LVM with SSD and SATA hard disks

Question

Is it possible to create LVM partitions for both SSD and SATA hard disks? I mean if there isn't any conflicts.

score 5 · Answer 1 · answered Oct 29 '12 at 15:54

5

LVM doesn't care what the underlying block devices are so you can mix any physical devices, or even software raid devices and it just works.

answered Oct 29 '12 at 15:54

StarNamer

3

Can LVM arrange that data often accessed is put on SSD and data rarely accessed is in hard disk? – user4951 Jan 24 '13 at 10:14
As far as I know, no. LVM just treats a Volume Group as a contiguous block of space and doesn't care what the underlying physical devices are. – StarNamer Jan 25 '13 at 10:59
1

@JimThio No, LVM tries to minimize "fragmentation", even on ssds (although in the case of the LVM it is not suboptimal, because there much fewer "files" (volumes) as in an FS and they change relatively seldom their size). But you can create cache logical volumes ( http://man7.org/linux/man-pages/man7/lvmcache.7.html ), which enables you to cache a slower HDD with a faster SSD. – peterh Aug 01 '15 at 01:30

score 4 · Accepted Answer · answered Oct 29 '12 at 15:55

4

I don't see any points on doing so, you want a Volume Group that contains both SATA and SSD, that's possible.

Just create multiple PVs, with pvcreate /dev/partition_name

And create a volume group that use those PVs, with vgcreate

And do the partition of that VG.

answered Oct 29 '12 at 15:55

daisy

1

How would TRIM be managed? Would the OS optimize io based on type of disk? Or is LVM blind to this? – Gabriel Fair Feb 17 '18 at 19:13

score 1 · Answer 3 · answered Jun 28 '20 at 10:53

1

You are able to use the SDD or part of it as a cache using lvmcache.

answered Jun 28 '20 at 10:53

Pedro Rolo

3 Answers3