search for: jlb17

I run a decent amount of 3ware hardware, all under centos-4. There seems to be some sort of fundamental disagreement between ext3 and 3ware's hardware RAID5 mode that trashes write performance. As a representative example, one current setup is 2 9550SX-12 boards in hardware RAID5 mode (256KB stripe size) with a software RAID0 stripe on top (also 256KB chunks). bonnie++ results look

Hello everybody. I have a problem setting up gluster failover funcionality. Based on manual i setup ucarp which is working well ( tested with ping/ssh etc ) But when i use virtual address for gluster volume mount and i turn off one of nodes machine/gluster will freeze until node is back online. My virtual ip is 3.200 and machine real ip is 3.233 and 3.5. In gluster log i can see: [2011-06-06

On Tue, 22 Nov 2005 11:29:00 -0500 (EST), Joshua Baker-LePain <jlb17 at duke.edu> wrote: > I'm sorry, but making decisions based on Stupid User Tricks is about > the worst policy I can imagine. That way lies madness. No, where lies madness is in the self-centred way in which some people make demands of others to alter innocuous behaviour so that...

Has anyone here benchmarked 64-bit 4.2 against a dual core opteron (or Athlon 64x2) vs a pair of physical single-core opterons? It's that time of year again....ordering new workstations. 8-) Cheers,

Brian Brunner brian.t.brunner at gai-tronics.com (610)796-5838 >>> jlb17 at duke.edu 11/22/05 11:29AM >>> \begin{sotto voce} I can't believe I'm jumping into a thread like this. \end{sotto voce} ***I can. On Tue, 22 Nov 2005 at 10:23am, Les Mikesell wrote > On Tue, 2005-11-22 at 09:52, Bryan J. Smith wrote: >>> Not all mail/news readers t...

From: Joshua Baker-LePain <jlb17 at duke.edu> > I'm in the midst of testing a dual 9500-12 based system, and I've got all > sorts of results (I posted tiobench numbers for XFS and ext3 recently). Until the Escalade 9500S series matures, I've been recommending the following: 3Ware Escalade 7506/8506 for RA...

I'm trying to setup a simple NFSv4 mount between two x86_64 hosts. On the server, I have this in /etc/exports: /export $CLIENT(ro,fsid=0) /export/qb3 $CLIENT(rw,nohide) ON $CLIENT, I mount via: mount -t nfs4 $SERVER:/qb3 /usr/local/sge62/qb3 However: $ touch /usr/local/sge62/qb3/foo touch: cannot touch `/usr/local/sge62/qb3/foo': Read-only file system I'd really

Is anyone using RAID6 in production? In moving from hardware RAID on my dual 3ware 7500-8 based systems to md, I decided I'd like to go with RAID6 (since md is less tolerant of marginal drives than is 3ware). I did some benchmarking and was getting decent speeds with a 128KiB chunksize. So the next step was failure testing. First, I fired off memtest.sh as found at

greetings would someone please point me to an excellent server exercising, stressing, and/or testing program that will run on centos 4? i want one that will not out and out destroy a machine so to speak... ...meaning testing is one thing, yet pounding a box in the hard drive department over and above the cause or unnecessarily does not appeal to me. fyi the box i want to test/stress this time

Dear All, I tried a USB2 Maxtor One touch II external hard disk on a couple of my Centos 4.2 boxes and found it initiallised the SCSI subsystem ok and added device "sda". But the performance is miserable, yet the same hardware running XP the performance is satisfactory. HDPARM gives results varying from 120k/sec to , at its peak 4.75M/s on a USB 2 machine, still very poor by any

We have a server with about 6x750Gb SATA drives setup on a hardware RAID controller. We created hardware RAID 5 on these 6x750GB HDDs. The effective size after RAID 5 implementation is 3.4TB. This server we want to use it as a data backup server. Here is the problem we are stuck with, when we use fdisk -l, we can see the drive specs and its size as 3.4TB. But when we want to create two different

I've been having no end of issues with a 3ware 9650SE-24M8 in a server that's coming on a year old. I've got 24 WDC WD5001ABYS drives (500GB) hooked to it, running as a single RAID6 w/ a hot spare. These issues boil down to the card periodically throwing errors like the following: sd 1:0:0:0: WARNING: (0x06:0x002C): Command (0x8a) timed out, resetting card. Usually when this

I've got an i386 server running centos 4.2 with 3 3ware controllers in it -- an 8006-2 for the system disks and 2 7500-8s. On the 7500s, I'm running an all software RAID50. This morning I came in to find the system hung. Turns out a disk went overnight on one of the 7500s, and rather than a graceful failover I got this: Jan 6 01:03:58 $SERVER kernel: 3w-xxxx: scsi2: Command

First, I am not a RedHat or linux newbie. I simply have not had to do what I am getting ready to do, and I want to see if I am going to run into a problems... My HDA drive is failing (I can hear the occasional click from it and I am seeing Smart errors, the transfer rate is slow but all my data is there). I have 3 partitions on it, the /, /boot/ and my game servers (this is also the drive the

Is there a "proper" way to put in a pause after network initialization to make sure the network *really* is up? I've had this issue for a while with e1000 cards (even on 100MB networks), where the first NFS mount will fail b/c the network reports up but isn't, really. Now, I'm also seeing the same issue on cluster nodes hooked to a switch with jumbo frames enabled. I

I'm looking to buy some new high-reliability servers (mail server, cluster head node). I'll be doing a hardware RAID1 mirror w/ a hot spare, and I'm trying to decide between SCSI and SATA (albeit SATA w/ WD Raptor drives, so the price difference isn't as big as it would seem at first). I'm very familiar with 3ware's monitoring tools for their SATA RAID cards, and they

Is there a way in a kickstart install to affect the order in which modules get loaded? I want to load 3w-xxxx before 3w-9xxx so that my OS mirror drives take their proper place as sda and sdb, but centos-4 wants to load 3x-9xxx first, making my (unbootable) big arrays the first two drives. In this configuration, it seems that even trying to install grub to /dev/sdc fails. Ideas? Thanks.

Back in the day (read: before the latest firefox update), I used to be able to ssh to a remote box, run 'firefox -local', and have that box fire up its own firefox session even if I was running firefox on the system from I which I sshed. Those days seem to be gone. No matter what I try, if I've got firefox running on my local desktop, the remote firefox command just fires off