[mythtv-users] RAID: full disk or partition (was: Question re: available SATA ports and linux software RAID)

Kenni Lund kenni at kelu.dk
Sun Apr 24 06:04:30 UTC 2011

2011/4/24 Jean-Yves Avenard <jyavenard at gmail.com>:
> On 24 April 2011 11:29, John Drescher <drescherjm at gmail.com> wrote:
>> At work where I have 12 to 15 linux software raid arrays I have moved
>> to using only raid arrays with partitions as raid members. I believe
>> this is better for management and I usually have more than 1 raid
>> array using the same disks. Raid1 for boot, raid 5/6 for os and raid
>> 5/6 for data (usually lvm on top of this so I can subdivide the data).
> And what difference to using a full disk would that provide? From what
> you describe ; all of this can still be done with md and full disks as
> opposed to a partition using the full disk

It makes it possible to use distinct RAID-levels on the same disks.
With a 3 disks, OS+applications+swap can be put on RAID1 across all
three disks, while data can be put on RAID5. With one disk failure,
nothing will happen, with two disk failures, data will be lost but
server and applications will continue to run, with three disk failures
the server will fail completely. Makes sense on some setups, where
high performance isn't required.

Best regards

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