[9fans] [plan9mod] Query regarding venti scores
Hello All, I have a query regarding the scores in venti. Here is my question: Since the venti scores are SHA-1 hashes, can they be considered as UUIDs? I have two different venti servers and am storing different sets of databolcks on each. I am wondering whether a scenario will arise where server A and server B gives the same score for completely different datablocks. Any help is greatly appreciated. Thanks in advance. Regards, Anoop
Re: [9fans] [plan9mod] Query regarding venti scores
With today's amount of storage the probability of a collision is too low for that to happen. I read that in the Venti paper[1]. I would not consider them UUIDs though, since the same data blocks will have the same sha-1 hash on both servers. If that doesn't cause a problem you're fine [1] http://plan9.bell-labs.com/sys/doc/venti/venti.pdf On 2/6/09, anoop.an...@gmail.com anoop.an...@gmail.com wrote: Hello All, I have a query regarding the scores in venti. Here is my question: Since the venti scores are SHA-1 hashes, can they be considered as UUIDs? I have two different venti servers and am storing different sets of databolcks on each. I am wondering whether a scenario will arise where server A and server B gives the same score for completely different datablocks. Any help is greatly appreciated. Thanks in advance. Regards, Anoop
[9fans] nupas mk install bug
mk install ... snip ... cp 8.out /386/bin/nupas/Mail cp: can't create /386/bin/nupas/Mail: '/386/bin/nupas' does not exist works ok when I access my Courier server but aborts on nupas/fs/fs.c:157 when I access the imap version of http://fastmail.fm/ I've tried it on two mailboxes, it does this command 9x4 uid fetch 1:* (uid rfc822.size internaldate) then fails parsing the repsonses of the form * 99 FETCH (UID 32768 INTERNALDATE 6-Feb-2009 08:52:33 -0500 RFC822.SIZE 74193) That's as far as I got : Matt
Re: [9fans] nupas mk install bug
On Fri Feb 6 09:17:01 EST 2009, mattmob...@proweb.co.uk wrote: mk install ... snip ... cp 8.out /386/bin/nupas/Mail cp: can't create /386/bin/nupas/Mail: '/386/bin/nupas' does not exist i may be wrong, but that is intentional. i don't know of other plan 9 programs that make their own bin when installed. 9x4 uid fetch 1:* (uid rfc822.size internaldate) then fails parsing the repsonses of the form * 99 FETCH (UID 32768 INTERNALDATE 6-Feb-2009 08:52:33 -0500 RFC822.SIZE 74193) interesting. there's nothing that looks obviously wrong with that line. it must already be out of step. would you mind applying this edit imap.c:1085,1091 - /n/sources/contrib/quanstro/src/nupas/fs//imap.c:1085,1090 } imap = emalloc(sizeof *imap); - imap-flags |= Fdebug; imap-fd = -1; imap-freep = path; imap-flags = flags; and sending along the debugging output? it's going to be a bit chatty. thanks. - erik
Re: [9fans] [plan9mod] Query regarding venti scores
that doesn't directly address their suitability as UUIDs. it seems like an odd choice to me (certainly it's an expensive way of generating them), although i guess it depends what your application is. sha-1 is a standard uuid format. since a uuid is 16 bytes and sha-1 is 20, there should be plenty of room in there. here's the fully legal url: http://en.wikipedia.org/wiki/UUID#Version_5_.28SHA-1_hash.29 - erik
Re: [9fans] nupas mk install bug
when I access the imap version of http://fastmail.fm/ I've tried it on two mailboxes, it does this command 9x4 uid fetch 1:* (uid rfc822.size internaldate) then fails parsing the repsonses thanks for the bug report. i signed up for fastmail.fm to figure out what's going on. there were two independent failures. first, fastmail.fm takes the unusual step of reordering the requested fields. the response parser wasn't able to deal with that. simple fix. the second problem was parsing a list of flags in the return. we didn't ask for flags, but fastmail sent 'em anyway. this part of the fix seems solid, but needs a little more testing. since it's not working for you at all, would you try /n/sources/contrib/quanstro/src/imap.c? replace fs/imap.c with this file and recompile. - erik
[9fans] Handling of other Dir.mode bits
Dir.mode has several bits that don't seem to be defined. Should the protocol be read that optimally conforming clients and servers should pass through the bits, or set them to 0? Aside from the obvious risk of future collisions, is there anything that makes using these bits unsafe? No, this isn't for DMEVIL.
