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 2D7D126BD7 for ; Thu, 1 Aug 2024 12:49:46 +0200 (CEST) Received: from tb-mx0.topicbox.com (tb-mx0.nyi.icgroup.com [10.90.30.73]) by tb-ob0.topicbox.com (Postfix) with ESMTP id 18A4D1AE92 for ; Thu, 1 Aug 2024 06:49:46 -0400 (EDT) (envelope-from bounce.mM87f2f824fda2bdc4651c2e78.r522be890-2105-11eb-b15e-8d699134e1fa@9fans.bounce.topicbox.com) Received: by tb-mx0.topicbox.com (Postfix, from userid 1132) id 167C1205FB0D; Thu, 1 Aug 2024 06:49:46 -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=1722509385; x=1722595785; bh=Y/kgYi6XYC8ptzg20z/M7bcnBZmjmGI6 MFPaAZ6P97A=; b=nnutyGpeX8NjOk5ccIw4LaUKPybCGWPnNiMI4n8IBxiBFzkl S5ugHTwjWD+jab7LCNjvs93fiB/03M9rZniVkhf9v04Gtp7E741EerJ0e7AA/PNv Z0BkAxDHhT7pi7EmEZ0A3TQGFDHTB6DLwKw4OsjdOngg3Z+IZ0gwd+GmVok= From: kalona.ayeliski@fastmail.us To: 9fans <9fans@9fans.net> Subject: Re: [9fans] Re: venti/mirrorarenas usage Message-Id: <17225093800.45D12A4E.506849@composer.9fans.topicbox.com> References: <18390E0A-2AA3-47F5-A3D3-A2EE4F7B4AF6@germteig.com> <17223203170.653c8.250835@composer.9fans.topicbox.com> <17224719440.dBbbfDEfB.47136@composer.9fans.topicbox.com> <17225035740.f469F00.16110@composer.9fans.topicbox.com> In-Reply-To: <17225035740.f469F00.16110@composer.9fans.topicbox.com> Date: Thu, 1 Aug 2024 06:49:40 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary=17225093801.b88F85D.506849 Content-Transfer-Encoding: 7bit Topicbox-Policy-Reasoning: allow: sender is a member Topicbox-Message-UUID: c14a662c-4ff3-11ef-b9e8-c256242d11b0 Archived-At: =?UTF-8?B?PGh0dHBzOi8vOWZhbnMudG9waWNib3guY29tL2dyb3Vwcy85?= =?UTF-8?B?ZmFucy9UY2EwZWIwZmJiMjQwNGUzMS1NODdmMmY4MjRmZGEyYmRjNDY1MWMy?= =?UTF-8?B?ZTc4Pg==?= 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:M87f2f824fda2bdc4651c2e78:1:jZNCtH-D-DJ2EWbLrTWALdq9MEz6WeoVdddJxebvcqE --17225093801.b88F85D.506849 Date: Thu, 1 Aug 2024 06:49:40 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Thank you for your constructive comments and motivation. I reviewed venti(8= ), venti/fmtarenas(8), and venti/mirrorarenas(8) again.=20 I reviewed Marco's post once again,=20 "venti/mirrorarenas is undocumented, and I couldn't find any topic here, which goes into more detail. So I am curious how does it work,=20 how does one to set it up, so the arenas get mirrored automatically, and why do you use it instead of fs(3) mirror?" This might be closer to a correct answer for Marco. All mistakes are mine. Ensuring Data Redundancy in Plan 9: Using `venti/mirrorarenas` Introduction Plan 9 from Bell Labs is renowned for its innovative approach to resource m= anagement, featuring Venti as a crucial component for content-addressable s= torage. Ensuring data redundancy within Venti is critical for preventing da= ta loss. This essay provides a concise guide to configuring `venti/mirrorar= enas` for automatic mirroring of Venti arenas and compares it to `fs(3)` mi= rroring. Setting Up `venti/mirrorarenas` `venti/mirrorarenas` is designed to mirror Venti arenas, providing redundan= cy by copying data to multiple storage locations. 1. Prepare Configuration: Create a configuration file (`/sys/lib/venti/mirrorconf`): =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 2. Format the Arenas: Use `venti/fmtarenas` to format the primary and mirrored arenas: =C2=A0=C2=A0 =C2=A0=C2=A0 venti/fmtarenas -a 512M /dev/sdN0/arenas =C2=A0=C2=A0 venti/fmtarenas -a 512M /dev/sdM0/arenas-mirror 3. Initialize and Start Venti: Start the Venti server with the configuration: =C2=A0=C2=A0 =C2=A0=C2=A0 venti -c /sys/lib/venti/mirrorconf 4. Run `mirrorarenas`: Use `venti/mirrorarenas` to initiate the mirroring process: =C2=A0=C2=A0 =C2=A0=C2=A0 venti/mirrorarenas -c /sys/lib/venti/mirrorconf Advantages of `venti/mirrorarenas` - Fault Tolerance: By mirroring data across multiple arenas, it ensures dat= a availability in case of hardware failures. - Automation: Once set up, it continuously mirrors data with minimal admini= strative intervention. Comparison with `fs(3)` Mirroring - Scope: =C2=A0 - `venti/mirrorarenas` is tailored for Venti archives, ensuring effi= cient handling of content-addressable storage. =C2=A0 - `fs(3)` mirror is a general-purpose mirroring tool for entire file= systems. - Configuration Complexity: =C2=A0 - `venti/mirrorarenas` requires specific configuration for Venti are= nas. =C2=A0 - `fs(3)` mirror is easier to configure but less specialized. - Performance: =C2=A0 - `venti/mirrorarenas` is optimized for Venti=E2=80=99s unique stora= ge needs. =C2=A0 - `fs(3)` mirror might introduce more overhead due to its broader fu= nctionality. Conclusion Choosing between `venti/mirrorarenas` and `fs(3)` mirror depends on the spe= cific needs for data redundancy. `venti/mirrorarenas` offers a specialized = and optimized solution for Venti archives, ensuring real-time mirroring and= fault tolerance. In contrast, `fs(3)` mirror provides a broader mirroring = capability for entire filesystems. Employing the appropriate tool ensures d= ata resilience in Plan 9 systems, safeguarding against hardware failures. Copyright 2024 by Kalona Ayeliski. All rights reserved. ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/Tca0eb0fbb2404e31-M87f2f= 824fda2bdc4651c2e78 Delivery options: https://9fans.topicbox.com/groups/9fans/subscription --17225093801.b88F85D.506849 Date: Thu, 1 Aug 2024 06:49:40 -0400 MIME-Version: 1.0 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Thank you for your constructive comments and m= otivation. I reviewed venti(8), venti/fmtarenas(8), and venti/mirrorarenas(= 8) again.

