if those are not ssd drives, then adding a zil drive will most likely help.
On Sat, Apr 23, 2016 at 2:15 PM, Ralf <[email protected]> wrote: > Hi, > > I encounter very bad read/write performance on my mirror-zfs, even on > hypervisor-side. > > After shutting down all VMs, reading and writing from raw ZFS block > devices VMs runs at maximum 5MiB/s (tested with dd > if=/dev/rpool/VM/disk-100 of=/dev/null) while reading from the > underlying raw-disk (/dev/sda) has good performance (~100MiB/s). Of > course, performance inside VMs is even worse. Any ideas? > > This is my setup: > Proxmox / 4.1-30/9e199213 / Linux 4.4.6-1-pve / ZFS mirror, two disks > > ZFS setup: > > $ dmesg | grep ZFS > [ 2.882118] ZFS: Loaded module v0.6.5.6-1, ZFS pool version 5000, ZFS > filesystem version 5 > > $ zpool status > [snip] > NAME STATE READ WRITE CKSUM > rpool ONLINE 0 0 0 > mirror-0 ONLINE 0 0 0 > sdb2 ONLINE 0 0 0 > sda2 ONLINE 0 0 0 > > ZFS module parameters: > $ cat /etc/modprobe/zfs.conf > options zfs zfs_arc_max=3221225472 > > Partition alignement: > $ parted /dev/sda > (parted) align-check o 2 > 2 aligned > > Dedup: off > Checksumming: on > Compression: off > > Anything helps! > > Cheers > Ralf > _______________________________________________ > pve-user mailing list > [email protected] > http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user > _______________________________________________ pve-user mailing list [email protected] http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user
