Simon, Pay attention that /boot can be installed only on a single disk or RAID-1 where every disk can actually work as a stand alone disk.
I personally decided to use RAID-5 on 3 disks with RAID-1 on 3xsmall partitions for /boot and RAID-5 on the rest. RAID-5 also allows easier expansion in the future. On Tue, Nov 10, 2009 at 8:48 PM, Simon Baxter <linu...@nzbaxters.com> wrote: > Thanks - very useful! > > So what I'll probably do is as follows... > * My system has 4x SATA ports on the motherboard, to which I'll connect my > 4x 1.5TB drives. > * Currently 1 drive is in use with ~30G for / /boot and swap and ~1.4TB for > /media > * I'll create /dev/md2, using mdadm, in RAID1 across 2 ~1.4TB partitions on > 2 drives > * move all active recordings (~400G) to /dev/md2 > * split /dev/md2 and create a raid 1+0 (/dev/md1) using 4x partitions of > ~1.4TB across 4 drives > > At this point I have preserved all my data, and created a raid1+0 for > recordings and media. > > I should now use the remaining ~100G on each drive for raid protection for > (root) / and /boot. I've read lots on the web on this, but what's your > recommendation? RAID1 mirror across 2 of the disks for / (/dev/md0) and > install grub (/boot) on both so either will boot? > > > > On Tue, Nov 10, 2009 at 09:46:52PM +1300, Simon Baxter wrote: >> >>> What about a simple raid 1 mirror set? >>> >>> >> Ok.. short comparison, using a single disk as baseline. >> >> using 2 disks >> raid0: (striping) >> ++ double read throughput, >> ++ double write throughput, >> -- half the reliability (read: only use with good backup!) >> >> raid1: (mirroring) >> ++ double read throughput. >> o same write throughput >> ++ double the reliability >> >> >> using 3 disks: >> >> raid0: striping >> +++ tripple read performance >> +++ tripple write performance >> --- third of reliability >> >> raid1: mirroring >> +++ tripple read performance >> o same write throughput >> +++ tripple reliability >> >> raid5: (distributed parity) >> +++ tripple read performance >> - lower write performance (not due to the second write but due >> to the necessary reads) >> + sustains failure of any one drive in the set >> >> using 4 disks: >> >> raid1+0: >> ++++ four times the read performance >> ++ double write performance >> ++ double reliability >> >> >> please note: these are approximations and depending on your hardware >> they may be off by quite a bit. >> >> cheers >> -henrik >> >> >> _______________________________________________ >> vdr mailing list >> vdr@linuxtv.org >> http://www.linuxtv.org/cgi-bin/mailman/listinfo/vdr >> >> > > _______________________________________________ > vdr mailing list > vdr@linuxtv.org > http://www.linuxtv.org/cgi-bin/mailman/listinfo/vdr >
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