Re: [9fans] Plan 9 server controls impaired and steps taken before

Re: [9fans] Plan 9 server controls impaired and steps taken before

[YAMANASHI Takeshi]

hi,

> I am not sure, but I am on Day 4 of the initial snap. I'm not sure how
> long I need to wait until I consider the current installation process
> a failure. Perhaps 12 more days of waiting and I'll call it quits.

My idea of working around this is taking the initial "snap -a" during
the installation.  I'm assuming you are installing from CD on sdD0 to
sdC0 with the default partition names.

1: finish the installation to where "Feel free to turn off your computer."
   message shows.

2: sweep a new window and follow the steps below.
	term% mount /srv/9660 /n/dist /dev/sdD0/data
	term% cd /n/dist/386/bin
	term% {echo srv -p fscons; ./fossil/conf /dev/sdC0/fossil} > /tmp/f
	term% ./venti/venti -c /dev/sdD0/arenas -a 'tcp!127.1!17034' -h 'tcp!127.1!8888'
	term% venti=tcp!127.1!17034
	term% ./fossil/fossil -c '. /tmp/f'
	term% ./con -l /srv/fscons
	prompt: fsys main snap -a
	  __wait until archive:.... shows__
	prompt: fsys all sync
	prompt: fsys all halt
	  __quits con__
	 >>>q
	term% kill fossil | rc
	term% ./fossil/fossil -c '. /tmp/f'
	term% ./con -l /srv/fscons
	prompt: fsys main df
	  __ the usage should be low once archived to venti __
	prompt: fsys all sync
	prompt: fsys all halt
	  __ quit con __
	term% kill fossil | rc
	term% ./venti/sync

	<important>
	DON'T HIT delete key IN THIS WINDOW.   IT WILL KILL venti.
	</important>

3: you can check the progress of snapshoting in another window.
	term% mount /srv/9660 /n/dist /dev/sdD0/data
	term% cd /n/dist/386/bin
	term% telnet tcp!127.1!8888
	GET /storage
	  __venti usages shows__

This process could be migrated into the installation process or not.
-- 

Re: [9fans] Plan 9 server controls impaired and steps taken before

[Richard Miller]

> 	<important>
> 	DON'T HIT delete key IN THIS WINDOW.   IT WILL KILL venti.
> 	</important>

Venti remains interruptible even when running in the background -
bug or feature?  If it's a bug, I reckon this is the fix:

===============
/sys/src/cmd/venti/venti.c:80,85 - venti.c:80,88
  	if(config == nil)
  		config = "venti.conf";
  
> 	if(background)
> 		rfork(RFNOTEG);
> 
  	vtAttach();
  
  	if(!initArenaSum())
===============

-- Richard

Re: [9fans] Plan 9 server controls impaired and steps taken before

[Russ Cox]

> > There is a window (I think ten seconds) between snap -a
> > and fossil deciding to start archiving.  If you access any
> > file in those ten seconds then enough of the root gets
> > copied-on-write that you shouldn't see the deadlock at all.
> >
> 
> What happens if some accesses come from Internet during that time ?
> Files in /sys/log/* are big enough.
> Sorry I couldn't understand "the root".

The root of the tree of files and blocks.  It's copy-on-write
after a snapshot but snap -a locks the blocks while it is
archiving.  If the block has already been copied, no big deal.
If it's still the one in the file tree (not been copied-on-write yet)
then you can't access it until the archiver finishes.  I should
fix this to be some sort of read lock but it's not completely
straightforward.

Russ

Re: [9fans] Plan 9 server controls impaired and steps taken before

[arisawa]

Hello Russ,

> There is a window (I think ten seconds) between snap -a
> and fossil deciding to start archiving.  If you access any
> file in those ten seconds then enough of the root gets
> copied-on-write that you shouldn't see the deadlock at all.
>

What happens if some accesses come from Internet during that time ?
Files in /sys/log/* are big enough.
Sorry I couldn't understand "the root".

Kenji Arisawa

Re: [9fans] Plan 9 server controls impaired and steps taken before

[Russ Cox]

I'd be frustrated too.  I've never seen a wait that long.
I made a bad design choice in the locking of fossil blocks
and I apologize.  My suggestion would be to run sync
and then halt at the console, reboot, and let it start
again.  

There is a window (I think ten seconds) between snap -a
and fossil deciding to start archiving.  If you access any
file in those ten seconds then enough of the root gets
copied-on-write that you shouldn't see the deadlock at all.
Rebooting should cause enough file activity at startup
to get around the deadlock.

Russ

Re: [9fans] Plan 9 server controls impaired and steps taken before

[Vester Thacker]

On 5/14/05, arisawa@ar.aichi-u.ac.jp <arisawa@ar.aichi-u.ac.jp> wrote:
> 
> It seems fossil (at least in Jan. and Feb. of this year) locked the
> file service during "snap" and "snap -a".
> Does this continue?

