Re: Cloud Backup
I think Shachar is missing one point about S3 and similar amazon services. You are assuming that amazon created infrastructure specifically for S3. S3 and other products is amazon renting off it's over-capacity, as such it *pays* for amazon to have a very reliable and stable infrastructure because it's for their total business and amazon.com being down probably costs them in the order of millions per second. That is why for amazon it pays to make big investments in infrastructure and renting space there is probably mainly offsetting the cost of building very robust infrastructure... Now they probably invest in extra infrastructure specifically for S3 and similar products... Other then that no one in their right mind making even 5 nines SLA claims will accepts responsibility for downtime you suffer as a result of problems on your side, I the company commit that my systems will be available and reachable from the Internet, if your ISP has a problem you can't blame me (that's why I built datacenters in multiple locations all over the world and you can fail-over instantly and transparently to any of them). I don't work for amazon, but this is what it looks like from my end. Regards, Eliyahu - אליהו 2013/5/18 Ghiora Drori ghioradr...@gmail.com: Shachar Shemesh enjoys being rude and wrong. I suggest he install new fuses. On Fri, May 17, 2013 at 10:05 AM, Shachar Shemesh shac...@shemesh.biz wrote: On 17/05/13 11:43, Oleg Goldshmidt wrote: Shachar Shemesh shac...@shemesh.biz writes: On 17/05/13 10:13, Ghiora Drori wrote: https://aws.amazon.com/glacier/#highlights Quote: Amazon Glacier is designed to provide average annual durability of 99.9% If this is not good enough for you too bad. When you see someone, anyone, saying such a thing, run. As fast and as far as you can. This level of assurance is called nine nines(henceforth 9*9). It amounts to one thousandth of a second of downtime a year. I think you are misreading the claim, Shachar. It is not about availablity, it is about durability. I read it as a measure of the probability that your data will not be lost before a year passes. You are right that this is not about availability. The previous response was my fuse jumping because of the pure ludiciority of people claiming 9*9 availability. After reading the actual text, however, it is not clear what it is about. It is possible that this means that they will lose (on average) ten bits per Terabyte per year. If that is the case, honestly, this does not sound very good. Assuming they have several exabytes of customers data, this means that they have several actual cases of customer data lose all the time. Not a particularly good track record. Or, and this is the more likely scenario, they are talking out of their asses, and put the number in because it sounds impressive. Omer Zak wrote: IMO, the quote does not promise a nine nines assurance. It only says that Amazon Glacier WAS DESIGNED to provide this kind of assurance. See my previous comment for why this is equally ludicrous. Shachar Disclaimer: I have never used the service and th above is my common sense and reading comprehension take on what is written in the above website. -- Mark Twain - If you don't read the newspaper, you're uninformed. If you read the newspaper, you're mis-informed. ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
help with conserver
dear linux-il folks, i thought i might try here before the conserver mailing list. i have a nice little setup of a soekris net4801 (http://soekris.com/products/net4801.html) that serves (with a minimal debian and mpd) as a music box. the only way to communicate with it other than networking (wlan or ethernet) is the serial console. now,occasionally, i want to access the console without hooking up the serial cable, because i'm lazy. i found conserver (http://www.conserver.com), which is supposed to do just that - allow remote access to the actual console device. the problem is it doesn't work for me for whatever reason. i'm able to connect to the server, attach to the console, but then it freezes and i can do nothing except use the escape sequence to quit. if i'm already connected at the same time to the console with the cable (of course it can't really work together, this is just for testing), i can actually see characters being sent to the console, but with no apparent response, as if it's just displayed instead of being taken as commands. if anyone's interested i can attach logs etc. thanks a lot, ido ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Re: help with conserver
On Mon, May 20, 2013 at 3:19 AM, Ido Admon ido...@gmail.com wrote: dear linux-il folks, i thought i might try here before the conserver mailing list. i have a nice little setup of a soekris net4801 (http://soekris.com/products/net4801.html) that serves (with a minimal debian and mpd) as a music box. the only way to communicate with it other than networking (wlan or ethernet) is the serial console. now,occasionally, i want to access the console without hooking up the serial cable, because i'm lazy. i found conserver (http://www.conserver.com), which is supposed to do just that - allow remote access to the actual console device. the problem is it doesn't work for me for whatever reason. i'm able to connect to the server, attach to the console, but then it freezes and i can do nothing except use the escape sequence to quit. if i'm already connected at the same time to the console with the cable (of course it can't really work together, this is just for testing), i can actually see characters being sent to the console, but with no apparent response, as if it's just displayed instead of being taken as commands. But is the console actually 'listening' ? I mean, do you have [a]getty running and everything? (see http://www.cyberciti.biz/faq/howto-setup-serial-console-on-debian-linux/) I would assume that it is, because from your wording, I understand that sometimes you do use the physical serial connection with success... but I have to ask. The next question would of course be if conserver console was set to type 'device' and the device path was set to the device file name of a serial console listening with the aforementioned getty ? And the buadrate, start/stop bit, parity, all match to what has been set on getty? -- Shimi ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Re: help with conserver
It was a peachy Monday, May 20 2013, 06:02:58 when shimi
linux...@shimi.net wrote:
On Mon, May 20, 2013 at 3:19 AM, Ido Admon ido...@gmail.com wrote:
dear linux-il folks,
i thought i might try here before the conserver mailing list. i
have a nice little setup of a soekris net4801
(http://soekris.com/products/net4801.html) that serves (with a
minimal debian and mpd) as a music box. the only way to communicate
with it other than networking (wlan or ethernet) is the serial
console. now,occasionally, i want to access the console without
hooking up the serial cable, because i'm lazy. i found conserver
(http://www.conserver.com), which is supposed to do just that -
allow remote access to the actual console device. the problem is it
doesn't work for me for whatever reason. i'm able to connect to the
server, attach to the console, but then it freezes and i can do
nothing except use the escape sequence to quit.
