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I have multiple physical disks of different sizes that I wish to create one large pool of storage space on. The purpose of this large pool of space is to store a large encrypted file which is too large to be put on any single disk.

The problem with Snap RAID is that I can't have one file that spans multiple drives.

If I I create a large logical volume for Snap RAID then I run into the problem that I have no disks large enough to hold the parity for the single large logical volume. However I am not sure how LVM will handle it if I use the data partitions created by Snap raid as isn't LVM handled at a lower level?

How can I combine Snap RAID and LVM so that I can have one continuous pool of storage that can has parity calculated for each physical drive?

Thanks

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  • Uh, isn't "Snap RAID above LVM" the same as "LVM below Snap RAID"? Commented Apr 6, 2019 at 12:22
  • I described it poorly. I will try rephrase it. Commented Apr 6, 2019 at 14:12

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Let me say straight up that I'm not familiar with Snap RAID.

If you want to involve LVM, you need to know that it allows you to coalesce different physical volumes (PV) to create a single volume group (VG).

So if Snap RAID lets you create multiple protected spaces you can put a PV on each and then amalgamate them into the one VG that can contain a Logical Volume (LV) with your filesystem and your large file.

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  • I assumed, perhaps incorrectly, because all disks on Snap RAID need to have the same file system that I could not combine disks disks without a file system. From my basic knowledge of LVM you can't use a disk as part of a VG if it already has a file system. Is this correct? Commented Apr 6, 2019 at 15:00
  • That is correct. A disk or partition must be given over to LVM Once you've done so you can carve out LVs on which you place a filesystem. Commented Apr 6, 2019 at 17:31

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