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Expanding RAID 10 array, WAS: 40TB File System Recommendations
by Emmanuel Noobadmin 15 Apr '11

15 Apr '11

On 4/13/11, Rudi Ahlers <Rudi(a)softdux.com> wrote: >> to expand the array :) > > I haven't had problems doing it this way yet. I finally figured out my mistake creating the raid devices and got a working RAID 0 on two RAID 1 arrays. But I wasn't able to add another RAID 1 component to the array with the error mdadm: add new device failed for /dev/md/mdr1_3 as 2: Invalid argument Googling up this indicates that it's the expected result trying to add a new device to a RAID 0 array. Could you or anybody else please share what's the trick to achieving this?

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CentOS on SSDs...
by John Doe 15 Apr '11

15 Apr '11

Hi, I was just wondering if there are specific steps to take to install CentOS on SSDs... By example, no swap partition? Format with a flash fs? Sysctl parameters? Thx, JD

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speed-tuning samba?
by Les Mikesell 15 Apr '11

15 Apr '11

What's the current state of the art with this black magic? It looks like there are a vast number of tuning options and the ones that typically show up in advice are: socket options = TCP_NODELAY IPTOS_LOWDELAY read raw = yes write raw = yes oplocks = yes max xmit = 65535 dead time = 15 getwd cache = yes some of which may be the defaults anyway. One thing in particular that I'd like to make faster is access to a set of libraries (boost, etc.) that are in a directory mapped by several windows boxes (mostly VM's on different machines)used as build servers. -- Les Mikesell lesmikesell(a)gmail.com

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Xorg
by Michel Donais 15 Apr '11

15 Apr '11

For a few days I can't boot a server in graphical mode. The screen goes black and a have a CUI login. I can login a user and at this point 'startx' get the graphical interface up in /etc/inittab/ x: 5:respawn: /etc.X11/prefdm -nodaemon and xdmcp is alivre On this server we have 12 stations drived by LTSP as a terminal server. We can boot the stations to a point where the X graphical interface doesn't come up and the terminal stays with a grey screen with a big X in the center. Do somebody can drive me to a solution? --- Michel Donais

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Re: [CentOS] 40TB File System Recommendations
by John Jasen 14 Apr '11

14 Apr '11

One was 32 bit, the other 64 bit. Christopher Chan <christopher.chan(a)bradbury.edu.hk> wrote: >On Thursday, April 14, 2011 07:26 AM, John Jasen wrote: >> On 04/12/2011 08:19 PM, Christopher Chan wrote: >>> On Tuesday, April 12, 2011 10:36 PM, John Jasen wrote: >>>> On 04/12/2011 10:21 AM, Boris Epstein wrote: >>>>> On Tue, Apr 12, 2011 at 3:36 AM, Alain Péan >>>>> <alain.pean(a)lpp.polytechnique.fr >>>>> <mailto:alain.pean@lpp.polytechnique.fr>> wrote: >>>> >>>> <snipped: two recommendations for XFS> >>>> >>>> I would chime in with a dis-commendation for XFS. At my previous >>>> employer, two cases involving XFS resulted in irrecoverable data >>>> corruption. These were on RAID systems running from 4 to 20 TB. >>>> >>>> >>> >>> What were those circumstances? Crash? Power outage? What are the >>> components of the RAID systems? >> >> One was a hardware raid over fibre channel, which silently corrupted >> itself. System checked out fine, raid array checked out fine, xfs was >> replaced with ext3, and the system ran without issue. >> >> Second was multiple hardware arrays over linux md raid0, also over fibre >> channel. This was not so silent corruption, as in xfs would detect it >> and lock the filesystem into read-only before it, pardon the pun, truly >> fscked itself. Happened two or three times, before we gave up, split up >> the raid, and went ext3, Again, no issues. > >32-bit kernel by any chance? >_______________________________________________ >CentOS mailing list >CentOS(a)centos.org >http://lists.centos.org/mailman/listinfo/centos

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Re: [CentOS] [OT] ups advice
by Brent L. Bates 14 Apr '11

14 Apr '11

apcupsd doesn't work with new APC UPS's. APC has changed to some proprietary protocol, microlink?, for talking to their UPS's, so apcupsd doesn't work any more or at least not fully. There has been some discussion about this issue on the apcupsd users email list.

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Re: [CentOS] [OT] ups advice
by m.roth＠5-cent.us 14 Apr '11

14 Apr '11

Kevin Thorpe wrote: > On Thu, Apr 14, 2011 at 5:06 PM, admin lewis <adminlewis(a)gmail.com> wrote: >> Hi >> I have a Dell PowerEdge T310 *tower* server.. I have to buy an ups by apc... anyone could help me giving an hint ? >> a simple "smart ups 1000" could be enough ? > > It depends on how long you want it to run. Your choice is a small UPS to give your server just enough time to shut down or a big UPS to allow you to > carry on working for some time. And it depends on what you're trying to deal with: if it's occasional brown or blackouts, or power flickers (let's not talk about Chicago, for example), then you need enough power to provide all it will draw for a couple minutes at most. If you're looking at longer power outages, you'll need something a lot bigger, though one suitable for the above purpose would usually allow it to shut down gracefully; it's not like Linux takes a long, long time to shutdown. <snip> > people have laptops. If you're running big processes on the server then you need long enough to let them complete or shut down gracefully. Heh. Depends on your definition of "big processes", says the guy whose users normally are running jobs that run for *days*, if not weeks. mark

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Re: [CentOS] 40TB File System Recommendations
by m.roth＠5-cent.us 14 Apr '11

14 Apr '11

Lamar Owen wrote: > On Thursday, April 14, 2011 10:37:15 AM Christopher Chan wrote: >> I used XFS extensively when I was running mail server farms for the mail queue filesystem and I only remember one or two incidents when the filesystem was marked read-only for no reason (seemingly - never had the time to find out why) but a reboot fixed those. > > I've had that happen, recently, with ext3 on CentOS 4. I've had that happen, also. It usually indicates a drive dying. mark

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Re: [CentOS] 40TB File System Recommendations
by Lars Hecking 14 Apr '11

14 Apr '11

> OTOH, gparted doesn't see my software raid array either. Gparted it rather > practical for regular plain vanilla partitions, but for more advanced stuff and > filesystems, fdisk is probably better. For filersystems > 2TB, you're better off grabbing a copy of GPT fdisk.

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Re: [CentOS] 40TB File System Recommendations
by Peter Kjellström 14 Apr '11

14 Apr '11

On Thursday, April 14, 2011 04:15:10 PM Sorin Srbu wrote: > >-----Original Message----- > >From: centos-bounces(a)centos.org [mailto:centos-bounces@centos.org] On > >Behalf Of Peter Kjellström > >Sent: Thursday, April 14, 2011 3:31 PM > >To: centos(a)centos.org > >Subject: Re: [CentOS] 40TB File System Recommendations > > > >On Tuesday, April 12, 2011 03:10:33 PM Lars Hecking wrote: > >> > OTOH, gparted doesn't see my software raid array either. Gparted it > >> > rather practical for regular plain vanilla partitions, but for more > >> > advanced stuff and filesystems, fdisk is probably better. > >> > >> For filersystems > 2TB, you're better off grabbing a copy of GPT fdisk. > > > >Even better, use LVM and stay away from partitioning completely. > > Wasn't there some gotchas' regarding LVM's and ext4?? I might be imagining > things things... If you can't find anything better than "I might be imagining things" then maybe, for the sake of singnal to noise, either don't contribute or chase down some additional data first... Then again, the thread is about 40T fs size and ext4 tops out at 16T at the moment so... /Peter

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