Version 1 superblocks allow for an arbitrarily large internal bitmap. It does this by explicitly given the data-start and data-size. Superblock From Linux Raid Wiki. Jump to: navigation , search. This page is obsolete; see RAID superblock formats Linux raid reserves a bit of space called a superblock on each component device.
There are several versions of superblocks but they can be split into 3 groups: ancient pre It is the default as of v3. The sub-versions differ primarily solely?
This will desynchronise the array and compromise the data. The other important factor for superblock location is that PC bootloaders need to write to the first sector of a device to make it bootable. At the moment, there is no tool to convert between the different superblock versions. However, Neil Brown has posted a work-around to the linux-raid mailing list see [1] that allows upgrading an existing RAID from a 0.
By forcing to recreate the RAID with a newer metadata version, mdadm will overwrite an existing superblock with a 1. This method can only be used to upgrade from 0. When re-creating the array, it is important to specify all details according to the output of the first command. Yes, raid10 can be created with 3 disks but only because you will tell it one member is missing.
It needs 4 at least. Creating it with 3 in fact you are creating it degraded from the start like one disk already failed. So, now that you know the correct disk letters, can you zero the superblock? Is it sdf1? If it still doesn't work, try adding --force to the zero command. That should force it. I also notice sdg1 and sdh1 have filesystem on them. You shouldn't format partition that you will use for mdadm. It can work, but it's not how it's usually done.
The filesystem lies on the md devices, not on the physical partitions. So, you don't format the partitions with ext4 or any other filesystem. February 2nd, 8. If you had the patients Just curious, but why did the partition letters change before? February 2nd, 9. Re: mdadm will not zero superblock Disk letters can change for various reasons.
Most often is if you have something like usb stick connected when booting, it can be detected first and the disks can come later. So letters can be moved by one. I have to admit I find it strange your lsblk shows disks E-H. What is it with A-D? Martin Martin 5, 35 35 gold badges silver badges bronze badges.
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