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7

This is a bit nuts... That's too many disks for a RAID5. It's offset by the fact that you have two hot-spare drives, but damn!! However, you've already expanded the underlying Array, but not the Logical Drive. Remember, the "Array" is the physical grouping of disks. The "Logical Drive" is what you assign RAID level to. You can have multiple Logical Drives ...


1

Unused Space: 8974754 MB - that 8.55TB. There's your missing space. You should be able to expand it with hpacucli command (modify size=max parameter).


1

I went ahead and just tried it, and the answer is YES. A two-disk RAID5 using mdadm superblock version 1.2 will in fact retain its data upon failure and removal of one of the disks. e.g: mdadm /dev/md0 --fail /dev/sdc --remove /dev/sdc mdadm --zero-superblock /dev/sdc


-1

Raid5 is a pain in the event of system failure. Each manufacturer does it slightly differently, so generally for quick recovery, you need an identical system. As a result, it will not be possible to plug the drives into another system to pull the data off. That said, there is software available that allows you to rebuild data from a RAID5 array, but it is ...


3

First: DON'T ever use a RAID5, especially not with disks that size. The reason is that it's very likely you end up with an error during a rebuild after a failed disk, which will make the array a total failure. To your questions: one hard drive crash I can replace failed disk with a new similar one and embedded software will rebuild the entire system ...


0

When assembling an array, both drive order and chunk size are of utmost importance. Please consider that, while Linux software RAID switched to use 512K-sized chunks recently, some years ago it used 64K-size chunks. This means that your previous array was probably created with the old default 64K-chunk. Retry to assemble the array using 64K chunks and ...


-4

You can rebuild the array but only one time. READ IT, do it save your data and be carefull for the future I did it for HP MSA Storage so I think this option you have also on other NAS devices, so it worth to do it: this is the magic command and info how to bring your array back to life: Login: manage Password: ******* HP StorageWorks MSA2012i System Name: ...


1

Absolutely do not try a similar thing without having a proper backup. I even discourage you to replace the broken disk without first taking a complete backup: if a second disk fails during reconstruction, you will be in troubles. So, first thing to do is to take a coherent backup of all your data. Then, if you really want RAID1 over RAID5, the safer bet is ...


9

You'd be left with only half the capacity, so if the file system was more than half full already, it would be impossible. Even if there is sufficiently free space, the operation involves resizing the file system, which requires intimate knowledge of the file system. Moreover applying ordinary resizing tools to a degraded RAID5 before converting it to RAID1 ...


1

I've had to deal with 2 failed drive RAID 5 arrays, and the short answer is you have to send all drives which were part of the array out for recovery if you want to get that data back. It WILL cost you thousands of dollars, so it will be up to management to decide whether the lost productivity is worth the cost. In general RAID 5 will stripe data across ...


2

In an n-disk RAID5, you need n-1 disks to read back the data. If two drives are dead, no other disks will contain a full set of data and you have to resort to your backup. For speed purposes, data is striped over the disks to allow for faster reads.


0

The order of the disks won't matter, the configuration for the RAID is stored on the controller, which is in your older system and moving the disks to another controller will just present 8 new disks for it use. It won't know about any existing data. Was the file system encrypted or just a standard RAID 5? Use RAID 6 next time :)



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