ISCSI slow to read from DELL MD3000i
Sossi Andrej
asossi at dotcom.ts.it
Mon Jan 5 17:18:11 UTC 2009
Hello,
I manage an web/mail/DB server. We recently purchased a DELL MD3000i
server with ISCSI interface. I tested the MD3000i with FreeBSD
7.0-RELEASE, i recompiled the kernel myself but the ISCSI communication
results slow.
Below configuration:
net configuration:
MD3000i
FreeBSD 7.0
controller 0 interface 0: 192.168.253.254 |__| switch 1GB
|__|netcard 0: 192.168.253.1 (re0)|
controller 1 interface 0: 192.168.253.253 | |192.168.253.X | |
|
|
|
|
controller 0 interface 1: 192.168.252.254 |__| switch 1GB
|__|netcard 1: 192.168.252.1 (re1)|
controller 1 interface 1: 192.168.252.253 | |192.168.252.X | |
|
manage interface 0: 192.168.0.249 |__| switch 10/100 MB |_....
internal net
manage interface 1: 192.168.0.248 | |192.168.0.X |
/etc/iscsi.conf:
port 3260
nas_dotcom {
TargetAddress = 192.168.253.254
TargetName =
iqn.1984-05.com.dell:powervault.6001ec9000f192210000000048a44372
initiatorName = iqn.2005-01.il.ac.huji.cs::web.dotcom.ts.it
}
web# sysctl net.iscsi
net.iscsi.driver_version: 2.1.0
net.iscsi.isid: €DIB00
net.iscsi.sessions: 1
net.iscsi.0.targetname:
iqn.1984-05.com.dell:powervault.6001ec9000f192210000000048a44372
net.iscsi.0.targeaddress: 192.168.253.254
net.iscsi.0.stats: recv=71479 sent=71479 flags=0x0000019f pdus-alloc=0
pdus-max=5 cws=385 cmd=b499 exp=b499 max=b619 stat=b49b itt=b499
net.iscsi.0.douio: 0
net.iscsi.0.pid: 612
web# sysctl kern.cam
kern.cam.cam_srch_hi: 0
kern.cam.scsi_delay: 5000
kern.cam.cd.changer.max_busy_seconds: 15
kern.cam.cd.changer.min_busy_seconds: 5
kern.cam.da.da_send_ordered: 1
kern.cam.da.default_timeout: 60
kern.cam.da.retry_count: 4
kern.cam.da.0.minimum_cmd_size: 6
kern.cam.da.1.minimum_cmd_size: 6
kern.cam.da.2.minimum_cmd_size: 6
kern.cam.da.3.minimum_cmd_size: 6
I tryed with the ISCSI driver I found in FreeBSD 7.0, with the same
driver patched with the patch I found there
(http://lists.freebsd.org/pipermail/freebsd-scsi/2008-February/003383.html)
and alse with the driver ISCSI 2.1 downloaded from Danny's ftp.
All test have same results: about 820~850KB/s.
eg:
web# dd if=/dev/zero of=/usr/local/www/tmp count=1m
1048576+0 records in
1048576+0 records out
536870912 bytes transferred in 654.398700 secs (820403 bytes/sec)
and simultaneously
web# netstat -w 1 -I re0
input (re0) output
packets errs bytes packets errs bytes colls
0 0 0 0 0 0 0
123 0 8550 234 0 343180 0
300 0 20952 564 0 824808 0
325 0 22698 611 0 893542 0
300 0 20952 564 0 824808 0
325 0 22698 611 0 893542 0
300 0 20952 564 0 824808 0
.... and more
re1 has no traffic.
But at the end i try read from ISCSI. Read is more quickly.
eg:
web# dd if=/usr/local/www/tmp of=/usr/tmp
1048576+0 records in
1048576+0 records out
536870912 bytes transferred in 19.636577 secs (27340351 bytes/sec)
and simultaneously:
web# netstat -w 1 -I re0
input (re0) output
packets errs bytes packets errs bytes colls
0 0 0 0 0 0 0
2210 0 3296084 1156 0 78744 0
16420 0 24493888 8567 0 582558 0
13031 0 19427130 6809 0 463074 0
20638 0 30786236 10768 0 732288 0
17296 0 25791540 9032 0 614160 0
20347 0 30347462 10615 0 721854 0
20254 0 30210156 10567 0 718590 0
.... and more
re1 has no traffic.
I searched but found nothing that helps me, the only thing that
triggered my attention was this Microsoft's User's Guide
(http://www.microsoft.com/downloads/details.aspx?familyid=12CB3C1A-15D6-4585-B385-BEFD1319F825&displaylang=en).
It seems interesting at least the chapter 'Addressing Slow Performance
with iSCSI clusters'
Thanks in advance for yours help.
--
Sossi Andrej
-------------------------
DotCom Information technology
Via Biancospino, 9
34151 - Opicina (TS)
Italy
tel: +39 040 2158191
fax: +39 040 0641954
E-mail: asossi at dotcom.ts.it
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