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From: Goffredo Baroncelli <kreijack@inwind.it>
To: Thiago Ramon <thiagoramon@gmail.com>, Qu Wenruo <quwenruo.btrfs@gmx.com>
Cc: Johannes Thumshirn <Johannes.Thumshirn@wdc.com>,
	Qu Wenruo <wqu@suse.com>,
	"linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
Subject: Re: RAID56 discussion related to RST. (Was "Re: [RFC ONLY 0/8] btrfs: introduce raid-stripe-tree")
Date: Sun, 17 Jul 2022 19:58:12 +0200	[thread overview]
Message-ID: <7734292e-2ceb-cd4e-db54-2ab3629ff75e@inwind.it> (raw)
In-Reply-To: <d49eca7a-74be-c3a9-a70b-055e9e37bcc2@inwind.it>

On 16/07/2022 16.26, Goffredo Baroncelli wrote:
> On 16/07/2022 15.52, Thiago Ramon wrote:
>>> Good luck implementing that feature just for RAID56 on non-zoned devices.
>> DIO definitely would be a problem this way. As you mention, a separate
>> zone for high;y modified data would make things a lot easier (maybe a
>> RAID1Cx zone), but that definitely would be a huge change on the way
>> things are handled.
> 
> 
> When you talk about DIO, do you mean O_DIRECT ? Because this is full reliable
> even without RAID56...
ehmm... I forgot a "not". So my last sentence is

          Because this is NOT fully reliable even without RAID56...

> See my email
> 
> "BUG: BTRFS and O_DIRECT could lead to wrong checksum and wrong data", sent 15/09/2017
> 
> 
> 

-- 
gpg @keyserver.linux.it: Goffredo Baroncelli <kreijackATinwind.it>
Key fingerprint BBF5 1610 0B64 DAC6 5F7D  17B2 0EDA 9B37 8B82 E0B5


  reply	other threads:[~2022-07-17 17:58 UTC|newest]

