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From: Alviro Iskandar Setiawan <alviro.iskandar@gnuweeb.org>
Date: Thu, 28 Mar 2024 04:44:05 +0700
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Subject: Re: [## 346553 ##] Permohonan Backup NEO Lite
To: Ammar Faizi <ammarfaizi2@gnuweeb.org>
Cc: Rico Dwi Setiawan <support@biznetgio.com>, Yusuf Hadiwinata <yusuf@biznetgio.com>, 
	Aldy Prastyo <dipras@gnuweeb.org>, Michael William Jonathan <moe@gnuweeb.org>, 
	Matthew Patrick <thephoenix576@gnuweeb.org>, "GNU/Weeb Mailing List" <gwml@vger.gnuweeb.org>
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On Thu, Mar 28, 2024 at 4:36=E2=80=AFAM Ammar Faizi wrote:
> On Thu, Mar 28, 2024 at 4:27=E2=80=AFAM Alviro Iskandar Setiawan wrote:
> > Wew, lumayan ribet juga urusannya sampe pake kernel module. Emang
> > lebih reliable langsung ambil snapshot VM nya, semua disk tambahan
> > diduplicate di tempat lain gitu, ngga depend sama kernel yg jalan
> > wkwkwk
>
> Yeah, better solution. Di DigitalOcean backupnya juga pakai snapshot
> gitu. Itu juga live, gak pernah ganggu service.
>
> Urusan konsistensi data saya gak mendalami detailnya, tapi kemarin
> ngobrol di LK ada metode snapshot yang pakai temporary area dulu kalau
> call write ke disk di posisi backup, nanti readnya juga dari temporary
> itu baru setelah backup selesai dirty writenya di flush ke disk
> aslinya. Jadi hasilnya tetep konsisten, nggak terclobber secara
> partial.

yea, setahu gw strateginya emang gitu, pas proses bikin snapshot tetep
bisa read/write. Untuk read pas proses backup itu tergantung filenya
udah dimark dirty apa belum (dirty =3D sudah diubah), kalau udah dirty
pagenya diambil dari yg belum diflush, kalau ga keep reading from
untouched page

Beautiful method, bisa konsisten utuh se-block device, ngga setengah
berubah wkwkwk

-- Viro