On 04/12/2013 01:01 AM, David Miller wrote:
You simply match up the Linux /dev/sdX designation with the drives
serial number using smartctl. When I first bring the array online I
have a script that greps out the drives serial numbers from smartctl
and creates a neat text file with the
hi,
yeah, until a disk fails on a 40 disk array and the chassis LEDs on the
backplane don't light up to indicate which disk it is and your
operations monkey pulls the wrong one and crash the whole raid.
that is why I put a label on every drive tray that is visible without
pulling the disk.
We build a storage unit that anyone using Centos can build. It is based on the
3ware 9750-16 controller. It has 16 x 2 TB Sata 6 gb/s disks. We always set it
up as a 15 disk RAID 6 array and a hot spare. We have seen multiple instances
were the A/C has gone off but the customer's UPS kept the
Hi, Seth,
Seth Bardash wrote:
We build a storage unit that anyone using Centos can build. It is based on
the 3ware 9750-16 controller. It has 16 x 2 TB Sata 6 gb/s disks. We
always set it up as a 15 disk RAID 6 array and a hot spare. We have seen
Interesting. We're still playing with sizing
On 4/12/2013 12:11 PM, m.r...@5-cent.us wrote:
Interesting. We're still playing with sizing the RAID sets and volumes.
The prime consideration for this is that the filesystem utils still have
problems with 16TB (and they appear to have been saying that fixing this
is a priority for at least a
I'm setting up this huge RAID 6 box. I've always thought of hot spares,
but I'm reading things that are comparing RAID 5 with a hot spare to RAID
6, implying that the latter doesn't need one. I *certainly* have enough
drives to spare in this RAID box: 42 of 'em, so two questions: should I
assign
From: m.r...@5-cent.us m.r...@5-cent.us
To: CentOS mailing list centos@centos.org
Sent: Thursday, April 11, 2013 8:36 AM
Subject: [CentOS] RAID 6 - opinions
I'm setting up this huge RAID 6 box. I've always thought of hot spares,
but I'm reading things that are comparing RAID 5 with a hot
From: Joseph Spenner joseph85...@yahoo.com
A RAID5 with a hot spare isn't really the same as a RAID6. For those not
familiar with this, a RAID5 in degraded mode (after it lost a disk) will
suffer
a performance hit, as well as while it rebuilds from a hot spare. A RAID6
after
losing a
On 04/11/2013 11:36 AM, m.r...@5-cent.us wrote:
I'm setting up this huge RAID 6 box. I've always thought of hot spares,
but I'm reading things that are comparing RAID 5 with a hot spare to RAID
6, implying that the latter doesn't need one. I *certainly* have enough
drives to spare in this RAID
On 4/11/2013 8:36 AM, m.r...@5-cent.us wrote:
I'm setting up this huge RAID 6 box. I've always thought of hot spares,
but I'm reading things that are comparing RAID 5 with a hot spare to RAID
6, implying that the latter doesn't need one. I*certainly* have enough
drives to spare in this RAID
On 2013-04-11, Joseph Spenner joseph85...@yahoo.com wrote:
From: m.r...@5-cent.us m.r...@5-cent.us
To: CentOS mailing list centos@centos.org
Sent: Thursday, April 11, 2013 8:36 AM
Subject: [CentOS] RAID 6 - opinions
I'm setting up this huge RAID 6 box. I've always thought of hot spares
John R Pierce wrote:
On 4/11/2013 8:36 AM, m.r...@5-cent.us wrote:
I'm setting up this huge RAID 6 box. I've always thought of hot spares,
but I'm reading things that are comparing RAID 5 with a hot spare to
RAID 6, implying that the latter doesn't need one. I*certainly* have
enough
drives
m.r...@5-cent.us wrote:
snip
Ok, listening to all of this, I've also been in touch with a tech from the
vendor*, who had a couple of suggestions: first, two RAID sets with two
global hot spares.
I've just spoken with my manager, and we're going with that, then one of
the tech's other
On 4/11/2013 12:30 PM, m.r...@5-cent.us wrote:
Ok, listening to all of this, I've also been in touch with a tech from the
vendor*, who had a couple of suggestions: first, two RAID sets with two
global hot spares.
