From: d tbsky <tbskyd@gmail.com>
To: list Linux RAID <linux-raid@vger.kernel.org>
Subject: add new disk with dd
Date: Thu, 29 Apr 2021 16:52:21 +0800 [thread overview]
Message-ID: <CAC6SzHLDYhQDtfQMYozN6EBYB=nsKvB77hmyByZNr9uTpQH+KQ@mail.gmail.com> (raw)
Hi:
I want to replace a fault disk for software raid5. there is
something like grub/biosgrub at the beginning of the disk, so if I can
use command below to copy them:
"dd if=/dev/sda of=/dev/sdb bs=1M count=10"
if it is a gpt disk I can use sgdisk to copy the partition table then
radmonize guid.
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? or mdadm will
understand the superblock/bitmap at new disk is invalid and just
overwrite everything?
next reply other threads:[~2021-04-29 8:52 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-29 8:52 d tbsky [this message]
2021-04-29 9:05 ` add new disk with dd Roman Mamedov
2021-04-29 9:21 ` Mateusz
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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