Hi,
I'm looking for a method for doing RAID migration while keeping the
data available.
the migrations I'm interested with are:
1. Single drive -RAID1/RAID5
2. RAID1 - RAID5.
the mdadm and kernel doesn't seem to provide built-in and crash-proof
solution. but I found that RAID5 on 2 drives in
On 8/7/07, saeed bishara [EMAIL PROTECTED] wrote:
Hi,
I'm looking for a method for doing RAID migration while keeping the
data available.
the migrations I'm interested with are:
1. Single drive -RAID1/RAID5
2. RAID1 - RAID5.
1. is a bit complicated, as a raid device on a disk is slightly
On 8/7/07, Tuomas Leikola [EMAIL PROTECTED] wrote:
On 8/7/07, saeed bishara [EMAIL PROTECTED] wrote:
Hi,
I'm looking for a method for doing RAID migration while keeping the
data available.
the migrations I'm interested with are:
1. Single drive -RAID1/RAID5
2. RAID1 - RAID5.
1.
I've noticed, that whenever I use 1.1 or 1.2 superblock format, mdadm
will always report version 1, when i.e. mdadm -E --scan is issued.
Also, in these two cases, mdadm -A --scan won't work, unless proper
ARRAY line is present in mdadm.conf (and if metadata is part of the
description, it must
On Tuesday August 7, [EMAIL PROTECTED] wrote:
2. should be simple as (offline) re-creating the raid as raid5.
this didn't work, I created raid1 array on sda[12], then stopped it,
and created new raid5 on sda[123], the data on the raid1 was not
preserved.
Create the new raid5 on sda[12] (same
A 2-disk raid5 and a 2-disk raid1 put the data in exactly the same
place - is that what you wanted to know?
yes, exactly.
NeilBrown
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Neil Brown schrieb:
(...)
- can I really assume that RAID 5 on 2 hdds (degraded mode) will
function as raid 5?
You should test by using loopback devices and files. But why degraded?
raid5 of two disks should look like raid1.
I meant to ask whether raid 5 on 2 disks will function as raid1 :(
how can I create raid 5 array that preserves the contents of a given
disk (part of the array)?
I can do that in two steps, raid 5 on two disks then reshape it to be
real raid5, but is there a direct way to do it?
saeed
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the
On Tuesday August 7, [EMAIL PROTECTED] wrote:
I've noticed, that whenever I use 1.1 or 1.2 superblock format, mdadm
will always report version 1, when i.e. mdadm -E --scan is issued.
Also, in these two cases, mdadm -A --scan won't work, unless proper
ARRAY line is present in mdadm.conf
On Tuesday August 7, [EMAIL PROTECTED] wrote:
how can I create raid 5 array that preserves the contents of a given
disk (part of the array)?
I can do that in two steps, raid 5 on two disks then reshape it to be
real raid5, but is there a direct way to do it?
What do you mean by real raid 5.
On Tuesday August 7, [EMAIL PROTECTED] wrote:
On 8/7/07, Neil Brown [EMAIL PROTECTED] wrote:
On Tuesday August 7, [EMAIL PROTECTED] wrote:
how can I create raid 5 array that preserves the contents of a given
disk (part of the array)?
I can do that in two steps, raid 5 on two disks then
mdadm --grow /dev/md0 --raid-disks=3
the mdadm --grow supports saving backup file that can be used to
re-assemble the array in case of crash during the critical section.
Any idea what is the size of file? or is there any upper limit in the
case of array of 5 drives?
saeed
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