Re: [gentoo-user] Re: Copying USB->USB: sync after every file

[Frank Steinmetzger]

On Mon, Jan 23, 2017 at 09:14:22AM -0800, Ian Zimmerman wrote:
> On 2017-01-23 16:50, Frank Steinmetzger wrote:
>
> > I need a pointer, please. Something is amiss on my laptop’s
> > setup. When I copy a number of big files (i.e. videos) from one USB
> > device to another, it starts to read the file, then after a few
> > seconds starts to write to the destination and only *after* that file
> > has been completely written, it continues with the next file.
>
> What are the mount options on the USB drives?

My external HDD:
/dev/sdb1 on /run/media/frank/Volume type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096,uhelper=udisks2)
My USB stick:
/dev/sdc1 on /run/media/frank/SYSRESC type vfat (rw,nosuid,nodev,relatime,uid=1000,gid=1000,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,showexec,utf8,flush,errors=remount-ro,uhelper=udisks2)


I tried to reproduce the problem with those two devices, but this time I had
no issue. There are several possible reasons I can think of:
- Different file system. I think the affected HDD runs on FAT.
- Simply a different device with different characteristics. :?
- I finally bit the bullet and upgraded KDE 4→5 yesterday. Perhaps it uses
  different mount options.
We will have to wait till Thursday night, b/c that's when I will have access
to the devices in question again (they're not my own).


Here is the requested info from /proc/sys/vm. It is identical between my
unaffected PC and the laptop:
tp /proc/sys/vm # grep . dirty* laptop_mode
dirty_background_bytes:0
dirty_background_ratio:5
dirty_bytes:0
dirty_expire_centisecs:3000
dirty_ratio:10
dirtytime_expire_seconds:43200
dirty_writeback_centisecs:500
laptop_mode:0

So see you on Thursday or a bit thereafter.
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