ISCSI slow to read from DELL MD3000i
Danny Braniss
danny at cs.huji.ac.il
Tue Jan 6 13:49:35 UTC 2009
sorry for the top potst, my MUI screws up the quoatet message.
check:
ftp://ftp.cs.huji.ac.il/users/danny/freebsd/iscsi-2.1.tar.gz
danny
> 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-allo=c=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.htm=l) > 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> ----------------------------> > Ai sensi del D.lgs n. 196 del 30.06.03 (Codice Privacy) si precisa che le= informazioni contenute in questo messaggio sono riservate e ad uso esclu=sivo del destinatario. Qualora il messaggio in parola Le fosse pervenuto =per errore, La preghiamo di eliminarlo senza copiarlo e di non inoltrarlo= a terzi, dandocene gentilmente comunicazione. Grazie> > This message, for the D.lgs n. 196 / 30.06.03 (Privacy Code), may contain= confidential and/or privileged information. If you are not the addressee= or authorized to receive this for the addressee, you must not use, copy,= disclose or take any action based on this message or any information her=ein. If you have received this message in error, please advise the sender= immediately by reply e-mail and delete this message. Thank you for your =cooperation.> > _______________________________________________> freebsd-scsi at freebsd.org mailing list> http://lists.freebsd.org/mailman/listinfo/freebsd-scsi> To unsubscribe, send any mail to "freebsd-scsi-unsubscribe at freebsd.org">
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