From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS, HTML_MESSAGE,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.4 Received: from tb-ob0.topicbox.com (tb-ob0.topicbox.com [64.147.108.117]) by inbox.vuxu.org (Postfix) with ESMTP id 29E0620232 for ; Thu, 1 Aug 2024 22:32:12 +0200 (CEST) Received: from tb-mx1.topicbox.com (tb-mx1.nyi.icgroup.com [10.90.30.61]) by tb-ob0.topicbox.com (Postfix) with ESMTP id 5C5042146F for ; Thu, 1 Aug 2024 16:32:11 -0400 (EDT) (envelope-from bounce.mM01f451723e39ea2e8491cf32.r522be890-2105-11eb-b15e-8d699134e1fa@9fans.bounce.topicbox.com) Received: by tb-mx1.topicbox.com (Postfix, from userid 1132) id 565C41EB223E; Thu, 1 Aug 2024 16:32:11 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed; d=9fans.net; h=from:to :subject:message-id:references:in-reply-to:date:mime-version :content-type:content-transfer-encoding:list-help:list-id :list-post:list-subscribe:reply-to:list-unsubscribe; s=dkim-1; t=1722544331; x=1722630731; bh=Zskl2JaK4sMQWA8bdX9DHPkAT/7tnD+o ShGMzsCFYHU=; b=JlQSyVbZgAWfLDbF7hpTfajp0FSrnVvCZHYApsrj7+WAEe24 IXpT3H3fgYaNgKD+o/d3cXJMumm8A964ySFygUkgWp3F7eSVST+z2B/YEUEuY5H2 wzPL1sqxVT1rCiQ36M5FFXbrcp2SQSJMPYIuGfTb0IiqTIw2uxWF4D76k18= From: kalona.ayeliski@fastmail.us To: 9fans <9fans@9fans.net> Subject: Re: [9fans] Re: venti/mirrorarenas usage Message-Id: <17225443240.06C3.977408@composer.9fans.topicbox.com> References: <17225395880.e3ed2A9b7.56557@composer.9fans.topicbox.com> In-Reply-To: Date: Thu, 1 Aug 2024 16:32:04 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary=17225443241.b75233B.977408 Content-Transfer-Encoding: 7bit Topicbox-Policy-Reasoning: allow: sender is a member Topicbox-Message-UUID: 1dbbbbf8-5045-11ef-b772-c256242d11b0 Archived-At: =?UTF-8?B?PGh0dHBzOi8vOWZhbnMudG9waWNib3guY29tL2dyb3Vwcy85?= =?UTF-8?B?ZmFucy9UY2EwZWIwZmJiMjQwNGUzMS1NMDFmNDUxNzIzZTM5ZWEyZTg0OTFj?= =?UTF-8?B?ZjMyPg==?= List-Help: List-Id: "9fans" <9fans.9fans.net> List-Post: List-Software: Topicbox v0 List-Subscribe: Precedence: list Reply-To: 9fans <9fans@9fans.net> List-Unsubscribe: , Topicbox-Delivery-ID: 2:9fans:437d30aa-c441-11e9-8a57-d036212d11b0:522be890-2105-11eb-b15e-8d699134e1fa:M01f451723e39ea2e8491cf32:1:xRbek2f-tqm8H7aMn6cfhzOiQWbkIm_Y1AKRoav2LVo --17225443241.b75233B.977408 Date: Thu, 1 Aug 2024 16:32:04 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Here is another attempt at an answer based on found information. Added alte= rnatives for additional context. Ensuring Data Redundancy in Plan 9: Using `venti/mirrorarenas` Introduction Plan 9 from Bell Labs uses innovative methods for distributed computing. Ve= nti, a key component, offers content-addressable storage. Ensuring redundan= cy for Venti archives is vital. This guide explains how to set up `venti/mi= rrorarenas` to mirror arenas automatically and why it is preferred over `fs= (3)` mirror. Setting Up `venti/mirrorarenas` for Automatic Mirroring 1. Configure the Second Venti Server: Set up a second Venti server as described in the `venti(8)` manual page. If= both servers run on the same machine, ensure they use different port numbe= rs. 2. Create a Configuration File: Create a configuration file (`/sys/lib/venti/mirrorconf`) specifying the so= urce and destination arenas: =C2=A0=C2=A0 =C2=A0=C2=A0 index main =C2=A0=C2=A0 isect /dev/sdN0/index =C2=A0=C2=A0 arenas /dev/sdN0/arenas /dev/sdM0/arenas-mirror 3. Format the Index and Arenas: Format the primary and mirrored arenas: =C2=A0=C2=A0 =C2=A0=C2=A0 venti/fmtisect isect0 /dev/sdN0/index =C2=A0=C2=A0 venti/fmtarenas -a 512M /dev/sdN0/arenas =C2=A0=C2=A0 venti/fmtarenas -a 512M /dev/sdM0/arenas-mirror 4. Start the Venti Server: =C2=A0=C2=A0 Initialize and start the Venti server with the configuration f= ile: =C2=A0 =C2=A0=C2=A0 venti -c /sys/lib/venti/mirrorconf =C2=A0 5. Run `venti/mirrorarenas`: =C2=A0=C2=A0 Use `venti/mirrorarenas` to start the mirroring process: =C2=A0=C2=A0 =C2=A0=C2=A0 venti/mirrorarenas -c /sys/lib/venti/mirrorconf Advantages of `venti/mirrorarenas` - Speed: `venti/mirrorarenas` is fast and includes checks to ensure the are= na geometries match. - Fault Tolerance: Ensures data availability by mirroring data in real-time= across multiple storage devices. - Automation: Once set up, it continuously mirrors data with minimal admini= strative intervention. Alternative Methods for Mirroring Venti Servers 1. Using `venti-copy`: =C2=A0=C2=A0 - Purpose: Copies blocks from one Venti server to another. =C2=A0=C2=A0 - Usage: =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 cat scores.txt | while read score ; do venti-copy = $venti1 $venti2 $score ; done =C2=A0=C2=A0=C2=A0=C2=A0 2. Using `venti-rdarena` and `venti-wrarena`:** =C2=A0=C2=A0 - Purpose: Reads and writes arenas one by one. =C2=A0=C2=A0 - Usage: =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 venti-rdarena /dev/sdN0/arenas | venti-wrarena /de= v/sdM0/arenas-mirror =C2=A0=C2=A0=C2=A0=C2=A0 3. Manual Copy Using `dd`: =C2=A0=C2=A0 - Purpose: Manually copies arenas using `dd`. =C2=A0=C2=A0 - Usage: =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 for i in $(seq $start $end); do =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 echo "Copying arena $i..." =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 skip=3D$(( 97 + $i * 65536 )) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 dd if=3D"$orig" bs=3D8192 skip=3D$skip= count=3D65536 seek=3D$skip of=3D"$dest" =C2=A0=C2=A0=C2=A0=C2=A0 done =C2=A0=C2=A0=C2=A0=C2=A0 Building Arenas Post-Mirroring After copying or mirroring arenas, the destination server must recognize th= e new data structure: =C2=A0 venti-buildarenas -c /sys/lib/venti/mirrorconf Comparison with `fs(3)` Mirroring - Scope: =C2=A0 - `venti/mirrorarenas` is specialized for Venti archives, handling c= ontent-addressable storage efficiently. =C2=A0 - `fs(3)` mirror is a general-purpose tool for mirroring entire file= systems. - Configuration Complexity: =C2=A0 - `venti/mirrorarenas` requires specific Venti configuration, ensuri= ng precise data handling. =C2=A0 - `fs(3)` mirror is simpler but not optimized for Venti=E2=80=99s un= ique storage model. - Performance: =C2=A0 - `venti/mirrorarenas` is optimized for Venti=E2=80=99s needs, provi= ding faster and more reliable redundancy. =C2=A0 - `fs(3)` mirror might introduce more overhead due to its broader fu= nctionality. Conclusion Using `venti/mirrorarenas` for Venti-specific redundancy offers a tailored,= efficient solution. It automates the mirroring process, ensuring continuou= s data protection. Compared to `fs(3)` mirror, it provides a more specializ= ed approach, optimized for Venti=E2=80=99s content-addressable storage. Thi= s choice ensures data resilience in Plan 9 systems, safeguarding against ha= rdware failures. For broader filesystem redundancy, `fs(3)` mirror remains = a versatile option, but for Venti archives, `venti/mirrorarenas` is the pre= ferred tool. Reference For more details, see [How to mirror one Venti to another](https://www.cesp= edes.org/blog/tag=3D69). Copyright 2024 by Kalona Ayeliski. All rights reserved. ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/Tca0eb0fbb2404e31-M01f45= 1723e39ea2e8491cf32 Delivery options: https://9fans.topicbox.com/groups/9fans/subscription --17225443241.b75233B.977408 Date: Thu, 1 Aug 2024 16:32:04 -0400 MIME-Version: 1.0 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Here is another attempt at an answer based on = found information. Added alternatives for additional context.


