[gpfsug-discuss] GPFS - pagepool data protection?

[Pavel Pokorny]

Hello,
thanks you for all the answers, It is more clear now.
Regards, Pavel

--
Ing. Pavel Pokorný
DATERA s.r.o. | Ovocný trh 580/2 | Praha | Czech Republic
www.datera.cz | Mobil: +420 602 357 194 | E-mail: pavel.pokorny at datera.cz


On Mon, Nov 17, 2014 at 1:00 PM, <gpfsug-discuss-request at gpfsug.org> wrote:

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>    1.  GPFS - pagepool data protection? (Sean S Lee)
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> Message: 1
> Date: Mon, 17 Nov 2014 17:49:39 +0800
> From: Sean S Lee <seanlee at tw.ibm.com>
> To: gpfsug-discuss at gpfsug.org
> Subject: [gpfsug-discuss]  GPFS - pagepool data protection?
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>
> Hi Pavel,
>
> Most popular filesystems work that way.
>
> Write buffering improves the performance at the expense of some risk.
> Today most applications and all modern OS correctly handle "crash
> consistency", meaning they can recover from uncommitted writes.
>
> If you have data which absolutely cannot tolerate any "in-flight" data
> loss, it requires significant planning and resources on multiple levels,
> but as far as GPFS is concerned you could create a small file system and
> data (VMDK's) or serve GPFS or cNFS (mount GPFS with "syncfs", mount NFS
> with sync,no_wdelay)  to VM clients from those filesystems.
> Your VM OS (VMDK) could be on a regular GPFS file system and your app data
> and logs could be on a small GPFS with synchronous writes.
>
> Regards
> Sean
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