From: Andrei Borzenkov <arvidjaar@gmail.com>
To: Anand Jain <anand.jain@oracle.com>,
Tomasz Chmielewski <mangoo@wpkg.org>,
Btrfs BTRFS <linux-btrfs@vger.kernel.org>
Subject: Re: how to replace a failed drive?
Date: Thu, 2 Sep 2021 11:00:20 +0300 [thread overview]
Message-ID: <3d2ca50d-3f86-4b8d-ea42-2d7ca0135c52@gmail.com> (raw)
In-Reply-To: <70615a2e-bf3e-c56b-d536-48bd9cfdfb8c@oracle.com>
On 02.09.2021 10:45, Anand Jain wrote:
> On 02/09/2021 06:07, Tomasz Chmielewski wrote:
>> I'm trying to follow
>> https://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices#Replacing_failed_devices
>> to replace a failed drive. But it seems to be written by a person who
>> never attempted to replace a failed drive in btrfs filesystem, and who
>> never used mdadm RAID (to see how good RAID experience should look like).
>>
>> What I have:
>>
>> - RAID-10 over 4 devices (/dev/sd[a-d]2)
>> - 1 disk (/dev/sdb2) crashed and was no longer seen by the operating
>> system
>> - it was replaced using hot-swapping - new drive registered itself as
>> /dev/sde
>> - I've partitioned /dev/sde, so that /dev/sde2 matches the size of
>> other btrfs devices
>> - because I couldn't remove the faulty device (it wouldn't go below my
>> current number of devices) I've added the new device to btrfs filesystem:
>>
>
>
>> btrfs device add /dev/sde2 /data/lxd
>
> Wiki is correct.
>
> $ btrfs replace start 7 /dev/sdf1 /mnt
>
Where exactly user is supposed to find out the correct number of missing
device? Because
...
>>
>> # btrfs filesystem show /data/lxd
>> Label: 'lxd5' uuid: 2b77b498-a644-430b-9dd9-2ad3d381448a
>> Total devices 5 FS bytes used 2.84TiB
>> devid 1 size 1.73TiB used 1.60TiB path /dev/sda2
>> devid 3 size 1.73TiB used 1.60TiB path /dev/sdd2
>> devid 4 size 1.73TiB used 1.60TiB path /dev/sdc2
>> devid 6 size 1.73TiB used 0.00B path /dev/sde2
>> *** Some devices missing
>>
It only shows existing devices. "Some devices missing" is not exactly
helping. More useful would be "devid 7 missing".
next prev parent reply other threads:[~2021-09-02 8:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-01 22:07 how to replace a failed drive? Tomasz Chmielewski
2021-09-02 0:15 ` Remi Gauvin
2021-09-02 6:03 ` Nikolay Borisov
2021-09-02 6:16 ` Nikolay Borisov
2021-09-02 7:45 ` Anand Jain
2021-09-02 8:00 ` Andrei Borzenkov [this message]
2021-09-02 8:04 ` Nikolay Borisov
2021-09-02 9:23 ` Tomasz Chmielewski
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