Mdadm-faq

From Linux Raid Wiki
(Difference between revisions)
Jump to: navigation, search
Line 4: Line 4:
 
Answer 4b: The FAQ says that for a 4-disk raid10 array, you can survive two disk failures in half of the cases. The real figure is that in 2/3 of the cases you can survive.  
 
Answer 4b: The FAQ says that for a 4-disk raid10 array, you can survive two disk failures in half of the cases. The real figure is that in 2/3 of the cases you can survive.  
  
Answer 6: The raid10 layout actually makes sense with only 2 disks, the FAQ says 3 disks are needed.
+
Answer 6: The raid10 layout actually makes sense with only 2 disks, the FAQ says 3 disks are needed. Also "somewhat improved performance" is not adequeate, raid10,f2 offers something like twice the performance of normal RAID1+0 for sequential reading.
  
 
The FAQ references http://aput.net/~jheiss/raid10/ which actually does not refer to current Linux kernel raid10 technology, but to RAID1+0 versus RAID0+1 nested raid layout.
 
The FAQ references http://aput.net/~jheiss/raid10/ which actually does not refer to current Linux kernel raid10 technology, but to RAID1+0 versus RAID0+1 nested raid layout.

Revision as of 14:19, 20 December 2008

Debian has a [FAQ http://svn.debian.org/wsvn/pkg-mdadm/mdadm/trunk/debian/FAQ?op=file&rev=0&sc=0] on Linux raid. Some comments:

Answer 4b: The FAQ says that for a 4-disk raid10 array, you can survive two disk failures in half of the cases. The real figure is that in 2/3 of the cases you can survive.

Answer 6: The raid10 layout actually makes sense with only 2 disks, the FAQ says 3 disks are needed. Also "somewhat improved performance" is not adequeate, raid10,f2 offers something like twice the performance of normal RAID1+0 for sequential reading.

The FAQ references http://aput.net/~jheiss/raid10/ which actually does not refer to current Linux kernel raid10 technology, but to RAID1+0 versus RAID0+1 nested raid layout.

Personal tools