I reviewed Marco's post once again, 
  "venti/mirrorarenas=
 is undocumented, and I couldn't find any topic here,
  which goes into more detail.

  So I am curious how does it work,=20
  how does one to set it up, so the arenas get mirrored automatically,
  and why do you use it instead of fs(3) mirror?"

This might be closer to a correct answer for Marco. All mistakes are =
mine.


Ensuring Data Redundancy in Plan 9: Using `venti/mir=
rorarenas`

Introduction
Plan 9 from Bell Labs is renowned for its innovative approac= h to resource management, featuring Venti as a crucial component for conten= t-addressable storage. Ensuring data redundancy within Venti is critical fo= r preventing data loss. This essay provides a concise guide to configuring = `venti/mirrorarenas` for automatic mirroring of Venti arenas and compares i= t to `fs(3)` mirroring.

Setting Up `venti/= mirrorarenas`

`venti/mirrorarenas` is desi= gned to mirror Venti arenas, providing redundancy by copying data to multip= le storage locations.

1. Prepare Configura= tion:
Create a configuration file (`/sys/lib/venti/mirrorco= nf`):
  
   index main<= br />
   isect /dev/sdN0/index
 &n= bsp; arenas /dev/sdN0/arenas /dev/sdM0/arenas-mirror

=
2. Format the Arenas:
Use `venti/fmtarenas` to f= ormat the primary and mirrored arenas:
  
   venti/fmtarenas -a 512M /dev/sdN0/arenas
<= div>   venti/fmtarenas -a 512M /dev/sdM0/arenas-mirror

3. Initialize and Start Venti:
Start= the Venti server with the configuration:
  
   venti -c /sys/lib/venti/mirrorconf

4. Run `mirrorarenas`:
Use `venti/mirrora= renas` to initiate the mirroring process:
  
   venti/mirrorarenas -c /sys/lib/venti/mirrorconf

Advantages of `venti/mirrorarenas`

- Fault Tolerance: By mirroring data across multipl= e arenas, it ensures data availability in case of hardware failures.
<= /div>
- Automation: Once set up, it continuously mirrors data with mini= mal administrative intervention.

Compariso= n with `fs(3)` Mirroring

- Scope:
  - `venti/mirrorarenas` is tailored for Venti archives, ensur= ing efficient handling of content-addressable storage.
&nbs= p; - `fs(3)` mirror is a general-purpose mirroring tool for entire filesyst= ems.

- Configuration Complexity:
  - `venti/mirrorarenas` requires specific configuration for Ve= nti arenas.
  - `fs(3)` mirror is easier to configure = but less specialized.

- Performance:
=
  - `venti/mirrorarenas` is optimized for Venti’s uni= que storage needs.
  - `fs(3)` mirror might introduce = more overhead due to its broader functionality.

Conclusion

Choosing between `venti/m= irrorarenas` and `fs(3)` mirror depends on the specific needs for data redu= ndancy. `venti/mirrorarenas` offers a specialized and optimized solution fo= r Venti archives, ensuring real-time mirroring and fault tolerance. In cont= rast, `fs(3)` mirror provides a broader mirroring capability for entire fil= esystems. Employing the appropriate tool ensures data resilience in Plan 9 = systems, safeguarding against hardware failures.


Copyright 2024 by Kalona Ayeliski. All rights reserved.
= --17225093801.b88F85D.506849--