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60
SAS 712 U Series User Manual
1.
Click the
Create
by clicking mouse right button.
2.
Enter a
Name
for the file system or volume.
3.
Use the drop-down list to select a
Pool
.
4.
Select
Type
,
Property
,
Compression type
,
Sync
, and
No. of data copies
.
5.
Enter the
Size
for the file system or volume.
6.
Click
OK
button.
TIP:
“Type” has two options – “File system” and “Volume”.
File system: File level access and folder sharing. To use with data services
such as CIFS, NFS, AFP, FTP, and WebDAV.
Volume: Block level access. To use with iSCSI target function.
TIP:
“Compression” options:
Disabled: no compression at all. Default value.
Zero Reclaim: when the data block contains all zeros, no physical space
will be consumed. The block will be marked specifically.
Generic Zero Reclaim: This is JetStor patent filing technology that will
reclaim data blocks with special patterns such as all 0’s, all 1’s.
Theoretically, it will have better storage efficiency.
Enabled: This will always enable lossless data compression function using
LZJB algorithm.
TIP:
“Sync” means synchronous I/O, which is similar to the definition of write-
through. Synchronous I/O is that every file system transaction is written and
flushed to stable storage devices by a system call return. The application needs
to wait for the physical data update completion before it could issue another
command. Latency will be longer and performance will suffer.
If you don’t know how to use this setting, please leave it as default.
