From: Mateusz <mateusz-lists@ant.gliwice.pl>
To: list Linux RAID <linux-raid@vger.kernel.org>, d tbsky <tbskyd@gmail.com>
Subject: Re: add new disk with dd
Date: Thu, 29 Apr 2021 11:21:40 +0200 [thread overview]
Message-ID: <7903054.T7Z3S40VBb@matkor-hp> (raw)
In-Reply-To: <CAC6SzHLDYhQDtfQMYozN6EBYB=nsKvB77hmyByZNr9uTpQH+KQ@mail.gmail.com>
On czwartek, 29 kwietnia 2021 10:52:21 CEST d tbsky wrote:
> however dd may also copy the mdadm superblock which include internal
> bitmap(since I don't caculate correct size). I don't know if there is
> risk that mdadm will be confused with the bitmap in new disk. although
> I have tried and it seems work fine.
> should I disable internal bitmap before add new disk?
No.
> or mdadm will
> understand the superblock/bitmap at new disk is invalid and just
> overwrite everything?
Should in most cases [1], but IMHO it's good idea to
mdadm --zero-superblock /dev/YOU_ARE_SURE_IS_ONE_YOU_WANT_TO_ADD
before adding disk already used somewhere else.
BTW, IMHO it's better to clone partition layout, and than install bootloaders
instead of dding disk.
[1] If disk/part was already used / cloned in same array it's bitmap may be
recognized, not synced, resulting likely broken array.
--
Mateusz
(...) mam brata - poważny, domator, liczykrupa, hipokryta, pobożniś,
krótko mówiąc - podpora społeczeństwa."
Nikos Kazantzakis - "Grek Zorba"
next prev parent reply other threads:[~2021-04-29 9:29 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-29 8:52 add new disk with dd d tbsky
2021-04-29 9:05 ` Roman Mamedov
2021-04-29 9:21 ` Mateusz [this message]
2021-04-29 15:32 ` d tbsky
2021-04-29 15:34 ` Reindl Harald
2021-05-01 10:07 ` Wols Lists
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