Mailinglist Archive: opensuse (946 mails)

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Re: [opensuse] WD Green AV HD: rsync read errors mapping
On 03/09/17 09:36 AM, Carlos E. R. wrote:
On 2017-09-03 14:30, Anton Aylward wrote:
On 02/09/17 06:01 AM, Carlos E. R. wrote:
Yes, it is very slow to run.

Yes, but that seems excessive to me.

I realise that there are a number of tunable parameters to the 'badblocks'
command, such as the block size.
And yes, if you have a 4K physical then setting the block size to 4k rather
than
its default 1K will probably help. Certainly on drives over 2T.

If this is true, it should be automatic.
Next time I'll have to remember this.

The man page states that the default is 1K.



Of course it is a destructive test, but we knew that to start with.

But badblocks is not destructive.
I don't know exactly how badblocks work.

The man page seems pretty clear.


Normally, badblocks will refuse to do a read/write or a non-destructive
test on a device which is mounted, since either can cause the system to
potentially crash and/or damage the filesystem even if it is mounted
read-only. This can be overridden using the -f flag, but should
almost never be used --- if you think you're smarter than the badblocks
program, you almost certainly aren't.

But I don't think that applies if you are testing a new device

-n Use non-destructive read-write mode. By default only a
non-destructive read-only test is done. This option must not be
combined with the -w option, as they are mutually exclusive.

I think that means 'read-write-readback' Of course if the write back of the
original data goes bad ...

-w Use write-mode test. With this option, badblocks scans for bad
blocks by writing some patterns (0xaa, 0x55, 0xff, 0x00) on
every block of the device, reading every block and comparing the
contents. This option may not be combined with the -n option, as
they are mutually exclusive.

To my mind, that should be used when testing a new drive.
that's what I used on my newly acquired 1T drive.

IIR the test ran within 12 hours.

--
A: Yes.
> Q: Are you sure?
>> A: Because it reverses the logical flow of conversation.
>>> Q: Why is top posting frowned upon?


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