RAID6 is double parity. That would make it ok to lose any 2 disks.
RAID10 you could theoretically lose up to half of the disks as long as
they weren't in the same mirrored pair, but yeah 2 in the same pair and
you're done.
The nice thing about RAID10 is the read performance because there will
be 2 copies of any block and you have double the chances of a head being
near one for random access, and both can be read simultaneously for
higher throughput. (haha remember when disks were round and had heads?)
.....this is all assuming the RAID controller doesn't have a hot spare
feature or some such. There are too many variations to generalize much.
On 12/30/2020 2:17 PM, Josh Baird wrote:
This isn't exactly true.
If you lose (2) disks in a (4) disk RAID10 array and both of the disks
are in the same set (mirror), you're screwed.
On Wed, Dec 30, 2020 at 11:43 AM Josh Luthman
<[email protected] <mailto:[email protected]>> wrote:
Raid5 means if you lose 2 disks you just lost all your data.
Raid10 means if you lost 2 disks you're still OK. Just get a
replacement in there already!
Josh Luthman
24/7 Help Desk: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373
On Wed, Dec 30, 2020 at 10:17 AM Steve Jones
<[email protected] <mailto:[email protected]>> wrote:
esx is the hardware "OS" So I cant see how you would achieve a
software RAID. unless you want to sit ESX on the platform with
each disk independent. then install your OS and build are raid
across the vdisks, sounds like a disaster waiting to happen,
but potentially not if youre backing up the vmdks. Kind of
weird if im understanding what youre wanting to achieve. My
operations platform is a raid10 across SSD, performance over
raid5 was notable. the boss still builds alot of raid5, to me
seems like saving the cost of a disk is offset in the long
term replacing failed disks.
Disks are relatively cheap, datacenter smart hands are not. a
couple more disks, a little more redundancy, less writes per
disk. I like to have a couple independent disks in esx
depending on the host. hot spares or static data storage
On Wed, Dec 30, 2020 at 8:27 AM Mark - Myakka Technologies
<[email protected] <mailto:[email protected]>> wrote:
Helping my son setup a ESXI server. Going into a datacenter
a few states away. I have only done some basic
ESXI setup when
fooling around with mikrotik. My other VM servers
sit on top of
ubuntu. I have always used ubuntu SW raid10 when
setting up my
servers.
Looks like ESXI can be HW raid only. Can't find anyway
of doing
SW raid. Anything I'm missing?
He is going to put SSD's in the server. I'm thinking
just going with
RAID 1 for some redundancy. Spanning across SSD's does
not seem to be
worth it for performance. Thought's on that?
--
Thanks,
Mark mailto:[email protected]
<mailto:[email protected]>
Myakka Technologies, Inc.
www.Myakka.com <http://www.Myakka.com>
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