[9fans] venti on linux under p9port?

[9fans] venti on linux under p9port?

[Adrian Tritschler]

I'm trying to muddle my way through creating a venti under p9ports on a
linux box (for various reasons).  For the moment, I'm not too concerned
at performance, I just want to get familiar with it.  Rather than
accessing a raw partition, I'm trying to set it up to refer to arena and
index files in /usr/local/venti (is this sensible?)

So far:

Created the arena files from sh with:

dd if=/dev/zero of=arenas1 seek=$((1024 * 1024 * 512 - 1)) bs=1 count=1

Created the index files with:

dd if=/dev/zero of=isect0 seek=$((1024 * 1024 * 24 - 1)) bs=1 count=1

Then following the wiki page on setting up venti:

Format the arenas with:

% venti/fmtarenas arenas0 /usr/local/venti/arenas0
fmtarenas /usr/local/venti/arenas0: 1 arenas, 536,076,288 bytes storage,
524,288 bytes for index map

% venti/fmtarenas arenas1 /usr/local/venti/arenas1
fmtarenas /usr/local/venti/arenas1: 1 arenas, 536,076,288 bytes storage,
524,288 bytes for index map

Format the index sections with:

% venti/fmtisect isect0 /usr/local/venti/isect0
fmtisect /usr/local/venti/isect0: 2,975 buckets of 215 entries, 524,288
bytes for index map
% venti/fmtisect isect1 /usr/local/venti/isect1
fmtisect /usr/local/venti/isect1: 2,975 buckets of 215 entries, 524,288
bytes for index map

% cat venti.conf
  # the name of the index
  index main

  # the index sections
  isect /usr/local/venti/isect0
  isect /usr/local/venti/isect1

  # the arenas
  arenas /usr/local/venti/arenas0
  arenas /usr/local/venti/arenas1

Problem comes when I try to start venti, it just gives me the following:

% venti/venti -w
usage: venti [-dsw] [-a ventiaddress] [-h httpaddress] [-c config] [-C
cachesize] [-I icachesize] [-B blockcachesize]

I can't seem to work out any combination of parameters that give any
output other than the above.

Any assistance, or which fine manual have i missed?

thanks,

	ADrian

---------------------------------------------------------------
Adrian Tritschler                          mailto:ajft@ajft.org
Latitude 38°S, Longitude 145°E, Altitude 50m,      Shoe size 44
---------------------------------------------------------------

Re: [9fans] venti on linux under p9port?

[Russ Cox]

> % venti/venti -w
> usage: venti [-dsw] [-a ventiaddress] [-h httpaddress] [-c config] [-C
> cachesize] [-I icachesize] [-B blockcachesize]
>
> I can't seem to work out any combination of parameters that give any
> output other than the above.

Looks like I lost -w.  Use "queuewrites" in the config instead.
No arguments at all -- venti/venti -- should work just fine.
Worst case, you could always look at the source code.
Venti is still somewhat in progress.  Sorry.

Russ

Re: [9fans] venti on linux under p9port?

[Adrian Tritschler]

Russ Cox wrote:
>>% venti/venti -w
>>usage: venti [-dsw] [-a ventiaddress] [-h httpaddress] [-c config] [-C
>>cachesize] [-I icachesize] [-B blockcachesize]
>>
>>I can't seem to work out any combination of parameters that give any
>>output other than the above.

> Looks like I lost -w.  Use "queuewrites" in the config instead.
> No arguments at all -- venti/venti -- should work just fine.
> Worst case, you could always look at the source code.
> Venti is still somewhat in progress.  Sorry.

Many thanks.

I think I had an additional problem in that the linux system had been
updated since last I compiled p9ports.  Redoing ./INSTALL and running
venti with no options works now.  Unfortunately, at the time of day that
I asked the question my mind was in no condition to look at the source code.

> Russ
	Adrian

---------------------------------------------------------------
Adrian Tritschler                          mailto:ajft@ajft.org
Latitude 38°S, Longitude 145°E, Altitude 50m,      Shoe size 44
---------------------------------------------------------------

Re: [9fans] venti on linux under p9port?

[Russ Cox]

> but when i try to use vbackup from my laptop, i run into problems:
>
> *** glibc detected *** double free or corruption (fasttop): 0x08083978 ***
> 11425: signal: sys: abort

make sure you have the latest source.
what is STACK set to in src/cmd/vbackup.c?
i upped it from 8192 to 32768 to solve some
problems others were having.  i don't know
why it was overflowing.

russ

Re: [9fans] venti on linux under p9port?

[jpc]

> 
> Many thanks.
> 
> I think I had an additional problem in that the linux system had been
> updated since last I compiled p9ports.  Redoing ./INSTALL and running
> venti with no options works now.  Unfortunately, at the time of day that
> I asked the question my mind was in no condition to look at the source code.
> 

did you get vbackup working?  i think i have venti running on a server:

% hget http://lepton5/storage
index=main
total arenas=19 active=1
total space=9,999,253,504 used=13,628,050
clumps=3,466 compressed clumps=2,802 data=23,379,423 compressed data=13,409,692
% 

but when i try to use vbackup from my laptop, i run into problems:

% echo $venti
tcp!lepton5!venti
% vbackup /dev/hda5
offset of magic: 1372
ffs magic 0xbe800ea0
offset of magic: 1372
ffs magic 0x0
offset of magic: 1372
ffs magic 0x0
*** glibc detected *** double free or corruption (fasttop): 0x08083978 ***
11425: signal: sys: abort
% core
stack ./core
	# Thu Sep 29 11:14:31 EDT 2005
	# vbackup /dev/hda5 
% stack ./core
gsignal()  called from abort+0xeb 
abort()  called from 0xb7e88365 
0xb7e88365  called from 0xb7e8ea07 
0xb7e8ea07  called from __libc_free+0x82 
__libc_free()  called from p9free+0x21 
p9free(v=0x8083978) /usr/local/plan9/src/lib9/malloc.c:32 called from ffssync+0xbc 
ffssync(fsys=0x80838e0) /usr/local/plan9/src/libdiskfs/ffs.c:175 called from fsysopenffs+0x7b 
fsysopenffs(disk=0x8078328) /usr/local/plan9/src/libdiskfs/ffs.c:51 called from fsysopen+0x16 
fsysopen(disk=0x8078328) /usr/local/plan9/src/libdiskfs/fsys.c:25 called from threadmain+0xf0 
threadmain(argc=0x2, argv=0xbf8c0b64) /usr/local/plan9/src/cmd/vbackup/vbackup.c:150 called from threadmainstart+0x24 
threadmainstart(v=0x0) /usr/local/plan9/src/libthread/thread.c:582 called from threadstart+0x16 
threadstart(y=0xb7de5008, x=0x0) /usr/local/plan9/src/libthread/thread.c:91 called from makecontext+0x44 
% 

i'm sure i'm doing something obviously wrong, but i'm having trouble
seein' it, can anyone else?

john cummings
cummij@rpi.edu