[cisco-voip] UCS C210 Replace 146 GB Disk in RAID5 with 300 GB Disk

[Ryan Huff]

As I’ve read and understood; it isn’t due to actual functionality though. It is as you say, due mostly to longer rebuild times (indexing a physically larger geometry than the rest of the array members, for a smaller logical geometry) and the risk (rare IMO) to the rest of the array (as a rebuild will stress the array and could cause other, near-death disks to fail thereby causing the array to fail). It also wastes the extra horsepower of the disk since the existing RAID can’t capitalize on the resources of the larger disk.

So in a case of, would you go out and buy a new disk that way .... I’d say no; but if that is the result of a covered RMA, I’d say go for it.

I’m no diskologist though ... just based on my own experiences of what has worked for me for the last couple of decades ... and I’ve never lost a server ... outside of that one time when my pants pocket snagged the release on the 2nd disk in a R5 on my way out the door ... bad memories.

-Ryan

On Nov 14, 2017, at 9:03 AM, Charles Goldsmith <wokka at justfamily.org<mailto:wokka at justfamily.org>> wrote:

Keep in mind, RAID 5 is ok for smaller disks, but larger disks it's no longer recommended, but sadly, the best article about it is from Dell: http://en.community.dell.com/techcenter/b/techcenter/archive/2012/08/14/new-equallogic-raid-tech-report-considerations-and-best-practices-released

With bigger disks, it's even said that RAID 6 is no longer good enough, due to large rebuild times in case of a failure.  http://www.zdnet.com/blog/storage/why-raid-6-stops-working-in-2019/805

On Tue, Nov 14, 2017 at 7:41 AM, Ryan Huff <ryanhuff at outlook.com<mailto:ryanhuff at outlook.com>> wrote:
Reto,

Seek/rpm speeds and media type (flash, sata ... etc) are usually what matter the most for RAID disks. If your only difference is total storage capacity, the bigger disk will usually work just fine, your just gonna waste the additional 154GB of space (because the RAID will only provision 146GB of that 300GB disk).

Just remember on a RAID 5, don’t pull/lose more that 1 disk at a time .... painful lesson long ago I share over beer every now and then.

-Ryan

On Nov 14, 2017, at 8:23 AM, Reto Gassmann <voip at mrga.ch<mailto:voip at mrga.ch>> wrote:

Hallo

We have a UCS C210 Server with 10x146 GB Disks. One of the Disks failed and I got a 300 GB replacement Disk from Cisco.

Is that a problem if I replace the defect 146 Disk in the RAID 5 with a 300 GB Disk?

Thanks for help
Regards Reto
_______________________________________________
cisco-voip mailing list
cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
https://puck.nether.net/mailman/listinfo/cisco-voip

_______________________________________________
cisco-voip mailing list
cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
https://puck.nether.net/mailman/listinfo/cisco-voip


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/cisco-voip/attachments/20171114/d4eea671/attachment.html>