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, Blocklevel raid
is dead, in Proc. of the Second USENIX Workshop on Hot topics in Storage and
File systems. USENIX Association, 2010
Author: Dimitar Vlassarev
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nnection, but not many "outbound" (to the Internet) connections.
>
On Jan 10, 2014, at 11:54 AM, Nathan Hruby wrote:
> Most cloud vendors limit throughput based on instance size, did you
> run your cloud test on a varying size of instnaces per vendor, or
> roughly the same s
e’ve hypothesized this as a limit of a site-wide
NAT box or some such, but it seems unlikely. before we go repeat this experiment
with other cloud vendors, does anyone have any comments on what this might be
or if other vendors might do better or worse?
andrew
---
Andrew
a little off the beaten track, but surely dear to our hearts.
https://medium.com/the-physics-arxiv-blog/4487489dbb34
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ain authentication coming into play?
>
> Thanks,
> Leila
>
> On Sep 19, 2013, at 6:14 AM, Andrew Hume wrote:
>
>> i am trying to help figure out a weird incompatibility issue.
>> i am ftp'ing from a linux box to a ftp server running on a windows nt system.
>> when
(be warned, i can't use a different machine at my end because of firewall
issues.)
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DR,
> you just geo-spread it around the country or the world. It's not full
> replication, it's calculated distributed parity using the erasure coding, so
> it's more efficient, but not as fast.
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g list
> tach...@research.att.com
> http://mailman.research.att.com/mailman/listinfo/tachyon
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gt;
> Just you wait. 5 years from now, the scheist will hit the (exabyte) fan.
> Storing data today is one thing, preserving it for decades is quite another.
> HIPAA, anyone?
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r
> available options.
>
>
> On Mon, Jul 22, 2013 at 12:39 PM, Andrew Hume wrote:
> i am looking to store modest amounts of private information
> in one of the Internet's tubes. i want rather more protection than
> just a gmail password. can anyone recommend something?
i am looking to store modest amounts of private information
in one of the Internet's tubes. i want rather more protection than
just a gmail password. can anyone recommend something?
thx
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eliability.
andrew
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dedkeyboard1
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>
> Are you "set -v" by any chance (aka "set -o verbose")? I think verbose mode
> will produce this behavior.
>
> Skylar
nup; set -v is not on.
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s.
(and yes, i've read the wretched turgid bloated man page to no avail.)
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, i recommend using the colour of the cable tie
as the functional designator. this is nearly always good enough, and there
are enough cable ties used to make it relatively easy to track.
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and...@research.att.com
as it turns out, they do support VPC, which is the first i had ever heard of
VPC.
so that does seem to be the best way.
thanks!
On Mar 8, 2013, at 3:16 PM, Brian J. Atkisson wrote:
> On 03/08/2013 08:45 AM, Andrew Hume wrote:
>> does anyone have real experience with ethernet bo
over the 4
channels.
is this a problem? have we misunderstood what mode 6 means?
or is this just because during testing we didn't generate more than 1Gbps
traffic into the sink server?
andrew
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set up a jail and just have the scp binary,
but this seems a fair bit of work for what i would have thought to be a somewhat
common case.
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On Behalf Of Andrew Hume
>>
>> she needs to get whois type information for approx 1M ip addresses in teh
>> US.
>
> Could you clarify that? Because that part of the question doesn't make
> sense.
>
> From an IP address, you could lookup a PTR record ... w
don't know if the other RIRs provide similar services, but a quick search
> of google suggests LACNIC and RIPE do.
>
> --
> Thanks
> Jefferson Cowart
> j...@cowart.net
>
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ndrew
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have reasons for not going with
> a flat network instead, but this is one of the trade-offs to be
> considered.
>
> Tom
> --
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> http://www.TomOnTime.com -- my videos
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?
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fancy features.
>
> Any ideas?
>
> Thanks
>
> Craig
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part of the precipitate"
> - Henry J. Tillman
> "Anyone who has never made a mistake, has never tried anything new." -
> Albert Einstein
> "You don't manage people; you manage things. You lead people." -
> Admiral Grace Hopper, USN
> Life is complex: i
i will check that.
and, OMG, /proc/interrupts
On Oct 17, 2012, at 7:35 PM, Doug Hughes wrote:
> On 10/17/2012 8:22 PM, Andrew Hume wrote:
>>
>> screwed by linux again. sigh.
>>
>> so apparently i am overloading my pathetic linux system with too much tcp/ip
>
its sending window size 0, so i think that absolves the nic, right?
On Oct 17, 2012, at 7:26 PM, Skylar Thompson wrote:
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
>
> On 10/17/2012 05:22 PM, Andrew Hume wrote:
>> screwed by linux again. sigh.
>>
>> so
holy crap!
netstat -s has a lot of stuff in it.
i think i'll try bracketing one of my "events" with this and see what is
cooking.
thanks!
