From: Josef Bacik <josef@toxicpanda.com>
To: Naohiro Aota <naohiro.aota@wdc.com>,
linux-btrfs@vger.kernel.org, David Sterba <dsterba@suse.com>
Cc: Chris Mason <clm@fb.com>, Nikolay Borisov <nborisov@suse.com>,
Damien Le Moal <damien.lemoal@wdc.com>,
Johannes Thumshirn <jthumshirn@suse.de>,
Hannes Reinecke <hare@suse.com>,
Anand Jain <anand.jain@oracle.com>,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v6 03/28] btrfs: Check and enable HMZONED mode
Date: Fri, 13 Dec 2019 11:21:07 -0500 [thread overview]
Message-ID: <a51f1292-3097-cd4b-bee5-dee5d4141ffb@toxicpanda.com> (raw)
In-Reply-To: <20191213040915.3502922-4-naohiro.aota@wdc.com>
On 12/12/19 11:08 PM, Naohiro Aota wrote:
> HMZONED mode cannot be used together with the RAID5/6 profile for now.
> Introduce the function btrfs_check_hmzoned_mode() to check this. This
> function will also check if HMZONED flag is enabled on the file system and
> if the file system consists of zoned devices with equal zone size.
>
> Additionally, as updates to the space cache are in-place, the space cache
> cannot be located over sequential zones and there is no guarantees that the
> device will have enough conventional zones to store this cache. Resolve
> this problem by completely disabling the space cache. This does not
> introduce any problems in HMZONED mode: all the free space is located after
> the allocation pointer and no free space is located before the pointer.
> There is no need to have such cache.
>
> For the same reason, NODATACOW is also disabled.
>
> Also INODE_MAP_CACHE is also disabled to avoid preallocation in the
> INODE_MAP_CACHE inode.
>
> In summary, HMZONED will disable:
>
> | Disabled features | Reason |
> |-------------------+-----------------------------------------------------|
> | RAID5/6 | 1) Non-full stripe write cause overwriting of |
> | | parity block |
> | | 2) Rebuilding on high capacity volume (usually with |
> | | SMR) can lead to higher failure rate |
> |-------------------+-----------------------------------------------------|
> | space_cache (v1) | In-place updating |
> | NODATACOW | In-place updating |
> |-------------------+-----------------------------------------------------|
> | fallocate | Reserved extent will be a write hole |
> | INODE_MAP_CACHE | Need pre-allocation. (and will be deprecated?) |
> |-------------------+-----------------------------------------------------|
> | MIXED_BG | Allocated metadata region will be write holes for |
> | | data writes |
> | async checksum | Not to mix up bios by multiple workers |
>
> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
> Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
I assume the progs will be updated to account for these limitations as well?
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Thanks,
Josef
next prev parent reply other threads:[~2019-12-13 20:39 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-13 4:08 [PATCH v6 00/28] btrfs: zoned block device support Naohiro Aota
2019-12-13 4:08 ` [PATCH v6 01/28] btrfs: introduce HMZONED feature flag Naohiro Aota
2019-12-13 4:08 ` [PATCH v6 02/28] btrfs: Get zone information of zoned block devices Naohiro Aota
2019-12-13 16:18 ` Josef Bacik
2019-12-18 2:29 ` Naohiro Aota
2019-12-13 4:08 ` [PATCH v6 03/28] btrfs: Check and enable HMZONED mode Naohiro Aota
2019-12-13 16:21 ` Josef Bacik [this message]
2019-12-18 4:17 ` Naohiro Aota
2019-12-13 4:08 ` [PATCH v6 04/28] btrfs: disallow RAID5/6 in " Naohiro Aota
