Kamil Jońca wrote: > > Debian box with LVM > LVM uses 2 PV - raid devices each uses 2 HDD (rotating) > discs (with sata interfaces). > > Now I am considering replacing one PV with md device constisting of SSD > discs, so LVM will be have one "HDD" based pv and one SSD based PV. > Should I worry about anything (speed differences or sth)?
1. Refer to the disks in mdadm with the /dev/disk/by-id names, not /dev/sdb style names. 2. Use mdadm's RAID-1 with the write-intent bitmap feature and specify that the spinning disk will use the write-mostly feature. RAID 0 will be bad; don't try it. Good luck; I've never actually tried this, but thought about quite a bit. -dsr-
