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Hi, When deploying ZFS in cluster environment it would be nice to be able to have some SSDs as local drives (not on SAN) and when pool switches over to the other node zfs would pick up the node''s local disk drives as L2ARC. To better clarify what I mean lets assume there is a 2-node cluster with 1sx 2540 disk array. Now lets put 4x SSDs in each node (as internal/local drives). Now

...k2*(x2+u2)) win3=1/n3* (sum(mat3[e3:f3])+k3*(x3+u3)) win4=1/n4* (sum(mat4[e4:f4])+k4*(x4+u4)) ## g-winsorized sum of squared deviations ssd1=sum((mat1[e1:f1]-win1)^2) + k1*((mat1[k1+1]-win1)^2 + (mat1[n1-k1]-win1)^2) ssd2=sum((mat2[e2:f2]-win2)^2) + k2*((mat2[k2+1]-win2)^2 + (mat2[n2-k2]-win2)^2) ssd3=sum((mat3[e3:f3]-win3)^2) + k3*((mat3[k3+1]-win3)^2 + (mat3[n3-k3]-win3)^2) ssd4=sum((mat4[e4:f4]-win4)^2) + k4*((mat4[k4+1]-win4)^2 + (mat4[n4-k4]-win4)^2) ## calculate f statistic J=4 h1=n1-2*floor(alpha*n1) h2=n2-2*floor(alpha*n2) h3=n3-2*floor(alpha*n3) h4=n4-2*floor(alpha*n4) H=h1+h2+h3+h4...

...x4+u4)) > > ## g-winsorized sum of squared deviations > > ssd1=sum((mat1[e1:f1]-win1)^2) + k1*((mat1[k1+1]-win1)^2 + > (mat1[n1-k1]-win1)^2) > ssd2=sum((mat2[e2:f2]-win2)^2) + k2*((mat2[k2+1]-win2)^2 + > (mat2[n2-k2]-win2)^2) > ssd3=sum((mat3[e3:f3]-win3)^2) + k3*((mat3[k3+1]-win3)^2 + > (mat3[n3-k3]-win3)^2) > ssd4=sum((mat4[e4:f4]-win4)^2) + k4*((mat4[k4+1]-win4)^2 + > (mat4[n4-k4]-win4)^2) > > ## calculate f statistic > > J=4 > h1=n1-2*floor(alpha*n1) &...

...data security is not an issue in this scenario). When using btrfs on the same hardware (same SSD, same system), it took us ~ 120min. The filesystem was mounted using the following options: > mount -t btrfs -o nodatasum,nodatacow,nobarrier,ssd,noacl,notreelog,noatime,nodiratime /dev/sdg /data-ssd3 (Both measurements done under linux-2.6.34). Looks like btrfs is not really tuned to perform well in the above scenario. I would appreciate any advise on how to improve btrfs'' performance for the above scenario. Regards, Peter Niemayer -- To unsubscribe from this list: send the line...

My google-fu is coming up short on this one... I didn''t see that it had been discussed in a while ... What is the status of ZFS support for TRIM? For the pool in general... and... Specifically for the slog and/or cache??? -------------- next part -------------- An HTML attachment was scrubbed... URL: