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									Replacing a going-to-fail RAID-0 disk - Stripe Volumes				            </title>
            <link>https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/</link>
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                        <title>Replacing a going-to-fail RAID-0 disk</title>
                        <link>https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/paged/2/#post-1577</link>
                        <pubDate>Fri, 16 Sep 2016 18:37:51 +0000</pubDate>
                        <description><![CDATA[I don&#039;t know what you did, then. These are the original two Stripe disks?

Send us a SoftRAID support file and we can see if there is any partition map data on the two disks. (support@soft...]]></description>
                        <content:encoded><![CDATA[I don't know what you did, then. These are the original two Stripe disks?

Send us a SoftRAID support file and we can see if there is any partition map data on the two disks. (support@softraid.com)]]></content:encoded>
						                            <category domain="https://forums.softraid.com/stripe-volumes/">Stripe Volumes</category>                        <dc:creator>SoftRAID Support</dc:creator>
                        <guid isPermaLink="true">https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/paged/2/#post-1577</guid>
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				                    <item>
                        <title>Replacing a going-to-fail RAID-0 disk</title>
                        <link>https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/paged/2/#post-1576</link>
                        <pubDate>Fri, 16 Sep 2016 18:20:24 +0000</pubDate>
                        <description><![CDATA[You have the original two drives in your case?

Does SoftRAID see a stripe volume portion on either disk?


I don&#039;t think so. Attached is a shot from SoftRAID of the two disks.]]></description>
                        <content:encoded><![CDATA[<blockquote>
You have the original two drives in your case?

Does SoftRAID see a stripe volume portion on either disk?
</blockquote>

I don't think so. Attached is a shot from SoftRAID of the two disks.]]></content:encoded>
						                            <category domain="https://forums.softraid.com/stripe-volumes/">Stripe Volumes</category>                        <dc:creator>bdphifer</dc:creator>
                        <guid isPermaLink="true">https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/paged/2/#post-1576</guid>
                    </item>
				                    <item>
                        <title>Replacing a going-to-fail RAID-0 disk</title>
                        <link>https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/paged/2/#post-1574</link>
                        <pubDate>Fri, 16 Sep 2016 16:27:36 +0000</pubDate>
                        <description><![CDATA[You have the original two drives in your case?

Does SoftRAID see a stripe volume portion on either disk?]]></description>
                        <content:encoded><![CDATA[You have the original two drives in your case?

Does SoftRAID see a stripe volume portion on either disk?]]></content:encoded>
						                            <category domain="https://forums.softraid.com/stripe-volumes/">Stripe Volumes</category>                        <dc:creator>SoftRAID Support</dc:creator>
                        <guid isPermaLink="true">https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/paged/2/#post-1574</guid>
                    </item>
				                    <item>
                        <title>Replacing a going-to-fail RAID-0 disk</title>
                        <link>https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/#post-1571</link>
                        <pubDate>Fri, 16 Sep 2016 13:30:40 +0000</pubDate>
                        <description><![CDATA[I am now in the process of trying to back-up my drives. The two drives do not show up as a RAID. How do I get my Mac to recognize them as a RAID?

TIA!]]></description>
                        <content:encoded><![CDATA[I am now in the process of trying to back-up my drives. The two drives do not show up as a RAID. How do I get my Mac to recognize them as a RAID?

TIA!]]></content:encoded>
						                            <category domain="https://forums.softraid.com/stripe-volumes/">Stripe Volumes</category>                        <dc:creator>bdphifer</dc:creator>
                        <guid isPermaLink="true">https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/#post-1571</guid>
                    </item>
				                    <item>
                        <title>Replacing a going-to-fail RAID-0 disk</title>
                        <link>https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/#post-1534</link>
                        <pubDate>Fri, 02 Sep 2016 22:15:58 +0000</pubDate>
                        <description><![CDATA[The plan of putting the original disks and volume back together and backing up is best. Then if there are parts of one disk that cannot be read, you can isolate that to a specific folder/fil...]]></description>
                        <content:encoded><![CDATA[The plan of putting the original disks and volume back together and backing up is best. Then if there are parts of one disk that cannot be read, you can isolate that to a specific folder/files.