Thread overview: 88+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-16 14:31 [RFC ONLY 0/8] btrfs: introduce raid-stripe-tree Johannes Thumshirn
2022-05-16 14:31 ` [RFC ONLY 1/8] btrfs: add raid stripe tree definitions Johannes Thumshirn
2022-05-17  7:39   ` Qu Wenruo
2022-05-17  7:45     ` Johannes Thumshirn
2022-05-17  7:56       ` Qu Wenruo
2022-05-16 14:31 ` [RFC ONLY 2/8] btrfs: move btrfs_io_context to volumes.h Johannes Thumshirn
2022-05-17  7:42   ` Qu Wenruo
2022-05-17  7:51     ` Johannes Thumshirn
2022-05-17  7:58       ` Qu Wenruo
2022-05-17  8:01         ` Johannes Thumshirn
2022-05-16 14:31 ` [RFC ONLY 3/8] btrfs: read raid-stripe-tree from disk Johannes Thumshirn
2022-05-17  8:09   ` Qu Wenruo
2022-05-17  8:13     ` Johannes Thumshirn
2022-05-17  8:28       ` Qu Wenruo
2022-05-18 11:29         ` Johannes Thumshirn
2022-05-19  8:36           ` Qu Wenruo
2022-05-19  8:39             ` Johannes Thumshirn
2022-05-19 10:37               ` Qu Wenruo
2022-05-19 11:44                 ` Johannes Thumshirn
2022-05-19 11:48                   ` Qu Wenruo
2022-05-19 11:53                     ` Johannes Thumshirn
2022-05-19 13:26                       ` Qu Wenruo
2022-05-19 13:49                         ` Johannes Thumshirn
2022-05-19 22:56                           ` Qu Wenruo
2022-05-20  8:27                             ` Johannes Thumshirn
2022-05-16 14:31 ` [RFC ONLY 4/8] btrfs: add boilerplate code to insert raid extent Johannes Thumshirn
2022-05-17  7:53   ` Qu Wenruo
2022-05-17  8:00   ` Qu Wenruo
2022-05-17  8:05     ` Johannes Thumshirn
2022-05-17  8:09       ` Qu Wenruo
2022-05-16 14:31 ` [RFC ONLY 5/8] btrfs: add code to delete " Johannes Thumshirn
2022-05-17  8:06   ` Qu Wenruo
2022-05-17  8:10     ` Johannes Thumshirn
2022-05-17  8:14       ` Qu Wenruo
2022-05-17  8:20         ` Johannes Thumshirn
2022-05-17  8:31           ` Qu Wenruo
2022-05-16 14:31 ` [RFC ONLY 6/8] btrfs: add code to read " Johannes Thumshirn
2022-05-16 14:55   ` Josef Bacik
2022-05-16 14:31 ` [RFC ONLY 7/8] btrfs: zoned: allow zoned RAID1 Johannes Thumshirn
2022-05-16 14:31 ` [RFC ONLY 8/8] btrfs: add raid stripe tree pretty printer Johannes Thumshirn
2022-05-16 14:58 ` [RFC ONLY 0/8] btrfs: introduce raid-stripe-tree Josef Bacik
2022-05-16 15:04   ` Johannes Thumshirn
2022-05-16 15:10     ` Josef Bacik
2022-05-16 15:47       ` Johannes Thumshirn
2022-05-17  7:23 ` Nikolay Borisov
2022-05-17  7:31   ` Qu Wenruo
2022-05-17  7:41     ` Johannes Thumshirn
2022-05-17  7:32   ` Johannes Thumshirn
2022-07-13 10:54 ` RAID56 discussion related to RST. (Was "Re: [RFC ONLY 0/8] btrfs: introduce raid-stripe-tree") Qu Wenruo
2022-07-13 11:43   ` Johannes Thumshirn
2022-07-13 12:01     ` Qu Wenruo
2022-07-13 12:42       ` Johannes Thumshirn
2022-07-13 13:47         ` Qu Wenruo
2022-07-13 14:01           ` Johannes Thumshirn
2022-07-13 15:24             ` Lukas Straub
2022-07-13 15:28               ` Johannes Thumshirn
2022-07-14  1:08             ` Qu Wenruo
2022-07-14  7:08               ` Johannes Thumshirn
2022-07-14  7:32                 ` Qu Wenruo
2022-07-14  7:46                   ` Johannes Thumshirn
2022-07-14  7:53                     ` Qu Wenruo
2022-07-15 17:54                     ` Goffredo Baroncelli
2022-07-15 19:08                       ` Thiago Ramon
2022-07-16  0:34                         ` Qu Wenruo
2022-07-16 11:11                           ` Qu Wenruo
2022-07-16 13:52                             ` Thiago Ramon
2022-07-16 14:26                               ` Goffredo Baroncelli
2022-07-17 17:58                                 ` Goffredo Baroncelli [this message]
2022-07-17  0:30                               ` Qu Wenruo
2022-07-17 15:18                                 ` Thiago Ramon
2022-07-17 22:01                                   ` Qu Wenruo
2022-07-17 23:00                           ` Zygo Blaxell
2022-07-18  1:04                             ` Qu Wenruo
2022-07-15 20:14                       ` Chris Murphy
2022-07-18  7:33                         ` Johannes Thumshirn
2022-07-18  8:03                           ` Qu Wenruo
2022-07-18 21:49                         ` Forza
2022-07-19  1:19                           ` Qu Wenruo
2022-07-21 14:51                             ` Forza
2022-07-24 11:27                               ` Qu Wenruo
2022-07-25  0:00                             ` Zygo Blaxell
2022-07-25  0:25                               ` Qu Wenruo
2022-07-25  5:41                                 ` Zygo Blaxell
2022-07-25  7:49                                   ` Qu Wenruo
2022-07-25 19:58                               ` Goffredo Baroncelli
2022-07-25 21:29                                 ` Qu Wenruo
2022-07-18  7:30                       ` Johannes Thumshirn
2022-07-19 18:58                         ` Goffredo Baroncelli

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