adding another 1TB drive to raid5 array.
so today i have encountered a problem with my what was my 3 * 1TB drive raid5 1.7TB in size. I tried to add another 1TB drive to it. I choose to use the following guide for the task:
http://scotgate.org/?p=107 but encountered a problem 17.1% some 8 or so hours in of the grow command. now when i boot up only two of the drives show up. I'm lead to believe this is due to a stripe-size reassignment problem with the growth of a raid5 array of size greater than a few terabytes. can anyone confirm or deny this. and is there a patch that can be applied for this? distro of choice for this file server is debian. obviously i want to keep the majority of the data on the three disk array as it sort of is. the increase is due to current size needing to be increased so losing it would be disasterous thank you in advance for your time. |
What are the contents of /proc/mdstat, as well as fdisk -l?
Also, are all 4 drives exactly the same? Are you using raid partitions or using the luns directly? |
before i add the other two drives gives me:
Code:
md0 : inactive sda[1] sdd[2] Code:
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes |
drives are all the same size.
the one drive i am adding is a different make. a samsung as opposed to 2 * identical maxtor and 1 * hitachi all 1TB in size. |
1TB Addition to 3 disk raid5 array
Apon reflection i think i should have mentioned that having failed step 2 in above guide i did accidently try and fail step 3 so i reckon i might have broken the superblock but am unsure how to try and rectify this. suggestions welcome. i didn't backup the data as i didn't think i would have enough space to backup to but have found a big enough space to allow me to save my stuff. how would u suggest i try and recover data even if it could in degraded mode to migrate my data. My original mdadm.conf was posted here. Thanks inadvance for ur time
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I'm pretty sure my problems were related to a faulty sata cable.
so i started raid5 array creation four days ago. Does anybody know how long i should wait for this creation process to complete? what is the maths for this? |
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