Hi list,
speaking about software raid, not hardware controller based.
I am trying to go for some local OpenSuse machine and adding some
storage to it. Was considering Raid6, and now reading about a bit and
people left and right scaremongering about the larger the disks these
days in the double digit terabyte capacities even, the more likely it
is that during a reconstruction of a raid subsequent errors would
occur.
I would absolutely like to keep my data consistent, and I am not
thinking about double digit terabytes either, would stick to 2TB or
4TB disks, with Raid6 thats at least 4 physical drives.
Now I am wondering if it possible to use a good robust file system
that can add some more parity or check blocks or redundancy on top of
the hardware disks, to absolutely be able to always read my data.
I can't add multiple machines or like those high availability stuff
like clusters and what not I read about DRBD (Distributed Replicated
Block Device), or maybe I am just too scared by those technical terms
or consider myself to be just a simpleton and wanting to keep it
rather simple.
My use case here is also not constant availablity, when a disk needs
to be replaced, so be it, but I don't want to lose my data that I can
not ever read certain parts of it again or such stuff.
The thing that came to my mind was, if there is some file systems that
would add redundancy and robustness onto the mdraid system of the
linux kernel?
Anyone with some useful insights? Roughly speaking, I was considering
some simple pcie esata interfaced controller card and an external case
enclosure with esata port and portmulitplier stuff inside, that can
present at least 4 physical disks as JBOD, just a bunch of disks, so
that the Linux can seem them all separately.
Speed and rebuild times are not my concern, but data persistence and
data integrity. Not even number of physical disks, I could live with
even one of those 8 bay device enclosures and cases that are out there
on the market.
Thanks for any help and hints.
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Hello List
am using Xfce : - in /var/log/warn : i see warning
" The gnome keyring socket is not owned with the same credentials as
the user login: /run/user/1000/keyring-4i77r7/control
2013-11-27T13:27:17.434100+02:00 su: gkr-pam: couldn't unlock the login
keyring "
...............
- any ideas how to fix ?
thanks
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On 27/06/17 12:22, Paul Groves wrote:
>
> On 27/06/17 08:34, Aaron Digulla wrote:
>> xmodmap -pke | less
>
> These keycodes do not seem to match the system. For example in the
> output of this command it says:
>
> keycode 158 = XF86WWW NoSymbol XF86WWW
>
> I ran setkeycodes e020 158
>
> When I press the e020 (Internet) button xev says I have pressed code
> 166 (Back button).
>
> How on earth has this happened? I specified 158 not 166. What have I
> done wrong?
>
>
Just been emailed this link:
https://unix.stackexchange.com/questions/49650/how-to-get-keycodes-for-xmod…
To quote this article:
Here you can see keycode 97 is unused on my system:
|keycode 94 = less greater less greater bar brokenbar keycode 95 = F11
XF86Switch_VT_11 F11 XF86Switch_VT_11 keycode 96 = F12 XF86Switch_VT_12
F12 XF86Switch_VT_12 keycode 97 = keycode 98 = Katakana NoSymbol
Katakana keycode 99 = Hiragana NoSymbol Hiragana |
The keycode X uses and the keycode the kernel uses are OFF BY 8 for
"historical reasons". So take 97 - 8 = 89 and use 89 with the
setkeycodes command (again as root):
So to make my vol - button work (xmodmap keycode 122 -8 = 114)
setkeycodes e01e 114
This has worked! I have re-mapped apl the buttons apart from my hotkeys.
>> No but there are lots of uncommon keycodes which you can use. For
>> example, F13-F35 or KP_F1...KP_F4.
>
> In the output of the command xmodmap -pke | less there are no codes
> for F13-F35 or KP_F1 etc
>
> I would like to set HK1 - HK4 to F13 - F16 How do I find the keycodes
> for these buttons
Still looking for the keycodes for F13-16
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All,
I bought a used iSCSI based Drobo in 2016 with 50TB in it. It works
great, but it isn't fast by today's standards. (100 MB/sec absolute
max). And I never got it to work from openSUSE (Windows and Mac did
work).
I now need to buy something similar, but with fast I/O and Linux
support: 10 Gbit Ethernet and fibre-channel may be my only options?
Or are there point-to-point SAS external racks I should consider?
Also, I will likely want to put a SSD based cache in the mix at some
point. It could be integrated into the storage subsystem, or I could
use something like bcache and have the SSD be in the server,. It just
needs to be reliable and fast.
Recommendations? (I'm thinking used and $10K at the high-end for the
subsystem including PCIx cards and switches, if needed.)
== details
I need to buy a server with 50TB usable disk for a production
environment. A high speed disk subsystem is critical. And the project
may scale up over time.
It doesn't need to be a fail-over cluster, just a single server. I'm
looking at used equipment most likely.
I was thinking one with 4 CPU sockets would let me start with 2 CPUs
and then expand to 4 later on. Lots of RAM capacity would also be
great.
My first thought was to get a Dell R920 and throw a bunch of disks in it.
https://goo.gl/images/x3Rfj2
24 disk slots!
But then I looked at what size drives are available for those slots:
2.5 inch. I only see 2TB drives max.
I'm hoping to use a Dell server because it's the preferred brand at my
(new) job. Unless I'm missing something a standalone rack mount Dell
won't work.
