Re: [CentOS] Software RAID10 - which two disks can fail?

2014-04-08 Thread John R Pierce
On 4/8/2014 12:35 AM, Rafał Radecki wrote: > The raid10 name is very misleading. I came to the same conclusion > yesterday: for sake of clarity I will make two raid1 arrays and combine > them into a raid0;) > > Thanks for all info. its striped mirrors, its just that it treats it all as one big rai

Re: [CentOS] Software RAID10 - which two disks can fail?

2014-04-08 Thread Rafał Radecki
The raid10 name is very misleading. I came to the same conclusion yesterday: for sake of clarity I will make two raid1 arrays and combine them into a raid0 ;) Thanks for all info. BR, Rafal. 2014-04-08 8:49 GMT+02:00 Christopher Chan : > On Tuesday, April 08, 2014 03:47 AM, Rafał Radecki wrote

Re: [CentOS] Software RAID10 - which two disks can fail?

2014-04-07 Thread Christopher Chan
On Tuesday, April 08, 2014 03:47 AM, Rafał Radecki wrote: > As far as I know raid10 is ~ "a raid0 built on top of two raid1" ( > http://en.wikipedia.org/wiki/Nested_RAID_levels#RAID_1.2B0 - raid10). So I > think that by default in my case: No, Linux md raid10 is NOT a nested raid setup where you bu

Re: [CentOS] Software RAID10 - which two disks can fail?

2014-04-07 Thread Keith Keller
On 2014-04-07, Rafa? Radecki wrote: > I would really appreciate a definite answer which partitions I can remove > and which I cannot remove at the same time because I need to perform some > disk maintenance tasks on this raid10 array. Thanks for all help! You're likely to get the most definitive

Re: [CentOS] Software RAID10 - which two disks can fail?

2014-04-07 Thread John R Pierce
On 4/7/2014 12:47 PM, Rafał Radecki wrote: > As far as I know raid10 is ~ "a raid0 built on top of two raid1" ( > http://en.wikipedia.org/wiki/Nested_RAID_levels#RAID_1.2B0 - raid10). So I > think that by default in my case: > > /dev/sda6 and /dev/sdb6 form the first "raid1" > /dev/sdd6 and /dev/s

[CentOS] Software RAID10 - which two disks can fail?

2014-04-07 Thread Rafał Radecki
Hi All. I have a server which uses RAID10 made of 4 partitions for / and boots from it. It looks like so: mdadm -D /dev/md1 /dev/md1: Version : 00.90 Creation Time : Mon Apr 27 09:25:05 2009 Raid Level : raid10 Array Size : 973827968 (928.71 GiB 997.20 GB) Used Dev Size : 48