The second (good) drive from the stripe appears fine. Unless SoftRAID tells you otherwise. So you can repurpose it, yes.]]></content:encoded>
						                            <category domain="https://forums.softraid.com/stripe-volumes/">Stripe Volumes</category>                        <dc:creator>SoftRAID Support</dc:creator>
                        <guid isPermaLink="true">https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/#post-1534</guid>
                    </item>
				                    <item>
                        <title>Replacing a going-to-fail RAID-0 disk</title>
                        <link>https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/#post-1532</link>
                        <pubDate>Fri, 02 Sep 2016 20:40:03 +0000</pubDate>
                        <description><![CDATA[Also, can I shut off the drive case that is holding the two drives without doing any damage to the original good drive of the RAID?]]></description>
                        <content:encoded><![CDATA[Also, can I shut off the drive case that is holding the two drives without doing any damage to the original good drive of the RAID?]]></content:encoded>
						                            <category domain="https://forums.softraid.com/stripe-volumes/">Stripe Volumes</category>                        <dc:creator>bdphifer</dc:creator>
                        <guid isPermaLink="true">https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/#post-1532</guid>
                    </item>
				                    <item>
                        <title>Replacing a going-to-fail RAID-0 disk</title>
                        <link>https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/#post-1531</link>
                        <pubDate>Fri, 02 Sep 2016 20:36:52 +0000</pubDate>
                        <description><![CDATA[disk3 is the source. My comments above are accurate. 

it may be best not to try to go forward with this plan, but backup/recreate the volume. At least you will know for certain, which fil...]]></description>
                        <content:encoded><![CDATA[<blockquote>
disk3 is the source. My comments above are accurate. 

it may be best not to try to go forward with this plan, but backup/recreate the volume. At least you will know for certain, which file(s) are not readable. 

Using dd worked, but you have at least a 2MB portion of your volume (its a stripe) that contains damaged files and you don't know where that is.
</blockquote>

Thanks for the quick response! Part of me would like to avoid doing a d/l of 4+Tb, so I have a couple thoughts on solving that.

1) putting the old RAID back together and moving some (if not all) of the data to a third drive, then creating a new RAID with the good drive and the new one and moving back to there.

2) purchasing a new drive and creating a RAID from scratch. Then with the old RAID back together moving data to the new drive (or d/l if necessary).

I think I can do the copy from the old RAID if I can put it together by going to the online back-up and see what was copied.

My other question is whether the good drive of the old RAID is still OK. When all is done, can I just wipe it clean and use it for something? Is the 'bad' drive even good for anything? If I wipe that clean would it be useable ? (although not anything super-important since it's not in the best of shape)

Again, I can't say how pleased I have been with the support from SoftRAID. Thanks!!!]]></content:encoded>
						                            <category domain="https://forums.softraid.com/stripe-volumes/">Stripe Volumes</category>                        <dc:creator>bdphifer</dc:creator>
                        <guid isPermaLink="true">https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/#post-1531</guid>
                    </item>
				                    <item>
                        <title>Replacing a going-to-fail RAID-0 disk</title>
                        <link>https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/#post-1527</link>
                        <pubDate>Fri, 02 Sep 2016 19:31:48 +0000</pubDate>
                        <description><![CDATA[disk3 is the source. My comments above are accurate. 

it may be best not to try to go forward with this plan, but backup/recreate the volume. At least you will know for certain, which fil...]]></description>
                        <content:encoded><![CDATA[disk3 is the source. My comments above are accurate. 

it may be best not to try to go forward with this plan, but backup/recreate the volume. At least you will know for certain, which file(s) are not readable. 

Using dd worked, but you have at least a 2MB portion of your volume (its a stripe) that contains damaged files and you don't know where that is.]]></content:encoded>
						                            <category domain="https://forums.softraid.com/stripe-volumes/">Stripe Volumes</category>                        <dc:creator>SoftRAID Support</dc:creator>
                        <guid isPermaLink="true">https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/#post-1527</guid>
                    </item>
				                    <item>
                        <title>Replacing a going-to-fail RAID-0 disk</title>
                        <link>https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/#post-1526</link>
                        <pubDate>Fri, 02 Sep 2016 19:22:15 +0000</pubDate>
                        <description><![CDATA[Here is the text from my dd this morning.

/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_schem...]]></description>
                        <content:encoded><![CDATA[Here is the text from my dd this morning.

