I'm using openSUSE 13.1.

I created a new directory on a zpool

zfs create zpgd0/iSCSI -o compression=lz4 -o atime=off

but I'm not looking on that... So I do it again but I'm getting...

zfs create zpgd0/iSCSI -o compression=lz4 -o atime=off
cannot create 'zpgd0/iSCSI': dataset already exists

adding some data

zpool history 
History for 'zpgd0':
2014-08-11.13:38:21 zpool create -f zpgd0 raidz2 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0490461 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0603473 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0606817 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0670246 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0673599 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0715212 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0722699 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0731193 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0732862 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0806663 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0807385 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0816943
2014-08-11.14:13:09 zpool set autoexpand=on zpgd0
2014-08-11.14:14:32 zfs create zpgd0/espacio
2014-08-19.11:47:47 zfs create zpgd0/iSCSI -o compression=lz4 -o atime=off

 zpool status -v
  pool: zpgd0
 state: ONLINE
  scan: none requested
config:

    NAME                                            STATE     READ WRITE CKSUM
    zpgd0                                           ONLINE       0     0     0
      raidz2-0                                      ONLINE       0     0     0
        scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0490461  ONLINE       0     0     0
        scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0603473  ONLINE       0     0     0
        scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0606817  ONLINE       0     0     0
        scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0670246  ONLINE       0     0     0
        scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0673599  ONLINE       0     0     0
        scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0715212  ONLINE       0     0     0
        scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0722699  ONLINE       0     0     0
        scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0731193  ONLINE       0     0     0
        scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0732862  ONLINE       0     0     0
        scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0806663  ONLINE       0     0     0
        scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0807385  ONLINE       0     0     0
        scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0816943  ONLINE       0     0     0

errors: No known data errors

I have no errors but the folder does not appear, so what Can I do?

sorry add it

zfs list
NAME          USED  AVAIL  REFER  MOUNTPOINT
zpgd0         933K  35,5T  54,7K  /zpgd0
zpgd0/iSCSI  54,7K  35,5T  54,7K  /zpgd0/iSCSI