Hi @all,
it's my first mailt o this list so let me introduce myself.
My name is Marcus Schwarz and I'm working for NWE a company which
provides IT services and solutions for medium sized companys .
At the moment I try to find the problem with a iscsi setup I use.
The initiator setup :
Asus P5Q Board
Intel C2Quad 9550
4GB RAM
Intel Pro 1000MT Gigabit NIC
Windows 7 X64
HP Gigabit Switch
The target setup :
Fedora 15 X86_64
Kernel 2.6.40-4 (aka Kernel 3.0)
scsi-target-utils 1.0.18-1
raid-5 setup with 4*2TB WD20EARS-Caviar green
I can see all iscsi targets in Windows and connect to each of it without
any problem. When I do a file transfer to one of those targets I get a
write performance of about 10-12 MB/s .
I'm using NO Jumbo-Frames
That's how my targets.conf file looks like :
### begin of targets.conf file ###
default-driver iscsi
<target iqn.2011-08.com.somedomain.internal:storage.steam>
backing-store /storage/iscsi/iscsi-steam
lun 1
</target>
InitialR2T Yes
ImmediateData Yes
### end of targets.conf file ###
That's how this target look like :
### begin of target ###
Target 5: iqn.2011-08.com.somedomain.internal:storage.steam
System information:
Driver: iscsi
State: ready
I_T nexus information:
I_T nexus: 5
Initiator: iqn.1991-05.com.microsoft:blackbird
Connection: 1
IP Address: 192.168.216.2
LUN information:
LUN: 0
Type: controller
SCSI ID: IET 00050000
SCSI SN: beaf50
Size: 0 MB, Block size: 1
Online: Yes
Removable media: No
Readonly: No
Backing store type: null
Backing store path: None
Backing store flags:
LUN: 1
Type: disk
SCSI ID: IET 00050001
SCSI SN: beaf51
Size: 209716 MB, Block size: 512
Online: Yes
Removable media: No
Readonly: No
Backing store type: rdwr
Backing store path: /storage/iscsi/iscsi-steam
Backing store flags:
Account information:
ACL information:
ALL
### end of target ###
What seems wrong to me is the blocksize oft he LUN. It states "512" but
the drives I use (WD20EARS) are using 4k Block sizes natively.
So I tried to change the blocksize and according to the mailing list it
should be possible but I can't find how.
So maybe someone here can help me out on this or sees something
obviously wrong in my setup.
FYI
I'm using samba on this server, too which gives me 60MB/s write and
75MB/s read from the same windows machine, so I'm pretty confident my
general network setup is ok.
Any help is greatly appreciated.
Best regards
Marcus
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