Mailinglist Archive: opensuse (880 mails)

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Re: [opensuse] Slow file copying on openSUSE 12.3
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)?
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"The wise are known for their understanding, and pleasant
words are persuasive." Proverbs 16:21 (New Living Translation)

Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata *** http://fm.no-ip.com/
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