From: NeilBrown <neilb@suse.com>
To: V <viswesh.vichu@gmail.com>
Cc: linux-raid@vger.kernel.org
Subject: Re: Resync issue in RAID1
Date: Fri, 28 Oct 2016 17:01:06 +1100 [thread overview]
Message-ID: <87r371rp0d.fsf@notabene.neil.brown.name> (raw)
In-Reply-To: <CAF9xHmQfUDOYFNa1uehqsz=arx-x24DuavX1sdBY313mdt0GEw@mail.gmail.com>
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On Fri, Oct 28 2016, V wrote:
> Hi Neil,
>
> Thanks for the response. But during this phase, why is the scsi driver
> complaining about bad block number ?
>
> Oct 18 03:52:56 kernel: [ 52.869378] sd 0:0:0:0: [sda] Bad block
> number requested
Because md is asking to read blocks are offsets which are not a multiple
of 8 sectors.
NeilBrown
> Oct 18 03:52:56 kernel: [ 52.869414] sd 0:0:0:0: [sda] Bad block
> number requested
> Oct 18 03:52:56 kernel: [ 52.869436] sd 0:0:0:0: [sda] Bad block
> number requested
> Oct 18 03:52:56 kernel: [ 52.869465] sd 0:0:0:0: [sda] Bad block
> number requested
> Oct 18 03:52:56 kernel: [ 52.869503] sd 0:0:1:0: [sdb] Bad block
> number requested
>
> Thanks,
> V
>
> On Thu, Oct 27, 2016 at 9:01 PM, NeilBrown <neilb@suse.com> wrote:
>> On Sat, Oct 22 2016, V wrote:
>>
>>> Hi,
>>>
>>> I am facing an issue during RAID1 resync. I have an ubuntu
>>> 4.4.0-31-generic running with raid1 configured with 2 disks as active
>>> and 2 as spares. On the first powercycle, after installing RAID, i see
>>> the following messages in kern.log
>>>
>>>
>>> My disks are configured with 4K sector size (both logical and
>>> physical) (sda and sdb are active disks for this raid)
>>>
>>>
>>> ===========
>>> Oct 18 03:52:56 kernel: [ 52.869113] md: using 128k window, over a
>>> total of 51167104k.
>>> Oct 18 03:52:56 kernel: [ 52.869114] md: resuming resync of md2 from checkpoint.
>>
>> This line (above) combined with ...
>>
>>> Oct 18 03:52:56 kernel: [ 52.869536] md/raid1:md2: sda: unrecoverable I/O read error for block 3
>>
>> this line suggests that when you shut down, md had already started a
>> resync, and it had checkpointed at block '3'.
>>
>> The subsequent error are:
>>
>>> Oct 18 03:52:56 kernel: [ 52.869692] md/raid1:md2: sda: unrecoverable I/O read error for block 131
>>> Oct 18 03:52:56 kernel: [ 52.869837] md/raid1:md2: sda: unrecoverable I/O read error for block 259
>>> Oct 18 03:52:56 kernel: [ 52.870022] md/raid1:md2: sda: unrecoverable I/O read error for block 387
>>
>> which are every 128 blocks (aka sectors) from '3'.
>> I know what caused that. The patch below will stop it happening again.
>>
>> You might be able get your array working again by stopping it
>> and assembling with --update=resync.
>> That will reset the checkpoint to 0.
>>
>> NeilBrown
>>
>> diff --git a/drivers/md/md.c b/drivers/md/md.c
>> index 2cf0e1c00b9a..aa2ca23463f4 100644
>> --- a/drivers/md/md.c
>> +++ b/drivers/md/md.c
>> @@ -8099,7 +8099,8 @@ void md_do_sync(struct md_thread *thread)
>> mddev->curr_resync > 2) {
>> if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
>> if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
>> - if (mddev->curr_resync >= mddev->recovery_cp) {
>> + if (mddev->curr_resync >= mddev->recovery_cp &&
>> + mddev->curr_resync > 3) {
>> printk(KERN_INFO
>> "md: checkpointing %s of %s.\n",
>> desc, mdname(mddev));
> --
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next prev parent reply other threads:[~2016-10-28 6:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-21 15:53 Resync issue in RAID1 V
2016-10-28 4:01 ` NeilBrown
2016-10-28 5:33 ` V
2016-10-28 6:01 ` NeilBrown [this message]
2016-10-28 6:07 ` V
2016-11-04 3:33 ` NeilBrown
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