[9fans] Ethernet drivers
Is a D-Link DL10038D supported by the RTL8139 drivers? Are they essentially the same thing? Has anyone tried it? Thanks, ak
Re: [9fans] Ethernet drivers
DL10038D is a success by RTL 8139 drivers on Plan 9. Took it off of a dying computer -- a good hardware investment (though a poor replacement for my Broadcom). yay! ak
Re: [9fans] Ethernet drivers
On Fri, Feb 6, 2009 at 12:01 PM, Akshat Kumar aku...@mail.nanosouffle.net wrote: Is a D-Link DL10038D supported by the RTL8139 drivers? Are they essentially the same thing? Has anyone tried it? do you have one or are you preparing to buy one? ron
Re: [9fans] Ethernet drivers
2009/2/6 ron minnich rminn...@gmail.com: do you have one or are you preparing to buy one? ron Ah, so the situation was that I have a Broadcom on my workstation, and there are no drivers for it on Plan 9. But there are drivers for the RTL8139, and an old box that's just been brought down to me has a D-Link DL10038D card. This is stated (somewhere online) to be a remark of RTL8139, but I'm not sure about the details of that. Anyways, before I placed it in my workstation, I wanted to make sure that it'd actually work. Since no one replied, I went ahead anyways... and voila! It's fine, I have internet on Plan 9 now. Yay! ak
[9fans] FileServer grid
Hello every one... In a context of really heavy load and high availability needs, I'm evaluating plan 9 to implement a fileserver grid to be used by a web server for temporary storage (session's serializations, for example). I'd like to build a Plan 9 grid exposing a unique filesystem mounted by all the web servers. Each session could be accessible from any web server instantly, but what if a fileserver in the grid break? Is there a way to mantain such a session (actually the file storing the session data) available by keeping it sincronized beetween the Plan 9 fileservers? Hoping to have been clear... Thanks for your help Giacomo
Re: [9fans] FileServer grid
On Fri, 2009-02-06 at 23:26 +0100, Giacomo Tesio wrote: Hello every one... In a context of really heavy load and high availability needs, I'm evaluating plan 9 to implement a fileserver grid to be used by a web server for temporary storage (session's serializations, for example). What OS do you web servers run under? I'd like to build a Plan 9 grid exposing a unique filesystem mounted by all the web servers. Are you going to talk to this filesystem using 9P or something else? Each session could be accessible from any web server instantly, but what if a fileserver in the grid break? Is there a way to mantain such a session (actually the file storing the session data) available by keeping it sincronized beetween the Plan 9 fileservers? This is unclear. Please restate. Thanks, Roman.
Re: [9fans] FileServer grid
Hello every one... In a context of really heavy load and high availability needs, I'm evaluating plan 9 to implement a fileserver grid to be used by a web server for temporary storage (session's serializations, for example). I'd like to build a Plan 9 grid exposing a unique filesystem mounted by all the web servers. Each session could be accessible from any web server instantly, but what if a fileserver in the grid break? Is there a way to mantain such a session (actually the file storing the session data) available by keeping it sincronized beetween the Plan 9 fileservers? my 2ยข. before plan 9 got a shiny osi license, i did something like this on linux. since it was linux, the backend server took commands much like a scsi device does rather than use 9p. since there were no reasonable threading option in those days, it worked like a task-based operating system. we used select to schedule work. all state was written to disk so that the death of the server was not fatal. horrible, i know. but it worked reasonably well without declaring war on the system we needed to use. having two web servers would have been easy in this setup. having multiple back-end servers was not possible. but neither was ever a performance limitation for us so it remained unexplored. this is because all the work was pushed to a cluster of workers fronted by the backend server. they were always the limitation. at some level of throughput, this server would be a limitation. i would be suprised if the limitation would not be the speed of your network. since the amount of traffic this server sees should be much less than the amount of web traffic, one machine with a 10gbe card could move a lot of data. - erik
Re: [9fans] sed crash
On Thu, Feb 05, 2009 at 04:13:46PM -0500, erik quanstrom wrote: it would be much preferable to put the pgp stuff in its own mime part, as many mail readers do. X-Pgp-Agent: GPGMail d55 (v55, Leopard) X-Mailer: Apple Mail (2.930.3) and his mailer (plugin) can do so - if it is configured correctly.