if i'm already connected at the same time to the console with the
cable (of course it can't really work together, this is just for
testing), i can actually see characters being sent to the console,
but with no apparent response, as if it's just displayed instead of
being taken as commands.
But is the console actually 'listening' ?
I mean, do you have [a]getty running and everything? (see
http://www.cyberciti.biz/faq/howto-setup-serial-console-on-debian-linux/)
I would assume that it is, because from your wording, I understand
that sometimes you do use the physical serial connection with
success... but I have to ask.
The next question would of course be if conserver console was set to
type 'device' and the device path was set to the device file name of
a serial console listening with the aforementioned getty ? And the
buadrate, start/stop bit, parity, all match to what has been set on
getty?
-- Shimi
hi shimi, thanks. yes, i'm sorry if i wasn't clear enough. the console
is working flawlessly when physically connected. here's my conserver.cf
(192.168.43.168 is my laptop):
root@krzysztof:~# cat /etc/conserver/conserver.cf
# The character '' in logfile names are substituted with the console
# name.
#
config * {
}
default * {
logfile /var/log/conserver/.log;
timestamp ;
rw *;
}
console serial {
master localhost;
type device;
device /dev/ttyS0;
baud 19200;
parity none;
}
access * {
trusted 192.168.43.168;
trusted 127.0.0.1;
}
and the relevant line in inittab:
root@krzysztof:~# grep ttyS0 /etc/inittab
T0:23:respawn:/sbin/getty -L ttyS0 19200 vt100
and what setserial says:
root@krzysztof:~# setserial /dev/ttyS0
/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4
thanks again!
ido
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Re: help with conserver
It was a peachy Monday, May 20 2013, 00:14:42 when Ido Admon
ido...@gmail.com wrote:
It was a peachy Monday, May 20 2013, 06:02:58 when shimi
linux...@shimi.net wrote:
On Mon, May 20, 2013 at 3:19 AM, Ido Admon ido...@gmail.com wrote:
dear linux-il folks,
i thought i might try here before the conserver mailing list. i
have a nice little setup of a soekris net4801
(http://soekris.com/products/net4801.html) that serves (with a
minimal debian and mpd) as a music box. the only way to
communicate with it other than networking (wlan or ethernet) is
the serial console. now,occasionally, i want to access the
console without hooking up the serial cable, because i'm lazy. i
found conserver (http://www.conserver.com), which is supposed to
do just that - allow remote access to the actual console device.
the problem is it doesn't work for me for whatever reason. i'm
able to connect to the server, attach to the console, but then it
freezes and i can do nothing except use the escape sequence to
quit. if i'm already connected at the same time to the console
with the cable (of course it can't really work together, this is
just for testing), i can actually see characters being sent to
the console, but with no apparent response, as if it's just
displayed instead of being taken as commands.
But is the console actually 'listening' ?
I mean, do you have [a]getty running and everything? (see
http://www.cyberciti.biz/faq/howto-setup-serial-console-on-debian-linux/)
I would assume that it is, because from your wording, I understand
that sometimes you do use the physical serial connection with
success... but I have to ask.
The next question would of course be if conserver console was set to
type 'device' and the device path was set to the device file name of
a serial console listening with the aforementioned getty ? And the
buadrate, start/stop bit, parity, all match to what has been set on
getty?
-- Shimi
hi shimi, thanks. yes, i'm sorry if i wasn't clear enough. the console
is working flawlessly when physically connected. here's my
conserver.cf (192.168.43.168 is my laptop):
root@krzysztof:~# cat /etc/conserver/conserver.cf
# The character '' in logfile names are substituted with the console
# name.
#
config * {
}
default * {
logfile /var/log/conserver/.log;
timestamp ;
rw *;
}
console serial {
master localhost;
type device;
device /dev/ttyS0;
baud 19200;
parity none;
}
access * {
trusted 192.168.43.168;
trusted 127.0.0.1;
}
and the relevant line in inittab:
root@krzysztof:~# grep ttyS0 /etc/inittab
T0:23:respawn:/sbin/getty -L ttyS0 19200 vt100
and what setserial says:
root@krzysztof:~# setserial /dev/ttyS0
/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4
thanks again!
ido
ok, i'm an idiot. of course /dev/ttyS0 is not the console itself but the
serial device. that's not going to work. but /dev/console doesn't work
either, and it seems that conserver can't actually do what i want,
which is to access the local console, not some other server connected
via the serial port. i'm not sure how, if at all, it can be done.
