[mythtv-users] 2 TB Hard Drive Recommendations

Richard Morton richard.e.morton at gmail.com
Mon Dec 6 18:49:43 UTC 2010

Just want to point out RAID5 is not a good solution for partitions
where lots of small modifications are made... such as for DBs in which
case use RAID 1 or RAID 1+0 (RAID 10).

When a (small modifying) write is made to a:
 - single drive, a write is made to the single drive
 - on a RAID 1, its made to two drives in parallel
 - on a RAID 1+0, its usually made to two drives in parallel,
sometimes 4 drives in parallel
 - on a RAID 5 array, it has to read all the drives not being
modified, the checksum is calculated and the data is written and the
parity is written two the two drives that need to be changed...

just my 2p worth...

I agree, RAID isnt a backup solution, unless you're backing up to an
independant device (that may be based on RAID) that holds the backup
data and at a bare minimum 2 complete iterations of it (plus your
incremental changes)


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