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 08:46:18 +0200
  • Message-id: <2643006.beiBeS6Alc@acme>
On Thursday, August 15, 2013 08:13:02 AM Per Jessen wrote:

Wouldn't/couldn't openSUSE be controlling that?

I don't think so, no - I don't know of anywhere in openSUSE where you're
able to specify it.

Via hdparam perhaps? Another person in this thread reported that their disk
also has write cache enabled. And that was on a laptop where power loss is
more common than a system on a UPS. So maybe more poeple have this than
expect.

I just checked a few more 12.3 systems, and I see things like:

sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support
DPO or FUA
sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support
DPO or FUA
sd 2:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support
DPO or FUA
sd 3:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support
DPO or FUA
sd 4:0:0:0: [sde] Write cache: enabled, read cache: enabled, doesn't support
DPO or FUA
sd 8:0:0:0: [sdf] Write cache: enabled, read cache: enabled, doesn't support
DPO or FUA
sd 9:0:0:0: [sdg] Write cache: enabled, read cache: enabled, doesn't support
DPO or FUA
sd 12:0:0:0: [sdh] Write cache: enabled, read cache: enabled, doesn't support
DPO or FUA


In fact, I do not see any systems locally where disk write cache is not
enabled. There is a mix of Seagate and Western Digital SATA disks. My oldest
10.0 system (soon to be replaced...) has write cache enabled for an old
Seagate ATA disk.

hdparm -I /dev/hda

Commands/features:
Enabled Supported:
* READ BUFFER cmd
* WRITE BUFFER cmd
* Host Protected Area feature set
* Look-ahead
* Write cache
* Power Management feature set
Security Mode feature set
* SMART feature set
* FLUSH CACHE EXT command
* Mandatory FLUSH CACHE command
* Device Configuration Overlay feature set
* 48-bit Address feature set
SET MAX security extension
* DOWNLOAD MICROCODE cmd
* SMART self-test
* SMART error logging

Perhaps I am looking at this in the wrong way?

--
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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