RAID autodetect in fdisk -l


 
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# 1  
RAID autodetect in fdisk -l

Hello,

Please refer to the below output:

Code:
[root@cincl1001a ~]# fdisk -l /dev/sda

Disk /dev/sda: 598.9 GB, 598999040000 bytes
255 heads, 63 sectors/track, 72824 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          15      120456   fd  Linux raid autodetect
/dev/sda2              16          16        8032+  83  Linux
/dev/sda3              17       69039   554427247+  83  Linux
/dev/sda4           69040       72824    30403012+   f  W95 Ext'd (LBA)
/dev/sda5           69040       70344    10482381   fd  Linux raid autodetect
/dev/sda6           70345       71649    10482381   fd  Linux raid autodetect
/dev/sda7           71650       71910     2096451   fd  Linux raid autodetect
/dev/sda8           71911       72171     2096451   fd  Linux raid autodetect
/dev/sda9           72172       72432     2096451   fd  Linux raid autodetect
/dev/sda10          72433       72521      714861   fd  Linux raid autodetect
/dev/sda11          72522       72824     2433816   fd  Linux raid autodetect

Please help me understand what's the meaning of Linux raid autodetect , Linux and W95Ext'd (LBA) devices?

Best regards,
Vishal
# 2  
I can't really explain what 'linux raid autodetect' is without repeating linux, raid, and autodetect. They are members of a software RAID containing enough information to assemble them into a working disk automatically. Linux wraps them with the RAID partition type to store that working information. What their real partition types are, if any, is difficult to tell without taking the RAID online.

The w95 ext'd is an "extended" partiton, i.e. it allows partition numbers higher than 4 to exist. Partitions 5-11 actually exist inside it. It's "w95" just because Windows 95 added this kind of partition type for "large" disks.

Last edited by Corona688; 01-29-2015 at 12:09 PM..
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