From: ching lu <lsching17@gmail.com>
To: Eric Wheeler <bcache@lists.ewheeler.net>
Cc: linux-bcache@vger.kernel.org
Subject: Re: writeback mode behaviour on proper shut down
Date: Wed, 27 Apr 2016 09:45:22 +0800 [thread overview]
Message-ID: <CACHiF8C0A+Gmr5xYCRhB+dm0zLu3iyYysuQXNYAVLOmDUix5hg@mail.gmail.com> (raw)
In-Reply-To: <alpine.LRH.2.11.1604261953230.21555@mx.ewheeler.net>
is there any command for forcing flushing cache or invalidate cache?
On Wed, Apr 27, 2016 at 3:57 AM, Eric Wheeler <bcache@lists.ewheeler.net> wrote:
> On Tue, 26 Apr 2016, ching lu wrote:
>
>> Hi all,
>>
>> if i have 1 SSD caching 1 HDD using bcache, the cache mode is writeback
>>
>> if the PC shutdown/unmount normally, will all dirty data in the cache
>> be flushed to backing device before poweroff?
>
> No, it will remain in the cache.
>
>> i am afraid that SSD lose data if left without power for a long time.
>> e.g. hoilday.
>
> Wouldn't your data be retained if you used the SSD alone? SSDs should be
> stable in a powered off state unless it is a bad device.
>
> There exist RAM-based disks that may be volatile, but that is unlikely to
> be your situation.
>
> --
> Eric Wheeler
>
>>
>> Thanks in advance,
>> C
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-bcache" in
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>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
next prev parent reply other threads:[~2016-04-27 1:45 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-26 9:26 writeback mode behaviour on proper shut down ching lu
2016-04-26 19:57 ` Eric Wheeler
2016-04-27 1:45 ` ching lu [this message]
2016-04-27 2:10 ` Eric Wheeler
2016-04-28 3:55 ` ching lu
2016-05-11 1:14 ` Eric Wheeler
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