Louis-David Mitterrand put forth on 3/30/2011 3:08 AM: > Hi, > > I am seeing horrific performance on a Dell T610 with a LSISAS2008 (Dell > H200) card and 8 WD1002FAEX Caviar Black 1TB configured in mdadm raid6. > > The LSI card is upgraded to the latest 9.00 firmware: > http://www.lsi.com/storage_home/products_home/host_bus_adapters/sas_hbas/internal/sas9211-8i/index.html > and the 2.6.38.2 kernel uses the newer mpt2sas driver. > > On the T610 this command takes 20 minutes: > > tar -I pbzip2 -xvf linux-2.6.37.tar.bz2 22.64s user 3.34s system 2% cpu 20:00.69 total > > where on a lower spec'ed Poweredge 2900 III server (LSI Logic MegaRAID > SAS 1078 + 8 x Hitachi Ultrastar 7K1000 in mdadm raid6) it takes 22 > _seconds_: > > tar -I pbzip2 -xvf linux-2.6.37.tar.bz2 16.40s user 3.22s system 86% cpu 22.773 total > > Besides hardware, the other difference between servers is that the > PE2900's MegaRAID has no JBOD mode so each disk must be configured as a > "raid0" vdisk unit. On the T610 no configuration was necessary for the > disks to "appear" in the OS. Would configuring them as raid0 vdisks > change anything? Changing the virtual disk configuration is a question for Dell support. You haven't provided sufficient information that would allow us to troubleshoot your problem. Please include relevant log and dmesg output. -- Stan -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
