remote directory/partition

[Jonathan Ben Avraham]

On Sun, 23 Oct 2011, Yedidyah Bar-David wrote:

> Date: Sun, 23 Oct 2011 09:27:34 +0200
> From: Yedidyah Bar-David <linux-il at didi.bardavid.org>
> To: Hetz Ben Hamo <hetzbh at gmail.com>
> Cc: ILUG <linux-il at cs.huji.ac.il>
> Subject: Re: remote directory/partition
> 
> On Sat, Oct 22, 2011 at 11:03:49PM +0200, Hetz Ben Hamo wrote:
>> Hi,
>>
>> Here is a theoretical question:
>>
>> Lets say I have a Linux server in Israel, and I have a block of storage
>> (lets say iSCSI partition for this example) in USA, and I want to mount it
>> on my server in Israel.
>> iSCSI over such a long distance and with big latency (thanks to our ISP's)
>
> Not sure it's mainly the ISPs, BTW. You do also depend on the physics of
> speed of light.

If you use IP over nutrino-based transport you might be able to shave a 
few nanoseconds off the speed of light, see this: 
http://www.wired.com/wiredscience/2011/09/neutrinos-faster-than-light/
Shavua tov,

  - yba



>> is a big no no, it's too slow. NFS is also not a good idea (here's
>> why<http://goo.gl/vn4GM>
>> ).
>>
>> I can take this storage, format it and export it from my server in USA, but
>> which protocol would give me:
>>
>>    1. All (or almost all) functionality of a local mounted device
>
> Do you need it read/write on both sides? If so, you are going to have
> big problems if the link is cut.
>
>>    2. Can work with long distance latencies
>>    3. won't "kill" the machine if the remote directory is disconnected /
>>    "disappeared"
>>    4. If possible - supported (either directly or using 3rd party driver) on
>>    Windows 2008 (Linux is the main concern, Windows is optional)
>
> I used drbd on a LAN, and know that it can theoretically work rather well
> on larger distance when used as read-write on one side only. They also
> have a pay-for tool to do this asyncronously called drbd proxy. This
> implies using a local copy and have drbd sync it. You can choose between
> three what they call "Protocols" to affect the perceived local latency.
>

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