System information

V1.4.2 4/9 Apr/07/2015
OS5 X64 FW 2.05.08
StarPort initiator 3.5.2
MAC OS: globalSAN iSCSI initiator version 4.1 (279)
Linux: open-iscsi 2.0-865
e. There is a system advanced option to choose 4K or 512 bytes block size for
iSCSI volume, and the default is 4K bytes. 512 bytes block size may encounter
2TB volume capacity limitation on some initiators running 32bit OS.
Nevertheless, 4K block size could slice the iSCSI volume over 2TB, but, there
might be compatibility issue. For VMware, we recommend using 512 bytes
block size.
8. iSCSI Expansion : there are some limitations applied.
a. The maximum iSCSI volume would be 16TB (EXT3/EXT4), and the minimum
expansion size is 1GB.
b. There is no iSCSI volume size limitation with XFS RAID volume.
c. iSCSI service will be stopped till the expansion completes.
d. iSCSI expansion just handles the volume size. The partition(s) inside the volume
won’t be adjusted.
e. iSCSI expansion just support local RAID, does not support add-on RAID by
iSCSI stackable.
9. Stackable function : Support of stackable function across Thecus N8900/N12000/N16000
NASes.
a. The concurrent connection on target iSCSI volume of Thecus NAS will be limited
to 1 if the initiator comes from other Thecus NASes.
b. The internal file system format of stackable target is EXT4, and the maximum
capacity is 16 TB.
10. iSCSI Thin-Provisioning
a. The Thin-Provision capacity has to be determined first.
b. Up to five iSCSI Thin-Provision target can be created on the Thin-Provision
capacity.
c. The total virtual size of iSCSI Thin-Provision targets in a RAID:
Thin-Provisioning
File System
Capacity Limit
EXT3
16 TB
EXT4
16 TB
XFS
64 TB
d. The virtual size should be larger than the real capacity and less than 16 TB.
e. When determine the virtual size, the minimum increase is 100GB.
f. When the total used capacity reaches 90% of real Thin-Provision capacity, NAS
will send E-mail notifications out every 10 minutes until the capacity expanded.
Also, system log will show capacity warning in admin web interface. The host
server won’t receive any notification before the iSCSI Thin-Provision target full.