2019-12-13 16:21 ` Josef Bacik
2019-12-13 4:08 ` [PATCH v6 05/28] btrfs: disallow space_cache " Naohiro Aota
2019-12-13 16:24 ` Josef Bacik
2019-12-18 4:28 ` Naohiro Aota
2019-12-13 4:08 ` [PATCH v6 06/28] btrfs: disallow NODATACOW " Naohiro Aota
2019-12-13 16:25 ` Josef Bacik
2019-12-13 4:08 ` [PATCH v6 07/28] btrfs: disable fallocate " Naohiro Aota
2019-12-13 16:26 ` Josef Bacik
2019-12-13 4:08 ` [PATCH v6 08/28] btrfs: implement log-structured superblock for " Naohiro Aota
2019-12-13 16:38 ` Josef Bacik
2019-12-13 21:58 ` Damien Le Moal
2019-12-17 19:17 ` Josef Bacik
2019-12-13 4:08 ` [PATCH v6 09/28] btrfs: align device extent allocation to zone boundary Naohiro Aota
2019-12-13 16:52 ` Josef Bacik
2019-12-13 4:08 ` [PATCH v6 10/28] btrfs: do sequential extent allocation in HMZONED mode Naohiro Aota
2019-12-17 19:19 ` Josef Bacik
2019-12-13 4:08 ` [PATCH v6 11/28] btrfs: make unmirroed BGs readonly only if we have at least one writable BG Naohiro Aota
2019-12-17 19:25 ` Josef Bacik
2019-12-18 7:35 ` Naohiro Aota
2019-12-18 14:54 ` Josef Bacik
2019-12-13 4:08 ` [PATCH v6 12/28] btrfs: ensure metadata space available on/after degraded mount in HMZONED Naohiro Aota
2019-12-17 19:32 ` Josef Bacik
2019-12-13 4:09 ` [PATCH v6 13/28] btrfs: reset zones of unused block groups Naohiro Aota
2019-12-17 19:33 ` Josef Bacik
2019-12-13 4:09 ` [PATCH v6 14/28] btrfs: redirty released extent buffers in HMZONED mode Naohiro Aota
2019-12-17 19:41 ` Josef Bacik
2019-12-13 4:09 ` [PATCH v6 15/28] btrfs: serialize data allocation and submit IOs Naohiro Aota
2019-12-17 19:49 ` Josef Bacik
2019-12-19 6:54 ` Naohiro Aota
2019-12-19 14:01 ` Josef Bacik
2020-01-21 6:54 ` Naohiro Aota
2019-12-13 4:09 ` [PATCH v6 16/28] btrfs: implement atomic compressed IO submission Naohiro Aota
2019-12-13 4:09 ` [PATCH v6 17/28] btrfs: support direct write IO in HMZONED Naohiro Aota
2019-12-13 4:09 ` [PATCH v6 18/28] btrfs: serialize meta IOs on HMZONED mode Naohiro Aota
2019-12-13 4:09 ` [PATCH v6 19/28] btrfs: wait existing extents before truncating Naohiro Aota
2019-12-17 19:53 ` Josef Bacik
2019-12-13 4:09 ` [PATCH v6 20/28] btrfs: avoid async checksum on HMZONED mode Naohiro Aota
2019-12-13 4:09 ` [PATCH v6 21/28] btrfs: disallow mixed-bg in " Naohiro Aota
2019-12-17 19:56 ` Josef Bacik
2019-12-18 8:03 ` Naohiro Aota
2019-12-13 4:09 ` [PATCH v6 22/28] btrfs: disallow inode_cache " Naohiro Aota
2019-12-17 19:56 ` Josef Bacik
2019-12-13 4:09 ` [PATCH v6 23/28] btrfs: support dev-replace " Naohiro Aota
2019-12-17 21:05 ` Josef Bacik
2019-12-18 6:00 ` Naohiro Aota
2019-12-18 14:58 ` Josef Bacik
2019-12-13 4:09 ` [PATCH v6 24/28] btrfs: enable relocation " Naohiro Aota
2019-12-17 21:32 ` Josef Bacik
2019-12-18 10:49 ` Naohiro Aota
2019-12-18 15:01 ` Josef Bacik
2019-12-13 4:09 ` [PATCH v6 25/28] btrfs: relocate block group to repair IO failure in HMZONED Naohiro Aota
2019-12-17 22:04 ` Josef Bacik
2019-12-13 4:09 ` [PATCH v6 26/28] btrfs: split alloc_log_tree() Naohiro Aota
2019-12-13 4:09 ` [PATCH v6 27/28] btrfs: enable tree-log on HMZONED mode Naohiro Aota
2019-12-17 22:08 ` Josef Bacik
2019-12-18 9:35 ` Naohiro Aota
2019-12-13 4:09 ` [PATCH v6 28/28] btrfs: enable to mount HMZONED incompat flag Naohiro Aota
2019-12-17 22:09 ` Josef Bacik
2019-12-13 4:15 ` [PATCH RFC v2] libblkid: implement zone-aware probing for HMZONED btrfs Naohiro Aota
2019-12-19 20:19 ` [PATCH v6 00/28] btrfs: zoned block device support David Sterba
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