Hi Yannis, On 04/26/2016 12:30 AM, Yannis Milios wrote: > Hi Ralf, > > Are both hard drives exactly the same model? Yes, they are. > > I've noticed that your drive uses 512byte sector size (instead of 4K > sector size which is the current trend). Yes, 512/512. > > In that case, is your pool properly aligned to ashift=9 ? zpool get ashift states, that ashift=12. In that case, should it be changed to 9 or is it even possible to change this parameter?
Ralf > > More info here: > http://wiki.illumos.org/display/illumos/ZFS+and+Advanced+Format+disks > > Regards, > > Yannis > > On 04/25/2016 09:38 PM, Ralf wrote: >> On 04/25/2016 10:14 PM, Lindsay Mathieson wrote: >>> On 25/04/2016 11:43 PM, Ralf wrote: >>>> some more random analysis: >>>> I used atop to debug the problem. >>>> >>>> Turned out, that disks are 100% busy and the average io time is beyond >>>> all hope. ZFS seems to read/write/arrange things in a random and >>>> not in >>>> a sequential way. >>> >>> What does "iotop -P --only" show? >> That dd is using 100% of io. Ram usage is 5/10 GiB at the moment, so >> more than enough free ram. >>> I suspect lack of ram is your problem. >> Why do I need so much RAM for mirror raid? All ram-intensive features >> are turned off. >> >> 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 _______________________________________________ pve-user mailing list [email protected] http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user
