[CentOS] Write to USB pendrives horribly slow

wwp subscript at free.fr
Wed Jan 11 12:42:06 EST 2012


Hello Ljubomir,


On Wed, 11 Jan 2012 16:31:43 +0100 Ljubomir Ljubojevic <office at plnet.rs> wrote:

> On 01/11/2012 08:45 AM, wwp wrote:
> > Hello John,
> >
> >
> > On Tue, 10 Jan 2012 08:57:14 -0800 (PST) John Doe<jdmls at yahoo.com>  wrote:
> >
> >> From: wwp<subscript at free.fr>
> >>
> >>> I wonder if some mount options aren't wrong with USB pendrives, see:
> >>>    /dev/sdd1 on /media/monolith type vfat
> >>> (rw,nosuid,nodev,uhelper=udisks,shortname=mixed,dmask=0077,utf8=1,flush)
> >>> my suspicion is about the flush option, which I find atypical here.
> >>
> >> I guess it is to be safe in case users remove their usb keys without
> >> unmounting first...
> >
> > OK, meaning no write-cache for those devices, makes sense in some
> > way. But this doesn't explain the main issue I reported, although I
> > didn't find a way to change the default mount options used by Gnome
> > (gconf settings don't match those that are used).
> >
> >
> 
> Do you have ehci_hcd module running?
> 
> Do you have any error messages in dmesg after you plug it in?

ehci_hcd does manage my devices (it's not a loadable module, apparently
compiled in kernel instead), see for instance:

kernel: usb 2-2: new high speed USB device using ehci_hcd and address 28
kernel: usb 2-2: New USB device found, idVendor=18a5, idProduct=0300
kernel: usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
kernel: usb 2-2: Product: STORE N GO
kernel: usb 2-2: Manufacturer: Verbatim
kernel: usb 2-2: SerialNumber: 25LHXEWIZ5IZKSO0
kernel: usb 2-2: configuration #1 chosen from 1 choice
kernel: scsi26 : SCSI emulation for USB Mass Storage devices
kernel: scsi 26:0:0:0: Direct-Access	 Verbatim STORE N GO	   1100 PQ: 0 ANSI: 0 CCS
kernel: sd 26:0:0:0: Attached scsi generic sg4 type 0
kernel: sd 26:0:0:0: [sdd] 31506432 512-byte logical blocks: (16.1 GB/15.0 GiB)
kernel: sd 26:0:0:0: [sdd] Write Protect is off
kernel: sd 26:0:0:0: [sdd] Assuming drive cache: write through
kernel: sd 26:0:0:0: [sdd] Assuming drive cache: write through
kernel: sdd: sdd1
kernel: sd 26:0:0:0: [sdd] Assuming drive cache: write through
kernel: sd 26:0:0:0: [sdd] Attached SCSI removable disk

No error AFAICS.


Regards,

-- 
wwp
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