From: Grant <emailgrant@gmail.com>
To: Tanstaafl <tanstaafl@libertytrek.org>
Cc: Gentoo mailing list <gentoo-user@lists.gentoo.org>
Subject: Re: [gentoo-user] {OT} Need a new server
Date: Sun, 15 Sep 2013 04:15:06 -0700 [thread overview]
Message-ID: <CAN0CFw2+o-W5JphZ7uvVDtrwUcp3macBunUo-6=UM0ae3A=U0A@mail.gmail.com> (raw)
In-Reply-To: <5234494B.9010301@libertytrek.org>
>> http://blog.open-e.com/why-a-hot-spare-hard-disk-is-a-bad-idea/
>>
>> "Based on our long years of experience we have learned that during a
>> RAID rebuild the probability of an additional drive failure is quite
>> high – a rebuild is stressful on the existing drives."
>
> This is NOT true on a RAID 10... a rebuild is only stressful on the other
> drive in the mirrored pair, not the other drives.
>
> But, it is true for that one drive.
Why wouldn't it be true of RAID 10? Each drive only has one mirror,
so if a drive fails, its only mirror will be stressed by the rebuild
won't it?
> That said, it would be nice is the auto rebuild could be scripted such that
> a backup could be triggered and the auto-rebuild queued until the backup was
> complete.
>
> But, here is the problem there... a backup will stress the drive almost as
> much as the rebuild, because all the rebuild does is read/copy the contents
> of the one drive to the other one (ie, it re-mirrors).
>
>> Instead, how about a 6-drive RAID 10 array with no hot spare? My
>> guess is this would mean much greater fault-tolerance both overall and
>> during the rebuild process (once a new drive is swapped in). That
>> would mean not only potentially increased uptime but decreased
>> monitoring responsibility.
>
> I would still prefer a hot spare to not... in the real world, it has saved
> me exactly 3 out of 3 times...
You would prefer 4-drive RAID 10 plus a hot spare to 6-drive RAID 10?
Isn't 6-drive RAID 10 superior in every way except for cost (1 extra
drive)?
- Grant
next prev parent reply other threads:[~2013-09-15 11:15 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-13 20:00 [gentoo-user] {OT} Need a new server Grant
2013-09-13 20:39 ` Alan McKinnon
2013-09-13 21:39 ` Grant
2013-09-14 8:14 ` Alan McKinnon
2013-09-14 8:54 ` Grant
2013-09-14 9:02 ` Alan McKinnon
2013-09-14 9:14 ` Grant
2013-09-13 20:44 ` Michael Orlitzky
2013-09-13 21:47 ` Grant
2013-09-13 22:47 ` Peter Humphrey
2013-09-13 22:54 ` Daniel Frey
2013-09-14 8:50 ` Grant
2013-09-14 11:32 ` Tanstaafl
2013-09-15 11:15 ` Grant [this message]
2013-09-16 9:54 ` Tanstaafl
2013-09-14 14:37 ` Michael Orlitzky
2013-09-16 6:49 ` Grant
2013-09-16 13:10 ` Michael Orlitzky
2013-09-17 6:43 ` Grant
2013-09-17 12:30 ` Michael Orlitzky
2013-09-17 13:13 ` Grant
2013-09-17 16:46 ` Alan McKinnon
2013-09-13 23:17 ` Michael Orlitzky
2013-09-14 8:52 ` Grant
2013-09-14 11:35 ` Tanstaafl
2013-09-13 21:58 ` thegeezer
2013-09-13 22:14 ` Grant
2013-09-14 8:59 ` [gentoo-user] " Grant
2013-09-14 9:10 ` Alan McKinnon
2013-09-14 9:29 ` Grant
2013-09-14 11:07 ` Michael Hampicke
2013-09-15 11:07 ` Grant
2013-09-14 14:36 ` Alan McKinnon
2013-09-14 11:34 ` Tanstaafl
2013-09-14 14:42 ` Alan McKinnon
2013-09-14 11:04 ` thegeezer
2013-09-15 11:05 ` Grant
2013-09-14 11:18 ` [gentoo-user] " Tanstaafl
2013-09-15 11:10 ` Grant
2013-09-17 5:36 ` Pandu Poluan
2013-09-17 6:32 ` Grant
2013-09-17 9:24 ` Neil Bothwick
2013-09-17 10:01 ` Tanstaafl
2013-09-17 7:28 ` Grant
2013-09-17 7:37 ` Pandu Poluan
2013-09-17 9:49 ` Grant
2013-09-17 10:10 ` Alan McKinnon
2013-09-17 13:11 ` Grant
2013-09-17 16:49 ` Alan McKinnon
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAN0CFw2+o-W5JphZ7uvVDtrwUcp3macBunUo-6=UM0ae3A=U0A@mail.gmail.com' \
--to=emailgrant@gmail.com \
--cc=gentoo-user@lists.gentoo.org \
--cc=tanstaafl@libertytrek.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox