Re: USB-Storage, slow speed with sync option

[Stefan <gentoopower@yahoo.de>]

Lionel Bouton wrote:

> Stefan wrote the following on 14.09.2005 12:43 :
>
>> Erik Slagter wrote:
>>  
>>
>>>
>>> Why would you _ever_ want to use the sync mount option on a flash
>>> device?
>>>
>>>
>>>   
>>
>> Don't ask me:-)
>>
>> I used to mount without sync option, but I switched to hal + dbus now
>> and with gentoo it automatically sets sync option in fstab :-(
>>  
>>
>
> This is purely a PBKAK :
> users want to remove the device as soon as they get feedback from
> their UI telling them that their transfer is done (in fact they even
> screw up and remove the device before it is done). sync in fstab isn't
> particularly clever, but sync with automount is more useful : when
> properly configured, as soon as the transfer is done the automounter
> can cleanly umount the block device which is nearly instantaneous when
> sync is used.


I guess that is what suse must have setup, since I just checked there
and it works smooth although they use sync option.

> Without sync there can be some awfully long delays with flash and huge
> caches (on a 512M slow SD, I saw 30+ seconds after transfering 10s or
> 100s of MB).
>
> This is understandable, for all the removable devices without a clean
> "eject" and VFAT formatted, using sync is probably the best safeguard
> against badly screwed up filesystems.
>
> Lionel.
>


	

	
		
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