I''ve been writing via tar to a pool some stuff from backup, around 500GB. Its taken quite a while as the tar is being read from NFS. My ZFS partition in this case is a RAIDZ 3-disk job using 3 400GB SATA drives (sil3124 card) Ever once in a while, a "df" stalls and during that time my io''s go flat, as in : capacity operations bandwidth pool used avail read write read write ---------- ----- ----- ----- ----- ----- ----- pool 571G 545G 0 34 1017 2.25M pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 0 0 0 0 pool 571G 545G 48 176 82.8K 5.31M pool 571G 545G 48 313 283K 26.0M pool 571G 545G 299 130 1.05M 4.05M pool 571G 545G 163 160 932K 4.70M pool 571G 545G 320 0 1.02M 0 Is this an ARC issue or some sort of flush happening. This is B40.