L2Arc通常configuration为在SSD上caching随机旋转盘读取。 我已经设置了这个configuration，希望加快目录遍历。
这是设置：
# zpool list -v NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT geek1 2.72T 1.18T 1.54T - 53% 43% 4.64x ONLINE - sdc 1.36T 606G 786G - 54% 43% sdd 1.36T 606G 786G - 53% 43% log - - - - - - zil 3.97G 0 3.97G - 0% 0% cache - - - - - - l2arc 32.0G 4.24G 27.8G - 0% 13% 该机器有20GB的内存：充足的弧。
我期望在文件系统上find一个find调用。 它加速了5倍，但从绝对的angular度来看，它还是很慢。 列出46M文件需要3.4小时。
# while true; do time find /geek1/ -type f|wc -l; done 46774149 real 1103m18.661s user 2m15.143s sys 5m52.096s 46774149 real 243m0.289s user 2m3.063s sys 5m7.107s 46774149 real 205m23.922s user 2m7.566s sys 6m32.638s
如何使目录遍历更有效率？
zpool get all打印：
NAME PROPERTY VALUE SOURCE geek1 size 2.72T - geek1 capacity 43% - geek1 altroot - default geek1 health ONLINE - geek1 guid default geek1 version - default geek1 bootfs - default geek1 delegation on default geek1 autoreplace off default geek1 cachefile - default geek1 failmode wait default geek1 listsnapshots off default geek1 autoexpand off default geek1 dedupditto 0 default geek1 dedupratio 4.64x - geek1 free 1.54T - geek1 allocated 1.18T - geek1 readonly off - geek1 ashift 0 default geek1 comment - default geek1 expandsize - - geek1 freeing 0 default geek1 fragmentation 53% - geek1 leaked 0 default geek1 feature@async_destroy enabled local geek1 feature@empty_bpobj active local geek1 feature@lz4_compress active local geek1 feature@spacemap_histogram active local geek1 feature@enabled_txg active local geek1 feature@hole_birth active local geek1 feature@extensible_dataset enabled local geek1 feature@embedded_data active local geek1 feature@bookmarks enabled local geek1 feature@filesystem_limits enabled local geek1 feature@large_blocks enabled local
如果您在Linux上使用ZFS，则缓慢度可能取决于xattr默认设置（ xattr=on ），该设置将隐藏目录/文件中的扩展属性存储。
尝试将chaning xattr设置为sa ，发出类似于zfs set xattr=sa <pool/fs> 。 但是，它只影响新创build的文件; 所以你需要删除/重新加载所有文件，以获得显着的加速。
换句话说，在重新加载所有文件之前，先进行一次小规模的尝试。