[ale] hdparm and RAID cards

[Jim Kinney]

That's been my use as well until now. I've got a support ticket open with
avago.

On Sep 2, 2016 5:19 PM, "Lightner, Jeffrey" <JLightner at dsservices.com>
wrote:

> Most of the MegaRaid cards I’ve seen are made by LSI/Avago (including the
> Dell PERC/SAS which are OEMed from LSI/Avago).
>
>
>
> During POST when it find the BIOS of these cards it usually gives you a
> Ctrl-R option to go into that for config.   I don’t know whether that
> config allows you to change individual drive cache setup.   Typically I
> don’t muck with such setups on the assumption the card was already
> optimized.    I’ve only used it for creating/modifying the RAID layout.
>
>
>
> Once they’re in a RAID presented by the card you’re not going to see the
> individual drives at OS level – you’ll just see the entire RAID set(s) as
> individual drive(s).   e.g. If you had created a RAID1 of 2 disks for OS
> then a RAID5 for remaining disks you’re only going to see /dev/sda and
> /dev/sdb at OS level.
>
>
>
>
>
> *From:* ale-bounces at ale.org [mailto:ale-bounces at ale.org] *On Behalf Of *Jim
> Kinney
> *Sent:* Friday, September 02, 2016 4:13 PM
> *To:* Atlanta Linux Enthusiasts - Yes! We run Linux!
> *Subject:* [ale] hdparm and RAID cards
>
>
>
> How the $(^*#!!! do I use hdparm to enable write caching on a giant pile
> of drives that make up a hardware RAID 6 array?
>
>
>
> I can peek through the controller with smartctl for health monitoring. The
> RAID controller (MegaRAID) has a tool to see that each drive has a N/A
> status for hardware cache (these drives all have a large multi-MB cache).
>
>
>
> I _really_ don't want to have to convert all 28 drives to RAID0 so I can
> get a /dev/sdx node for hdparm.
>
> --
>
> James P. Kinney III
>
>
>
> Every time you stop a school, you will have to build a jail. What you
>
> gain at one end you lose at the other. It's like feeding a dog on his
>
> own tail. It won't fatten the dog.
>
> - Speech 11/23/1900 Mark Twain
>
>
>
> http://heretothereideas.blogspot.com/
>
>
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