On Oct 17, 2012, at 6:30 PM, Rodrick Brown wrote:
>
>
>
> Sent from my iPhone
>
> On Oct 17, 2012, at 8:49 PM, And
this doesn't exist on my system, and we don't run firewall stuff,
so maybe its not compiled in.
On Oct 17, 2012, at 6:10 PM, da...@lang.hm wrote:
> On Wed, 17 Oct 2012, Andrew Hume wrote:
>
>> screwed by linux again. sigh.
>>
>> so apparently i am overloading
andrew
On Oct 17, 2012, at 8:16 PM, Nathan Hruby wrote:
> On Wed, Oct 17, 2012 at 5:22 PM, Andrew Hume wrote:
>> screwed by linux again. sigh.
>>
>> so apparently i am overloading my pathetic linux system with too much tcp/ip
>> traffic.
>> is there
/proc?
thanks
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running the hardware).
this latter is the most unknown to me;
i assume there is some device that has an internal
sata or ide interface and an external firewire
(or USB?) interface.
can anyone recommend or point me at something useful
for either teh hardware or software?
thanks,
Andrew Hume
ta streaming started working. and has worked flawlessly since. so
despite
the fact that "this minorly defective link couldn't possibly" cause the problem,
it apparently did. (although no-one could explain the mechanism.)
On Sep 13, 2012, at 1:41 PM, John Stoffel wrote:
>>>>
s, i would expect some indication that something has run low or needs
to be increased. what should i look for? are there magic variables to set?
this is on Red Hat enterprise 6.
thanks
------
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t;
> Leon Towns-von Stauber http://www.occam.com/leonvs/
> "We have not come to save you, but you will not die in vain!"
>
> ___
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i have my answer; thanks for all the comments.
On Aug 28, 2012, at 6:09 AM, Jack Coats wrote:
> I think the TSM example is what is showing the strength of the architecture.
> <>
------
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and...@research.att.com (Work)
, Dan Ritter wrote:
> On Mon, Aug 27, 2012 at 06:49:28AM -0700, Andrew Hume wrote:
>> i have some colleagues who are being frustrated by the stupid way
>> Linux measures swap space consumption (the high water mark
>> of currently running processes).
>>
>> does an
i have some colleagues who are being frustrated by the stupid way
Linux measures swap space consumption (the high water mark
of currently running processes).
does anyone know of a way to measure how much swap space is actually being used?
--
Andrew Hume (best -> Telework) +1
e, take a look at the code for GFS, it does what you are trying to
> do, but since it's in the kernel, it may be bypassing some layers that you
> will have trouble bypassing with a completely userspace solution.
>
> David Lang
>
>
> On Wed, 18 Jul 2012, Andrew Hume wrot
point taken.
due to $WORK constraints, the available cluster filesystems can't work
due to firewalls etc.
On Jul 18, 2012, at 3:52 AM, Edward Ned Harvey wrote:
>> From: tech-boun...@lists.lopsa.org [mailto:tech-boun...@lists.lopsa.org]
>> On Behalf Of Andrew Hume
>>
>
>
> (also see deprecated man 8 raw)
>
> On 7/17/2012 11:28 AM, Andrew Hume wrote:
>>
>> i have two linux servers each of which has the same piece of SAN
>> attache dto it as a LUN. that is, svra:/dev/sdbd is the same volume
>> (or more exactly WWN) as svrb:/d
this should work, but on Linux the buffer
cache always inserts doubt. how do i reliably probe
/dev/sdaf for new content? there is no filesystem involved;
i am just talking about raw disk blocks.
thanks in advance.
andrew
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> All servers in a CFS cluster need their production (data, public, whatever
> you call it) IPs in the same subnet and the heartbeats within the same
> layer-2 ethernet network.
>
> -Bryce
>
> On 7/10/12 12:28 PM, Andrew Hume wrote:
>> are they point to point type he
are they point to point type heartbeats?
the pairs are on opposite sides of a firewall.
On Jul 10, 2012, at 10:15 AM, Jeff Wasilko wrote:
> On Tue, Jul 10, 2012 at 09:47:04AM -0700, Andrew Hume wrote:
>> any VCS experts?
>>
>> we want to set up four servers in a si
this?
can each pair be in a different subnetwork or do they all need to belong
to teh same subnetwork for heartbeats etc?
as always, thanks in advance,
andrew
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>
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for what he wanted.
>
> Singer
>
> On Thu, May 31, 2012 at 10:42 AM, Andrew Hume wrote:
> really?
> how about the correct answer?
> unlike many date questions, this seems really clear:
> go back one in the month dimension
> if this leaves you at an inv
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>
> --
>
> Try Pythian managed services risk-free for operational support,
> upgrades/migrations, special projects or increased performance.
>
>
any recommendations for/against any particular flavour of VM?
i will most likely be running RHEL6 inside them, but may be not.
