On Mon, Dec 08, 2008 at 02:17:45PM +0200, Pasi Kärkkäinen wrote: > > On Sun, Dec 07, 2008 at 11:01:46AM -0800, Kmec wrote: > > > > Hi, > > I would like to ask for help with some strange behavior of linux > > iscsi. Situation is as follows: iSCSI SAN Dell Equallogic, SAS 10k RPM > > drives, 4x Broadcom NIC or 4x Intel NIC in Dell R900 server (24 cores, > > 64 GB RAM). It's testing environment where we are trying to measure > > SAN Dell EQL performance. > > > > Totally we are solving 2 different issues: > > 1) In case of running IOmeter test on server running Windows 2008 > > server, we are able to get 112 MBps read and 110 MBps write over 1NIC, > > 220 MBps read and 210 MBps over 2 NICs. On SuSE 10 or Centos 66 MBps > > read and 38 MBps write only over one NIC. So I think we can forget > > about finding issues on SAN or switch. Strange is, that with dd or > > hdparm we can get wirespeed. Question is what to do to get same > > numbers from IOmeter on Windows and Linux. We also tried dt tool and > > we get same results as from IOmeter. > > How to continue? > > > > IIRC IOmeter for Linux had some issues.. related to queue depth maybe? So > you should use other tools than IOmeter on Linux. Dunno if that problem is > already fixed or if there is a patch available for IOmeter for Linux.. >
Oh, and please try using 'noop' elevator/scheduler on your iSCSI disks.. that might help with the performance. -- Pasi --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "open-iscsi" group. To post to this group, send email to open-iscsi@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/open-iscsi -~----------~----~----~----~------~----~------~--~---