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Re: help with conserver
On Mon, May 20, 2013 at 7:25 AM, Ido Admon ido...@gmail.com wrote:
hi shimi, thanks. yes, i'm sorry if i wasn't clear enough. the console
is working flawlessly when physically connected. here's my
conserver.cf (192.168.43.168 is my laptop):
root@krzysztof:~# cat /etc/conserver/conserver.cf
# The character '' in logfile names are substituted with the console
# name.
#
config * {
}
default * {
logfile /var/log/conserver/.log;
timestamp ;
rw *;
}
console serial {
master localhost;
type device;
device /dev/ttyS0;
baud 19200;
parity none;
}
access * {
trusted 192.168.43.168;
trusted 127.0.0.1;
}
and the relevant line in inittab:
root@krzysztof:~# grep ttyS0 /etc/inittab
T0:23:respawn:/sbin/getty -L ttyS0 19200 vt100
and what setserial says:
root@krzysztof:~# setserial /dev/ttyS0
/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4
thanks again!
ido
ok, i'm an idiot. of course /dev/ttyS0 is not the console itself but the
serial device. that's not going to work. but /dev/console doesn't work
either, and it seems that conserver can't actually do what i want,
which is to access the local console, not some other server connected
via the serial port. i'm not sure how, if at all, it can be done.
Truth to be told, I really did wonder how this is supposed to work (I never
used conserver; What you're trying to do is typically done in the IT world
by devices like this:
http://www.perle.com/products/IOLAN-DS-Terminal-Server.shtml ... usually
with 16 ports and beyond...) - but I assumed you researched this and found
that it's supposed work :)
I have to wonder, what is so special on the serial console that you want to
specifically use it? I mean, if you have to go over IP anyways, what does
it matter if it's 'serial' or not? The usual advantage of serial (IMHO) is
being out-of-band and not dependent on the machine's networking
configuration, which is not the case here, obviously. The other is maybe
the output of kernel messages (but that goes into files, or even to remote
machines if set up correctly).
Maybe you don't want the SSH encryption overhead? You could run telnetd
instead... or conserver can be used with 'exec' instead of 'device' if you
want the parallel connections feature.
So, what is the purpose? :)
-- Shimi
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Re: help with conserver
It was a peachy Monday, May 20 2013, 07:52:21 when shimi
linux...@shimi.net wrote:
On Mon, May 20, 2013 at 7:25 AM, Ido Admon ido...@gmail.com wrote:
hi shimi, thanks. yes, i'm sorry if i wasn't clear enough. the
console is working flawlessly when physically connected. here's my
conserver.cf (192.168.43.168 is my laptop):
root@krzysztof:~# cat /etc/conserver/conserver.cf
# The character '' in logfile names are substituted with the
console # name.
#
config * {
}
default * {
logfile /var/log/conserver/.log;
timestamp ;
rw *;
}
console serial {
master localhost;
type device;
device /dev/ttyS0;
baud 19200;
parity none;
}
access * {
trusted 192.168.43.168;
trusted 127.0.0.1;
}
and the relevant line in inittab:
root@krzysztof:~# grep ttyS0 /etc/inittab
T0:23:respawn:/sbin/getty -L ttyS0 19200 vt100
and what setserial says:
root@krzysztof:~# setserial /dev/ttyS0
/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4
thanks again!
ido
ok, i'm an idiot. of course /dev/ttyS0 is not the console itself
but the serial device. that's not going to work. but /dev/console
doesn't work either, and it seems that conserver can't actually do
what i want, which is to access the local console, not some other
server connected via the serial port. i'm not sure how, if at all,
it can be done.
Truth to be told, I really did wonder how this is supposed to work (I
never used conserver; What you're trying to do is typically done in
the IT world by devices like this:
http://www.perle.com/products/IOLAN-DS-Terminal-Server.shtml ...
usually with 16 ports and beyond...) - but I assumed you researched
this and found that it's supposed work :)
I have to wonder, what is so special on the serial console that you
want to specifically use it? I mean, if you have to go over IP
anyways, what does it matter if it's 'serial' or not? The usual
advantage of serial (IMHO) is being out-of-band and not dependent on
the machine's networking configuration, which is not the case here,
obviously. The other is maybe the output of kernel messages (but that
goes into files, or even to remote machines if set up correctly).
Maybe you don't want the SSH encryption overhead? You could run
telnetd instead... or conserver can be used with 'exec' instead of
'device' if you want the parallel connections feature.
So, what is the purpose? :)
-- Shimi
oh just doing everything in the most convoluted way possible :) the
idea was to have a shell session that's always on, so to speak, but i
guess nohup can help with that somewhat. you're right, of course, in
saying that being dependent on the network makes the whole idea
pointless. thanks for clarifying things for me!
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