Mailinglist Archive: opensuse (880 mails)

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Re: [opensuse] Slow file copying on openSUSE 12.3
  • From: Roger Oberholtzer <roger@xxxxxx>
  • Date: Thu, 15 Aug 2013 07:34:41 +0200
  • Message-id: <4277752.AQ9LMRztWI@acme>
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@xxxxxxxxxx
________________________________________

Ramböll Sverige AB
Krukmakargatan 21
P.O. Box 17009
SE-104 62 Stockholm, Sweden
www.rambollrst.se
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