So, now I'm looking at a used R820 most likely and some sort of disk
subsystem to support it. I picked it because it is only a 5-year old
design and it has 4 CPU sockets I can expand into as the server demand
increases over time. Also 3TB max ram is way above what this will
require, even long term.
https://media.adn.de/media/DE/DocLib/Poweredge_Easy_Matrix.pdf
A used, barebones R820 can be had for under $2K. Just add CPUs and ram.
Greg
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This is an OpenPGP/MIME signed message (RFC2440, RFC3156).
--=_MIME_CONTENT_BREAK_=_ZVSGRBXMZBOOXUGBRBCHOBMGKKNVGJR_=
Content-Type: text/plain; charset="utf-8"
Content-Disposition: inline; filename="message.txt"
Content-Transfer-Encoding: quoted-printable
Hello group,
I have on several machines this problem: they are continously trying to=20
access the floppy drives. Two drives already defective, due to the=20
mechanic stress.
dmesg shows following continously:
[1537682.559487] sd 0:0:3:0: [sdc] Read Capacity(10) failed: Result:=20
hostbyte=3DDID_OK driverbyte=3DDRIVER_SENSE
[1537682.559496] sd 0:0:3:0: [sdc] Sense Key : Not Ready [current]
[1537682.559498] sd 0:0:3:0: [sdc] Add. Sense: Logical unit not ready,=20
cause not reportable
[1537682.656688] sd 0:0:3:0: [sdc] Spinning up disk...
[1537683.668046]=20
............................................................................=
..................not=20
responding...
[1537783.093938] sd 0:0:3:0: [sdc] Spinning up disk...
[1537784.104049]=20
............................................................................=
..................not=20
responding...
this can't be the wanted behaviour for any removable storage devices?
Any Hints?
Thank you and have a nice weekend
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Hi Folks,
One of my acolytes reported that she used dd to copy one
disk partition to another partition on the same disk, as in:
dd if=/dev/sda1 of=/dev/sda2
She said it failed, but was a little fuzzy about exactly what
happened (I wasn't there), just that the destination partition
appeared to be "empty" after the operation. I don't know
how she made that determination.
I've been doing UNIX stuff for a long time but I never would
have thought to use dd in this fashion. Maybe instinct? But
assuming that the two partitions are exactly the same size,
what could possibly go wrong? I think she was using 42.3,
probably with ext4. Definitely not btrfs, if that matters.
Regards,
Lew
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Hi,
ipv4,
/etc/hosts
127.0.0.1 localhost
127.0.0.2 becherer1.site becherer1
195.167.0.5 becherer1.site becherer1
/etc/postfix/main.cf
myhostname = becherer1.site
inet_protocols = ipv4
on my older systems (opensuse 11.4) i can use:
programm "mailto"
and as address:
simon@becherer1
simon@localhost
simon(a)becherer1.site
simon
all will be delivered correct at the local machine.
if i use the simon@becherer1 or simon(a)becherer1.site or simon
the mail tells me in all cases: send to: simon(a)becherer1.site
if i use simon@localhost the mail tells me: send to: simon(a)localhost.site
i have the same settings like above in the same files in tumbleweed.
(because of newer system, there are much more settings in main.cf)
only send to "simon(a)becherer1.site" and "simon" will pass.
the simon@becherer1 will generate a "undelivered mail return to sender"
host or domain name not found
name service error for
name = becherer1 type=a: host not found
the simon@localhost will generate a "undelivered mail return to sender"
"simon@localhost loopbacks to myself."
sending a "ping" to becherer1 or becherer1.site will return
"from becherer1.site 127.0.0.2" and localhost will return "from localhost 127.0.0.1"
on both machnines identical, so normally the names are set correct?
i guess some other default for postfix may be changed, but i do not find
whats wrong, why did postfix not deliver the mails?
regards,
simoN
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www.becherer.de
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I am unable to get the F1 key to generate anything except a "not
installed on your computer" message. I cannot find either under Yast or
Google where to get the appropriate package to add the help files.
Thanks
Don
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May be you know this already, but Leap 15 is also available as a
wonderful live:
https://download.opensuse.org/distribution/leap/15.0/live/
wonderful, because it's taking all the available room on a usb device.
Yes, it takes all the room of, say, a 16Gb usb pen (preferably usb3), so
all what you do is written, you can even make an update.
great!!
it's a small iso, under 1Gb, and after that it's "overlayed", I guess
some sort of snapshot, and all the rest is written on ext4 partition
seems to even be installable, that is there is an "install" icon on the
desktop (not tested yet)
seems to be a very good solution to my portable install...
thanks all!
jdd
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Is there any way of finding out what prevents a (supposedly idle)
automount from expiring?
I have these 2-3 automounts -
2018-04-29T11:33:31+02:00 newton systemd[1]: srv-mysql.automount: Got automount request for /srv/mysql, triggered by 2347 (cmahostd)
2018-04-29T11:33:31+02:00 newton systemd[1]: srv-www.automount: Got automount request for /srv/www, triggered by 2347 (cmahostd)
2018-04-29T11:33:31+02:00 newton systemd[1]: proc-sys-fs-binfmt_misc.automount: Got automount request for /proc/sys/fs/binfmt_misc, triggered by 2347 (cmahostd)
I was expecting /srv/mysql and /srv/www to expire at some point,
and I don't see either in lsof output.
I don't really mind, but because those mount points are not yet in
use, it made me curious.
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http://www.hostsuisse.com/ - virtual servers, made in Switzerland.
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