Indeed, I'm thinking of using 2 CompactFlash ATA disks. One fully read only with just a small partition writable that will keep /etc/asterisk (astlinux mounts read-only always and only mounts read-write if you need to change/save the config). No worries about unclean shutdown.
The second disk I will use for voicemail, and I can swap it every year before it wears down.
Better than that, mirror the disk. Then when one drive fails Linux will automatically use the other disk. You can go one step more and define a third disk as a "hot spare" then after Linux detects the drive failure and switches to the surviving twin it will also bring up the hot spare and begin building a replacement for the dead twin. You can then swap out the dead drive with no need to power down the server and declare the new drive as the new "hot spare" I would mirror the read-only patition also
It you truely want "5 nines" you have to set things up so that you can do normal maintanance (swapping out drives, power supplies and the like without powering down.
I thought of that but that's not much use with flash disks. Flash can only be written to a number of times. If I would do raid1 on two flash drives and they reach that limit they might die shortly after each other.
Raid1 is a good solution when doing real harddrives. I may consider doing raid1 with two laptop harddiscs. laptop drives do not consume a lot of power nor do they produce any heat.
Alternatively I could consider hardware raid1 with one ATA flash drive and one laptop drive, chances of them dying both at the same time are slim.
I will do some testing on the behaviour of * when the partition where voicemail is stored is failing. If * will just skip voicemail that would be good enough for me, I don't care about voicemail being unavailable, i just dont want it to bring the whole box down.
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