> I think for the cleanness of the experiment, you should also include "sync" after the dd's, to actually commit your file to the pool.
OK that 'fixes' it: finsdb137@root> dd if=/dev/random of=ob bs=128k count=1 && sync && while true > do > ls -s ob > sleep 1 > done 0+1 records in 0+1 records out 4 ob 4 ob 4 ob .. etc. I guess I knew this had something to do with stuff being flushed to disk, I don't know why I didn't think of it myself. > What is the pool's redundancy setting? copies=1. Full zfs get below, but in short, it's a basic mirrored root with default settings. Hmm, maybe I should mirror root with copies=2..... ;) > I am not sure what "ls -s" actually accounts for file's FS-block usage, but I wonder if it might include metadata (relevant pieces of the block pointer tree individual to the file). Also check if the disk usage reported by "du -k ob" varies similarly, for the fun of it? Yes, it varies too. finsdb137@root> dd if=/dev/random of=ob bs=128k count=1 && while true > do > ls -s ob > du -k ob > sleep 1 > done 0+1 records in 0+1 records out 1 ob 0 ob 1 ob 0 ob 1 ob 0 ob 1 ob 0 ob 4 ob 2 ob 4 ob 2 ob 4 ob 2 ob 4 ob 2 ob 4 ob 2 ob finsdb137@root> zfs get all rpool/ROOT/s10s_u9wos_14a NAME PROPERTY VALUE SOURCE rpool/ROOT/s10s_u9wos_14a type filesystem - rpool/ROOT/s10s_u9wos_14a creation Tue Mar 1 15:09 2011 - rpool/ROOT/s10s_u9wos_14a used 20.6G - rpool/ROOT/s10s_u9wos_14a available 37.0G - rpool/ROOT/s10s_u9wos_14a referenced 20.6G - rpool/ROOT/s10s_u9wos_14a compressratio 1.00x - rpool/ROOT/s10s_u9wos_14a mounted yes - rpool/ROOT/s10s_u9wos_14a quota none default rpool/ROOT/s10s_u9wos_14a reservation none default rpool/ROOT/s10s_u9wos_14a recordsize 128K default rpool/ROOT/s10s_u9wos_14a mountpoint / local rpool/ROOT/s10s_u9wos_14a sharenfs off default rpool/ROOT/s10s_u9wos_14a checksum on default rpool/ROOT/s10s_u9wos_14a compression off default rpool/ROOT/s10s_u9wos_14a atime on default rpool/ROOT/s10s_u9wos_14a devices on default rpool/ROOT/s10s_u9wos_14a exec on default rpool/ROOT/s10s_u9wos_14a setuid on default rpool/ROOT/s10s_u9wos_14a readonly off default rpool/ROOT/s10s_u9wos_14a zoned off default rpool/ROOT/s10s_u9wos_14a snapdir hidden default rpool/ROOT/s10s_u9wos_14a aclmode groupmask default rpool/ROOT/s10s_u9wos_14a aclinherit restricted default rpool/ROOT/s10s_u9wos_14a canmount noauto local rpool/ROOT/s10s_u9wos_14a shareiscsi off default rpool/ROOT/s10s_u9wos_14a xattr on default rpool/ROOT/s10s_u9wos_14a copies 1 default rpool/ROOT/s10s_u9wos_14a version 3 - rpool/ROOT/s10s_u9wos_14a utf8only off - rpool/ROOT/s10s_u9wos_14a normalization none - rpool/ROOT/s10s_u9wos_14a casesensitivity sensitive - rpool/ROOT/s10s_u9wos_14a vscan off default rpool/ROOT/s10s_u9wos_14a nbmand off default rpool/ROOT/s10s_u9wos_14a sharesmb off default rpool/ROOT/s10s_u9wos_14a refquota none default rpool/ROOT/s10s_u9wos_14a refreservation none default rpool/ROOT/s10s_u9wos_14a primarycache all default rpool/ROOT/s10s_u9wos_14a secondarycache all default rpool/ROOT/s10s_u9wos_14a usedbysnapshots 0 - rpool/ROOT/s10s_u9wos_14a usedbydataset 20.6G - rpool/ROOT/s10s_u9wos_14a usedbychildren 0 - rpool/ROOT/s10s_u9wos_14a usedbyrefreservation 0 - rpool/ROOT/s10s_u9wos_14a logbias latency default _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