/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *121.3 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage Macintosh HD            120.5 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
/dev/disk1 (internal, virtual):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           +120.2 GB   disk1
                                 Logical Volume on disk0s2
                                 2440A4A2-0978-4BDE-81FE-8E519C8DB1A7
                                 Unlocked Encrypted
/dev/disk2 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *62.5 GB    disk2
   1:                  Apple_HFS MacBook Air Extra St... 62.5 GB    disk2s1
/dev/disk3 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *3.0 TB     disk3
   1:                        EFI EFI                     209.7 MB   disk3s1
   2: FA709C7E-65B1-4593-BFD5-E71D61DE9B02               3.0 TB     disk3s2
   3:                 Apple_Boot Boot OSX                134.2 MB   disk3s3
   4: B6FA30DA-92D2-4A9A-96F1-871EC6486200               2.3 MB     disk3s5
/dev/disk4 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *3.0 TB     disk4
   1:                        EFI EFI                     209.7 MB   disk4s1
   2:                  Apple_HFS Media (New)             3.0 TB     disk4s2

Familys-MacBook-Air:~ PhiferFamily$ $ diskutil unmount/dev/disk3
-bash: $: command not found
Familys-MacBook-Air:~ PhiferFamily$ $ diskutil unmount /dev/disk3
-bash: $: command not found
Familys-MacBook-Air:~ PhiferFamily$ diskutil unmount /dev/disk3
disk3 was already unmounted or it has a partitioning scheme so use "diskutil unmountDisk" instead
Familys-MacBook-Air:~ PhiferFamily$ diskutil unmountdisk /dev/disk3
Unmount of all volumes on disk3 was successful
Familys-MacBook-Air:~ PhiferFamily$ diskutil unmountdisk /dev/disk4
Unmount of all volumes on disk4 was successful
Familys-MacBook-Air:~ PhiferFamily$ sudo dd bs=1m if=/dev/rdisk3 of=/dev/rdisk4 conv=noerror,sync

WARNING: Improper use of the sudo command could lead to data loss
or the deletion of important system files. Please double-check your
typing when using sudo. Type "man sudo" for more information.

To proceed, enter your password, or type Ctrl-C to abort.

Password:

dd: /dev/rdisk3: Input/output error
123889+0 records in
123889+0 records out
129907032064 bytes transferred in 872.206742 secs (148940642 bytes/sec)
dd: /dev/rdisk3: Input/output error
dd: /dev/rdisk3: Input/output error
123890+0 records in
123890+0 records out
129908080640 bytes transferred in 875.584727 secs (148367230 bytes/sec)
dd: /dev/rdisk3: Input/output error

I think I typed the command correctly, but I may just have bad eyes!

Also, the box that has the two drives in it is still sputtering it's lights as if the two drives are talking. If I stop that drive, is it going to hurt anything?

Again, thanks for your assistance.]]></content:encoded>
						                            <category domain="https://forums.softraid.com/stripe-volumes/">Stripe Volumes</category>                        <dc:creator>bdphifer</dc:creator>
                        <guid isPermaLink="true">https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/#post-1526</guid>
                    </item>
				                    <item>
                        <title>Replacing a going-to-fail RAID-0 disk</title>
                        <link>https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/#post-1523</link>
                        <pubDate>Fri, 02 Sep 2016 18:17:55 +0000</pubDate>
                        <description><![CDATA[The two disks may not be identical. 

On the original problem, this means at least 1MB of your disk was not copied.

Because the dd command you used was in the form of:
sudo dd bs=1m if...]]></description>
                        <content:encoded><![CDATA[The two disks may not be identical. 

On the original problem, this means at least 1MB of your disk was not copied.

Because the dd command you used was in the form of:
sudo dd bs=1m if=/dev/rdisk1 of=/dev/rdisk2 conv=noerror,sync

this means dd copied 1MB of zeros where the error happened.

I recommend repeating the dd command. Hopefully there is not an error again. If disk3 was the "source" it means that the disk cannot be read. So you have a 1MB "hole" in your data. A better solution for you may be to backup the volume and create it from scratch. When you backup, you will learn what file(s) are damaged, because OS X won''t be able to copy them. Using dd, you do not know what files are broken from the bad disk, until you get a corrupted file message when you try to open it.

this is why using dd works for "geek" approaches, but is bad practice, as if you are replacing a failing disk, you get a result that leaves you uncertain of where your data corruption (loss) is.]]></content:encoded>
						                            <category domain="https://forums.softraid.com/stripe-volumes/">Stripe Volumes</category>                        <dc:creator>SoftRAID Support</dc:creator>
                        <guid isPermaLink="true">https://forums.softraid.com/stripe-volumes/replacing-a-going-to-fail-raid-0-disk/#post-1523</guid>
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