I am not sure, but I am on Day 4 of the initial snap. I'm not sure how
long I need to wait until I consider the current installation process
a failure. Perhaps 12 more days of waiting and I'll call it quits.

Btw I have a 40 GB fossil and a 210GB venti running on an AMD64
machine. There is approximately 300 Mb of files on the fossil.  I have
dma turned on. My hard disk is an ATA 133 w/ 16Mb of cache. I don't
understand *why* it takes so long for a snap to complete.

Sorry if I come off as appearing frustrated about the wait, but I am
*frustrated* about this.
This isn't something you can recommend your friends to try; or even
present to a crowd during an Expo.

-vester

Re: [9fans] Plan 9 server controls impaired and steps taken before

[arisawa]

Hello,

> Kenji Arisawa sent me a pccpuf config that has worked well for him and
> that I plan to use.
>

That depends on kernel codes.

It seems fossil (at least in Jan. and Feb. of this year) locked the 
file service during "snap" and "snap -a".
Does this continue?

Kenji Arisawa

Re: [9fans] Plan 9 server controls impaired and steps taken before

[Russ Cox]

> Kenji Arisawa sent me a pccpuf config that has worked well for him and
> that I plan to use.
> Should anyone be following this thread and anticipates using the
> fossil+venti option during an install, this should help. Thanks go to
> Kenji Arisawa for the following config:

Unless you're using a laptop as your cpu server,
this config won't work any differently from the standard 9pccpuf.
It's the standard one with some laptop ethernet drivers added.

Russ

Re: [9fans] Plan 9 server controls impaired and steps taken before

[Vester Thacker]

On 5/11/05, andrey mirtchovski <mirtchov@cpsc.ucalgary.ca> wrote:
> > dma may be your friend.  it makes things 100 times quicker on fast machines.
> >
> > brucee
> 
> my experiences are definitely with dma on :)

If I take that literally, then I can expect my a working machine
within 200 days with dma turned off. ;)

Thanks for the suggestion, Brucee, I'll turn dma on. I'll add it to
the installation guide.
Andrey, thanks for your help too.

Kenji Arisawa sent me a pccpuf config that has worked well for him and
that I plan to use.
Should anyone be following this thread and anticipates using the
fossil+venti option during an install, this should help. Thanks go to
Kenji Arisawa for the following config:

The configuration(/sys/src/9/pc/pccpuf) is as following:

dev
        root
        cons
        arch
        pnp             pci
        env
        pipe
        proc
        mnt
        srv
        dup
        rtc
        ssl
        tls
        bridge          log
        sdp             thwack unthwack
        cap
        kprof
        fs

        ether           netif
        ip              arp chandial ip ipv6 ipaux iproute netlog
nullmedium pktmedium ptclbsum386 inferno

        draw            screen vga vgax
        mouse           mouse
        vga

        sd
        floppy          dma

        uart
        usb

link
        ether2000       ether8390
        ether2114x      pci
        ether79c970     pci
        ether8003       ether8390
        ether8139       pci
        ether82543gc    pci
        ether82557      pci
        ether83815      pci
        etherelnk3      pci
        etherga620      pci
        etherigbe       pci ethermii
        etherrhine      pci ethermii
        ethersink
        ethermedium
        netdevmedium
        loopbackmedium
        usbuhci

misc
        archmp          mp apic

        uarti8250
        uartpci         pci

        sdata           pci sdscsi
        sd53c8xx        pci sdscsi

        vga3dfx         +cur
        vgaark2000pv    +cur
        vgabt485        =cur
        vgaclgd542x     +cur
        vgaclgd546x     +cur
        vgact65545      +cur
        vgacyber938x    +cur
        vgaet4000       +cur
        vgahiqvideo     +cur
        vgai81x +cur
        vgamach64xx     +cur
        vgamga2164w     +cur
        vgamga4xx       +cur
        vganeomagic     +cur
        vganvidia       +cur
        vgargb524       =cur
        vgas3           +cur vgasavage
        vgat2r4         +cur
        vgatvp3020      =cur
        vgatvp3026      =cur
        vgavmware       +cur

ip
        il
        tcp
        udp
        ipifc
        icmp
        icmp6
        gre
        ipmux
        esp
        rudp

port
        int cpuserver = 1;

boot cpu boot #S/sdC0/
        tcp
        il
        local

bootdir
        bootpccpuf.out boot
        /386/bin/ip/ipconfig
        /386/bin/auth/factotum
        /386/bin/disk/kfs
        /386/bin/fossil/fossil
        /386/bin/venti/venti

--

-vester

Re: [9fans] Plan 9 server controls impaired and steps taken before

[andrey mirtchovski]

> dma may be your friend.  it makes things 100 times quicker on fast machines.
> 
> brucee

my experiences are definitely with dma on :)