox, zfs raid1 would have same write performance as single drive. 2] I know it, this is what I am testing, I expected to have some write penalty in ZFS, but my benchmarks shows 4x...