[9fans] live cd
does anyone have handy the disk/mk9660 arguments used to create the plan 9 live cd? it seems that -9j is not quite right. - erik
Re: [9fans] live cd
On Fri, Feb 6, 2009 at 5:17 PM, erik quanstrom quans...@quanstro.net wrote: does anyone have handy the disk/mk9660 arguments used to create the plan 9 live cd? it seems that -9j is not quite right. /sys/lib/dist/mkfile russ
Re: [9fans] live cd
thanks, russ. i'm not sure why 9660srv without the -9 sorry. misfired. - erik
Re: [9fans] live cd
On Fri, Feb 6, 2009 at 5:17 PM, erik quanstrom quans...@quanstro.net wrote: does anyone have handy the disk/mk9660 arguments used to create the plan 9 live cd? it seems that -9j is not quite right. /sys/lib/dist/mkfile russ thanks, russ. i'm not sure why 9660srv without the -9 flag will lowercase all the files on a cd made with -9j and not -9cj. with the -9 flag, things aren't perfect, either, because the ':'s get dropped. are these bugs in 9660srv, or do i misunderstand the situation? (i do now realize that in any event the -c flag is preferable.) do you know if there is any other information on devsd than the manual pages? in writing up the ata raw command stuff, i realized that there are some small differences between the manual pages and how it is actually used. the raw file is documented as taking raw commands for the device, but in practice they have been scsi cdbs. combined sas/sata controllers kind of beg that question. hope that stuff didn't make you want to gouge your eyes out. - erik
[9fans] troff clock hack
i saw a clock face that looked something like
this some time ago. but in the original a few
of the places were out of form and for some
reason, i had to fix it.
build with
eval `{doctype clock.ms}|clock.ps lp -m.9 -dstdout
it took impressively little code and , due to
the wonders of pic and eqn.
it would be neat to have a companion for
mclock, but i couldn't think of a way to
scale the clock without the projecting becoming
more trouble than it's worth.
- erik
clock.ms
Description: Troff MS-macros document
[9fans] /net different from sockets, but better?
I am planning on porting the /net concept of Plan9 to Linux. My Plan: Use libfs[1] to write a synthetic filesystem in Linux, much like securityfs[2], or /proc. This libfs based code will make calls to the TCP/IP stack on the linux, and basically be an alternative to the Linux kernel sockets. As a result I will expose networking using /net, instead of POSIX to the applications. My Motivation: Glendix[3] My Question: I know that using /net instead of sockets is very different. But is it better? Specially from the networking side of things, not from application development point of view (which we have already established is simpler, by example). [1] http://lwn.net/Articles/57369/ [2] http://lwn.net/Articles/153366/ [3] http://glendix.org/ and http://glendix.org/glendix_iwp9_2008.pdf andhttp://www.osnews.com/story/20588/ Regards, -- Rahul Murmuria
[9fans] External HDD over USB
This is a Seagate FreeAgent. term% usb/disk usb/disk: initialisation: permission denied usb/disk: statuscmd: fd out of range or not open usb/disk: statuscmd: fd out of range or not open usb/disk: statuscmd: fd out of range or not open usbscsi: write cmd: fd out of range or not open usb/disk: statuscmd: fd out of range or not open usb/disk: statuscmd: fd out of range or not open usb/disk: statuscmd: fd out of range or not open status 0xFFFD usb/disk: initialisation: fd out of range or not open usb/disk: no usb mass storage device found Suggestions? ak
Re: [9fans] External HDD over USB
On Fri Feb 6 23:08:59 EST 2009, aku...@mail.nanosouffle.net wrote: This is a Seagate FreeAgent. term% usb/disk usb/disk: initialisation: permission denied usb/disk: statuscmd: fd out of range or not open usb/disk: statuscmd: fd out of range or not open usb/disk: statuscmd: fd out of range or not open usbscsi: write cmd: fd out of range or not open usb/disk: statuscmd: fd out of range or not open usb/disk: statuscmd: fd out of range or not open usb/disk: statuscmd: fd out of range or not open status 0xFFFD usb/disk: initialisation: fd out of range or not open usb/disk: no usb mass storage device found it's a little hard to be certain because usb/disk does not do werrstr() before it calls umsinit, but, i'd bet you're actually having permission problems. are you running usb/disk as the host owner (eve)? - erik
Re: [9fans] External HDD over USB
I've tried running it as glenda and another user I've created. Same results. On 06/02/2009, erik quanstrom quans...@quanstro.net wrote: On Fri Feb 6 23:08:59 EST 2009, aku...@mail.nanosouffle.net wrote: This is a Seagate FreeAgent. term% usb/disk usb/disk: initialisation: permission denied usb/disk: statuscmd: fd out of range or not open usb/disk: statuscmd: fd out of range or not open usb/disk: statuscmd: fd out of range or not open usbscsi: write cmd: fd out of range or not open usb/disk: statuscmd: fd out of range or not open usb/disk: statuscmd: fd out of range or not open usb/disk: statuscmd: fd out of range or not open status 0xFFFD usb/disk: initialisation: fd out of range or not open usb/disk: no usb mass storage device found it's a little hard to be certain because usb/disk does not do werrstr() before it calls umsinit, but, i'd bet you're actually having permission problems. are you running usb/disk as the host owner (eve)? - erik