Ensuring Data Redundancy in Plan 9: Using `venti/m= irrorarenas`

Introduction

Plan 9 from Bell Labs uses innovative methods for di= stributed computing. Venti, a key component, offers content-addressable sto= rage. Ensuring redundancy for Venti archives is vital. This guide explains = how to set up `venti/mirrorarenas` to mirror arenas automatically and why i= t is preferred over `fs(3)` mirror.

Settin= g Up `venti/mirrorarenas` for Automatic Mirroring

1. Configure the Second Venti Server:
Set up a seco= nd Venti server as described in the `venti(8)` manual page. If both servers= run on the same machine, ensure they use different port numbers.

2. Create a Configuration File:
Cre= ate a configuration file (`/sys/lib/venti/mirrorconf`) specifying the sourc= e and destination arenas:
  
&nbs= p;  index main
   isect /dev/sdN0/index
   arenas /dev/sdN0/arenas /dev/sdM0/arenas-mirror

3. Format the Index and Arenas:
<= div>Format the primary and mirrored arenas:
  
   venti/fmtisect isect0 /dev/sdN0/index
   venti/fmtarenas -a 512M /dev/sdN0/arenas
   venti/fmtarenas -a 512M /dev/sdM0/arenas-mirror

4. Start the Venti Server:
  = Initialize and start the Venti server with the configuration file:
 
   venti -c /sys/lib/venti/mirror= conf
 
5. Run `venti/mirrorarenas`:
   Use `venti/mirrorarenas` to start the mirroring = process:
  
   venti/mi= rrorarenas -c /sys/lib/venti/mirrorconf

Ad= vantages of `venti/mirrorarenas`

- Speed: = `venti/mirrorarenas` is fast and includes checks to ensure the arena geomet= ries match.
- Fault Tolerance: Ensures data availability by= mirroring data in real-time across multiple storage devices.
- Automation: Once set up, it continuously mirrors data with minimal adm= inistrative intervention.

Alternative Meth= ods for Mirroring Venti Servers

1. Using `= venti-copy`:
   - Purpose: Copies blocks from one= Venti server to another.
   - Usage:
=
    
     cat = scores.txt | while read score ; do venti-copy $venti1 $venti2 $score ; done=
    
2. Using `venti-r= darena` and `venti-wrarena`:**
   - Purpose: Read= s and writes arenas one by one.
   - Usage:
=
    
    = ; venti-rdarena /dev/sdN0/arenas | venti-wrarena /dev/sdM0/arenas-mirror
    
3. Manual Copy Using= `dd`:
   - Purpose: Manually copies arenas using= `dd`.
   - Usage:
  &n= bsp; 
     for i in $(seq $start $= end); do
       echo "Co= pying arena $i..."
      = ; skip=3D$(( 97 + $i * 65536 ))
    &nb= sp;  dd if=3D"$orig" bs=3D8192 skip=3D$skip count=3D65536 se= ek=3D$skip of=3D"$dest"
     = done
    

Buildin= g Arenas Post-Mirroring

After copying or m= irroring arenas, the destination server must recognize the new data structu= re:

  venti-buildarenas -c /sys/lib/v= enti/mirrorconf


Comparison with `fs(= 3)` Mirroring

- Scope:
&nb= sp; - `venti/mirrorarenas` is specialized for Venti archives, handling cont= ent-addressable storage efficiently.
  - `fs(3)` mirro= r is a general-purpose tool for mirroring entire filesystems.
- Configuration Complexity:
  - `venti/mirrorarenas= ` requires specific Venti configuration, ensuring precise data handling.
  - `fs(3)` mirror is simpler but not optimized for Vent= i’s unique storage model.
- Performance:
<= div>  - `venti/mirrorarenas` is optimized for Venti’s needs, pro= viding faster and more reliable redundancy.
  - `fs(3)= ` mirror might introduce more overhead due to its broader functionality.

Conclusion

= Using `venti/mirrorarenas` for Venti-specific redundancy offers a tailored,= efficient solution. It automates the mirroring process, ensuring continuou= s data protection. Compared to `fs(3)` mirror, it provides a more specializ= ed approach, optimized for Venti’s content-addressable storage. This = choice ensures data resilience in Plan 9 systems, safeguarding against hard= ware failures. For broader filesystem redundancy, `fs(3)` mirror remains a = versatile option, but for Venti archives, `venti/mirrorarenas` is the prefe= rred tool.

Reference

For more details, see [How to mirror one Venti to another](https://www.cespedes.org/blo= g/tag=3D69).

Copyright 2024 by Kalona = Ayeliski. All rights reserved.
= --17225443241.b75233B.977408--