On 11/06/2018 09:56 AM, Rick Stevens wrote:
On 11/5/18 10:03 PM, Paul Allen Newell wrote:
ToddAndMargo:
I am struggling with this one as well. To the best of my googling, it
seems that the "sync" command needs to be done before clicking "safely
remove" (or whatever). Documentation also says that "sudo umount
<stick>" should do it, but I have experienced at least one instance
where it didn't seem like it worked ... not certain what happened.
I am still testing but I "think" I am seeing that doing a "safely
remove" and then a sync before physically removing gives best result (as
in no pop-up warning). Do not understand why this is.
Not happy that the led light is vanishing on newer sticks ...
The "sync" command does not appear to be all that nice to the stick and
there doesn't appear to be any way to isolate the "sync" to the stick.
If you issue the sync command, give it a "-f" and specify a file on that
stick (perhaps the root of the filesystem):
sync -f /flash/mountpoint/
then it should only sync the filesystem on /flash/mountpoint.
I would hope that someone on this user-list who is more knowledgeable
will correct me with a better way.
That's the best I can offer. Remember that USB and FLASH are a lot
slower than IDE/SATA/SAS stuff.
On 11/05/2018 09:03 PM, ToddAndMargo via users wrote:
Hi All,
I am starting to use flash drive s with no led activity indicator.
In my scripts that write to them, I am able to umount then watch
the blinking lights to make sure it is done before removing them
But with no led indicator, how can I test from my script to
make sure it is done writing?
As far as I know, there's no way to reliably tell if everything has
been flushed to the media. The sync command above shouldn't return until
it's complete, so if you include it in your script, you should be OK.
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer, AllDigital ricks@xxxxxxxxxxxxxx -
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- You know the old saying--any technology sufficiently advanced is -
- indistinguishable from a Perl script -
- --Programming Perl, 2nd Edition -
----------------------------------------------------------------------
Rick:
Thanks for reply. I went through a bunch on man pages that do not list
the -f option. After getting your email, I went looking for a bunch more
and finally found one that had the -f and -d option.
I note that 'sync --help' only provides 'Usage: sync [OPTION]' without
listing what the options are. I have just followed their suggestion of
running "info coreutils 'sync invocation'" which gives alot of options.
Not certain why these options are more readily visible. I probably
should have dug deeper but after a bunch of online docs showing no
options I just figured there weren't any.
Paul
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