On Wednesday, August 14, 2013 10:33:31 AM Felix Miata wrote:
On 2013-08-14 12:37 (GMT+0200) Roger Oberholtzer composed:
A bit more information. On the slow system: # hdparm -Tt /dev/sdb
/dev/sdb: Timing cached reads: 27784 MB in 1.99 seconds = 13934.26 MB/sec Timing buffered disk reads: 468 MB in 3.01 seconds = 155.63 MB/sec
# hdparm -Tt /dev/sda
/dev/sda: Timing cached reads: 27776 MB in 1.99 seconds = 13930.08 MB/sec Timing buffered disk reads: 584 MB in 3.00 seconds = 194.66 MB/sec
On a system acting as expected: # hdparm -Tt /dev/sdb
/dev/sdb: Timing cached reads: 6852 MB in 2.00 seconds = 3427.26 MB/sec Timing buffered disk reads: 312 MB in 3.01 seconds = 103.56 MB/sec
So at this level they seem to be okay. Not sure what this tells us.
It seems to confirm Dave's allusion to sector misalignment in the partition tables. Are partitions laid out to align with 4k sectors? How was partitioning on the Velicoraptors done (what tool was used to create)?
The entire disk was set up by openSUSE via KIWI. This aspect of the image is controlled by: <oem-align-partition>true</oem-align-partition> When 'true', Kiwi attempts to align the start sector of the disk partition on a 4K boundary. I am not sure how to verify this. -- Yours sincerely, Roger Oberholtzer Ramböll RST / Systems Office: Int +46 10-615 60 20 Mobile: Int +46 70-815 1696 roger.oberholtzer@ramboll.se ________________________________________ Ramböll Sverige AB Krukmakargatan 21 P.O. Box 17009 SE-104 62 Stockholm, Sweden www.rambollrst.se -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org