RAID/LVM advice needed
by abisko00 from LinuxQuestions.org on (#6EENT)
Hi there!
Haven't been around for a while, but I guess this is the right crowd to ask this question:
I have a JBOD of 24 disks with 8 TB each which I want to set-up as redundant RAID volume for the storage of predominantly rather large files (~500 GB). Earlier, I was using a single 95 TB RAID-5 array on a PERC H840 controller. Which was probably not very smart, as I now learned, due to the need to sync many drives and the danger of non-recoverable data. It was recommended to split the 24 disks into 3-4 smaller arrays. I'd like to do that, but I need to combine them into one logical volume.
So the idea is to combine three hardware RAID-5 arrays to one linear logical volume in LVM. Again, I heard this is what LVM was developed for, but I find no examples from people who did that on such large arrays.
How does LVM affect hardware RAID-5 performance?
I am concerned about the two levels of combining the volumes. Adding level of complexity to my system appears dangerous to me. It seems more straightforward to have only one partition that does not require any configuration.
Comments highly appreciated.
Cheers
abisko00
Using Ubuntu 20.04
Haven't been around for a while, but I guess this is the right crowd to ask this question:
I have a JBOD of 24 disks with 8 TB each which I want to set-up as redundant RAID volume for the storage of predominantly rather large files (~500 GB). Earlier, I was using a single 95 TB RAID-5 array on a PERC H840 controller. Which was probably not very smart, as I now learned, due to the need to sync many drives and the danger of non-recoverable data. It was recommended to split the 24 disks into 3-4 smaller arrays. I'd like to do that, but I need to combine them into one logical volume.
So the idea is to combine three hardware RAID-5 arrays to one linear logical volume in LVM. Again, I heard this is what LVM was developed for, but I find no examples from people who did that on such large arrays.
How does LVM affect hardware RAID-5 performance?
I am concerned about the two levels of combining the volumes. Adding level of complexity to my system appears dangerous to me. It seems more straightforward to have only one partition that does not require any configuration.
Comments highly appreciated.
Cheers
abisko00
Using Ubuntu 20.04