I would test how long a drive rebuild takes on a 20 disk RAID6.I
suspect,
From: John R Pierce pie...@hogranch.com
To: centos@centos.org
Sent: Thursday, April 11, 2013 1:24 PM
Subject: Re: [CentOS] RAID 6 - opinions
On 4/11/2013 12:30 PM, m.r...@5-cent.us wrote:
Ok, listening to all of this, I've also been in touch with a tech
On 4/11/2013 1:36 PM, Joseph Spenner wrote:
But isn't that one of the benefits of RAID6? (not much degraded/latency
effect during a rebuild, less impact on performance during rebuild, so longer
times are acceptable?)
trouble comes in 3s.
--
john r pierce
On 4/11/2013 1:20 PM, m.r...@5-cent.us wrote:
Followup comment: I created the two RAID sets, then started to create the
volume sets... and realized I didn't know if it was*possible*, much less
desirable, to have a volume set that spanned two RAID sets. Talked it over
with my manager, and I
- Original Message -
From: Joseph Spenner joseph85...@yahoo.com
To: CentOS mailing list centos@centos.org
Sent: Thursday, April 11, 2013 1:36:29 PM
Subject: Re: [CentOS] RAID 6 - opinions
From: John R Pierce pie...@hogranch.com
To: centos
- Original Message -
From: Reindl Harald h.rei...@thelounge.net
To: CentOS mailing list centos@centos.org
Cc: David C. Miller mille...@fusion.gat.com
Sent: Thursday, April 11, 2013 4:17:18 PM
Subject: Re: [CentOS] RAID 6 - opinions
Am 12.04.2013 01:13, schrieb David C. Miller
On 2013-04-11, David C. Miller mille...@fusion.gat.com wrote:
Just for reference, I have a 24 x 2TB SATAIII using CentOS 6.4 Linux MD RAID6
with two of those 24 disks as hotspares. The drives are in a Supermicro
external SAS/SATA box connected to another Supermicro 1U computer with an
- Original Message -
From: Keith Keller kkel...@wombat.san-francisco.ca.us
To: centos@centos.org
Sent: Thursday, April 11, 2013 4:34:20 PM
Subject: Re: [CentOS] RAID 6 - opinions
On 2013-04-11, David C. Miller mille...@fusion.gat.com wrote:
Just for reference, I have a 24 x
On 4/11/2013 5:04 PM, David C. Miller wrote:
The LSI 9200's I use are nothing more than a dumb $300 host bus adapter. No
RAID levels or special features. I prefer to NOT use hardware RAID
controllers when I can. With a generic HBA the hard drives are seen raw to
the OS. You can use smartctl
On 2013/04/11 10:36 AM, Joseph Spenner wrote:
From: John R Pierce pie...@hogranch.com
To: centos@centos.org
Sent: Thursday, April 11, 2013 1:24 PM
Subject: Re: [CentOS] RAID 6 - opinions
On 4/11/2013 12:30 PM, m.r...@5-cent.us wrote:
Ok, listening
On 2013-04-12, Miranda Hawarden-Ogata hawar...@ifa.hawaii.edu wrote:
RAID6 means you can handle 2 disk failures, but the third one will drop
your array, if I'm remembering correctly. And the larger the number of
disks, the higher the chance that you'll have disk failures...
Yes, and yes.
On Apr 11, 2013, at 5:25 PM, John R Pierce pie...@hogranch.com wrote:
On 4/11/2013 5:04 PM, David C. Miller wrote:
The LSI 9200's I use are nothing more than a dumb $300 host bus adapter. No
RAID levels or special features. I prefer to NOT use hardware RAID
controllers when I can. With a
On 04/11/2013 06:36 PM, m.r...@5-cent.us wrote:
I'm setting up this huge RAID 6 box. I've always thought of hot spares,
but I'm reading things that are comparing RAID 5 with a hot spare to RAID
6, implying that the latter doesn't need one. I *certainly* have enough
drives to spare in this RAID
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