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? Thanks in advance for any suggestion, -- 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