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AT&T Labs - Research; member of USENIX an
apple stuff, but am open to other solutions.
i can, but would rather not, go fishing cables etc. there is a prewired network
of
RG-6 coax that could be used to get signals from teh cable modem (colocated
with teh airport extreme).
any suggestions?
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and practice.
> In practice, there is. Yogi Berra
>
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is if teh data is coming across via a large number of write(2)
calls,
how much overhead is there per write? (and therefore, can i determine the
average
packet size to produce an overhead of 500% by doing solving
(overhead + payload) = 5*payload?)
andrew
------
Andrew H
the client does a stat,
then a clean open, so that shouldn't be the issue.
i'll try doug's suggest of a fclose and fsync.
On Jan 14, 2012, at 8:59 PM, John Stoffel wrote:
>>>>>> "Andrew" == Andrew Hume writes:
>
> Andrew> no doubt
hat is supposed to work.
andrew
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config file to it's working location (this way, if someone changes that
> config file directly in it's working dir, they're also changing the file in
> the repo). I'd organize based on server name or DNS information.
>
> - Zack
--
Andrew Hume
rver1.
what schemes have you liked best for this sort of thing? (and why?)
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I've found it works well with single large files over a high
> bandwidth, high latency link as well, letting me fill the entire pipe
> quite easily. Not quite your setup, but close.
>
> And I think it meets your needs for letting the destination easily
> check for complete file
i was imprecise. my situation is high bandwidth, secure and low latency.
but i have the gist.
On May 4, 2011, at 4:07 PM, da...@lang.hm wrote:
> On Wed, 4 May 2011, Andrew Hume wrote:
>
>> it is time for my annual head-slapping over scp.
>>
>> is there any plausible al
sarcasm???
you know, our foundation architecture mandates scp or connect:direct.
talk about rocks and hard places.
although i am still contemplating the perverse notion of rsyn tunneling through
ssh.
On May 4, 2011, at 8:26 PM, Randal L. Schwartz wrote:
>>>>>> "Andrew&
s completed yet?
>
> I would normally say "Wait for scp to finish. When scp exits then you know
> it finished." ... I can't think of any reason that would be unreasonable,
> except if you have a 3rd application polling as described above...
>
>
>
> F
with the file modes
or (like ftp) allow you to rename the file (say from foo! to foo) after the
copy finished.
of course, the wretched scp faq says "no changes; it has to be like rcp"
which is fine and all, except rcp is a very old piece of crap.
surely we can do better?
---
ch).
On Apr 20, 2011, at 6:37 AM, Charles Jones wrote:
> On Wed, Apr 20, 2011 at 6:25 AM, Andrew Hume wrote:
> i know, i know. this is an old chestnut.
> we used to have swap 2-3x main memory,
> but nowadays the wisdom is that that old rule
> is no longer applicable. (this is on RHE5.
observation is that if i have large memory, i will use it.
(to say nothing of memory leaks etc.)
and if i have a few multiple large memory processes,
why wouldn't i want swap sized at 2-3x memory?
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have
always thought of as a different market, with players like Parnasas.
as normal, we care rather less about IOPS and more about bandwidth
and $ per TB.
anyone (doug??) with comments pro or con for this market?
andrew
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--Andrew Hume (best -> Tele
Jan 13, 2011, at 7:58 AM, Christopher R Webber wrote:
> Just for reference… What is the limoncelli rule?
>
> -- cwebber
>
> From: Andrew Hume
> Date: Wed, 12 Jan 2011 22:06:24 -0700
> To: Andrew Hume
> Cc: tech Discussions
> Subject: Re: [lopsa-tech] how screwed am
i applied the limoncelli rule to enhance my googling
and think i know the answer, namely these prod servers
were installed with runtime versions, and not development versions.
On Jan 12, 2011, at 9:56 PM, Andrew Hume wrote:
> the situation:
>
> we were told the production serv
links.
andrew
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On Dec 23, 2010, at 5:44 PM, Tracy Reed wrote:
> On Thu, Dec 23, 2010 at 04:29:40PM -0700, Andrew Hume spake thusly:
>> 7) power supplies doug's point is well taken. one thing i would
>> investigate
>> hard before building more is fabricating the wiring harnass s
power supply failures by replicating files across a pair of
backblazes, instead of within
each backblaze.
as always, thanks for the feedback.
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(specificly, not RAID5).
does anyone have anything specific to say about mdadm,
and the raid it produces, either good or bad?
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ng is done poorly,
cable failures are our second biggest failure cause (after disk).
------
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ow do i get a migration assistant for 10.4.x?
is there another way?
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otch to me.
but nevertheless, it all works now.
thanks for the other replies, tho.
On Nov 14, 2010, at 4:30 PM, Andrew Hume wrote:
well, i am stumped.
once, we were happy. we had a wifi HP printer and all could print.
all our max os x versions were 10.4.something.
then, we upgraded one mac-min
on the mac mini. if i force the laptop to do the same IPP thing, it
too fails.
any suggestions?
------
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