Hello all,
Testing stuff virtually over here before taking it to the physical servers.
I found a shortcut for creating a software RAID 10 ("--level=10"),
device in
CentOS 6.
Looking at the below, I don't see anything about a shortcut for RAID 60.
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/htm
l/Storage_Administration_Guide/s1-raid-levels.html
Is RAID 60 an uncommon RAID-configuration, as compared to RAID 10, and this
might be why it's missing?
Not too cumbersome to first create two RAID 6-arrays, then add them to a
RAID 0, but it does take some extra time.
Besides, I haven't found any way to fail a member disk, as is possible to do
when using RAID level 10.
Am I missing something here?
--
BW,
Sorin
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On 10/25/2016 05:41 AM, Sorin Srbu wrote:> I found a shortcut for creating a software RAID 10 ("--level=10"), device in > CentOS 6.That's not really a shortcut, per se. RAID10 in Linux is not necessarily similar to RAID1+0. The default, "near" layout is the classic 1+0 layout, but other modes of operation are supported by the RAID10 driver.> Looking at the below, I don't see anything about a shortcut for RAID 60.Correct. There's no such driver.> Besides, I haven't found any way to fail a member disk, as is possible to do > when using RAID level 10.If you built a RAID0 array of RAID6 arrays, then you'd fail a disk by marking it failed and removing it from whichever RAID6 array it was a member of, in the same fashion as you'd remove it from any other array type.
> -----Original Message----- > From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On > Behalf Of Gordon Messmer > Sent: den 25 oktober 2016 20:54 > To: CentOS mailing list <centos at centos.org> > Subject: Re: [CentOS] "Shortcut" for creating a software RAID 60? > > On 10/25/2016 05:41 AM, Sorin Srbu wrote: > > I found a shortcut for creating a software RAID 10 ("--level=10"),device in> > CentOS 6. > > That's not really a shortcut, per se. RAID10 in Linux is not > necessarily similar to RAID1+0. The default, "near" layout is the > classic 1+0 layout, but other modes of operation are supported by the > RAID10 driver.Thanks for the clarification. Close enough though, for my intended use! You mention modes however. I don't recall seeing any particular info on that. Care to elaborate a bit on that, if it's not too OT?> > Besides, I haven't found any way to fail a member disk, as is possibleto do> > when using RAID level 10. > > If you built a RAID0 array of RAID6 arrays, then you'd fail a disk by > marking it failed and removing it from whichever RAID6 array it was a > member of, in the same fashion as you'd remove it from any other array > type.Aha, thanks! -- //Sorin
On 10/25/2016 11:54 AM, Gordon Messmer wrote:> If you built a RAID0 array of RAID6 arrays, then you'd fail a disk by > marking it failed and removing it from whichever RAID6 array it was a > member of, in the same fashion as you'd remove it from any other array > type.FWIW, what I've done in the past is build the raid 6's with mdraid, then use LVM to stripe them into a volume group. -- john r pierce, recycling bits in santa cruz