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Hello all, I have just configured a 64-bit CentOS 5.5 machine to support an XFS filesystem as specified in the subject line. The filesystem will be used to store an extremely large number of files (in the tens of millions). Due to its extremely large size, would there be any non-standard XFS build/configuration options I should consider? Thanks. Boris. -------------- next part -------------- An

I am trying to generate a set of random numbers that fulfill the following constraints: X1 + X2 + X3 + X4 = 1 aX1 + bX2 + cX3 + dX4 = n where a, b, c, d, and n are known. Any function to do this? Thanks, -Ala' [[alternative HTML version deleted]]

Hello, It is not total off-topic since almost all connected servers will be RHEL and CentOS. :) We are considering to purchase new storage system. The most probably we will be choosing between HP (EVA6000), EMC (CX3-20C) and Hitachi (similar model). iSCSI connection is also required. What are your experienced with listed systems? What to avoid? What ot expect? Now I just know that sequential read/write preformance on EVA is poor. :) Thanks, Mindaugas

I have a simple perl script that every few hours pings the handful of machines on my LAN. Lately I've sometimes been getting ping of 192.168.0.1 succeeded ping of 192.168.0.7 succeeded ping of 192.168.0.5 FAILED ping of 192.168.0.6 succeeded ping of 192.168.0.9 succeeded This machine in question has been running Centos faithfully for about six years and no recent changes to it have been

Should it be possible to hot-swap SATA drives with Centos5? It doesn't seem to work on my system. Removing an unmounted drive locked the system up, and leaving one out at bootup makes the devices change names and keeps grub from finding /boot on a scsi drive that is shifted up. -- Les Mikesell lesmikesell at gmail.com

Hi, over time the requirements and possibilities regarding filesystems changed for our users. currently I'm faced with the question: What might be a good way to provide one big filesystem for a few users which could also be enlarged; backuping the data is not the question. Big in that context is up to couple of 100 TB may be. O.K. I could install one hardware raid with e.g. N big drives

Hi there, have a strange behavior if i?ll create a zfs pool at an EMC PowerPath pseudo device. I can create a pool on emcpower0a but not on emcpower2a zpool core dumps with invalid argument .... ???? Thats my second maschine with powerpath and zfs the first one works fine, even zfs/powerpath and failover ... Is there anybody who has the same failure and a solution ? :) Greets Dominik

...0 [0 ] [root at backup-rdc ~]# lvscan ACTIVE '/dev/vg_opt/lv_backups' [5.86 TB] inherit ACTIVE '/dev/VolGroup00/LogVol00' [37.91 GB] inherit ACTIVE '/dev/VolGroup00/LogVol01' [1.97 GB] inherit ACTIVE '/dev/bak-rdc/cx3-80' [26.37 TB] inherit [root at backup-rdc ~]# It's just beautiful the way I can take another 1.95 TB LUN, add it to the volume group, expand the logical volume, and then expand the underlying filesystem (XFS) and just dynamically add storage. Being on an EMC Clariion foundation, I don...

...00 > Anyone knows how to prevent the kernel from trying to access this lun? > > Regards, > Luis Freitas > > *Daniel <daniel.anderzen@gmail.com>* wrote: > > Hello > > System: Two brand new Dell 1950 servers with dual Intel Quadcore Xeon > connected to an EMC CX3-20 SAN. Running CentOS 5 x86_64 - both with kernel > 2.6.18-8.1.6-el5 x86_64. > > I just noticed a panic on one of the servers: > > Jul 2 04:08:52 megasrv2 kernel: (3568,2):dlm_drop_lockres_ref:2289 ERROR: > while dropping ref on > 87B24E40651A4C7C858EF03ED6F3595F:M00000000000...

...Fri Mar 23 12:52:36 2007 config: NAME STATE READ WRITE CKSUM test ONLINE 0 0 134 /dev/md/dsk/d100 ONLINE 0 0 134 errors: 66 data errors, use ''-v'' for a list bash-3.00# Disks are from Clariion CX3-40 with FC 15K disks using MPxIO (2x 4Gb links). I was changing watermarks for cache on the array and now I wonder - the array or SVM+ZFS? I''m a little bit suspicious about SVM as I can get ~80MB/s only on avarage with short burst upto ~380MB/s (no matter if it''s ZFS, UFS or dir...

Hello everybody, we recently got three Dell PowerEdge servers equipped with Qlogic QLE2462 cards (dual FC 4Gbps ports) and an EMC CLARiiON CX3-40 SAN. The servers with the FC cards were successfully and extensively tested with an older SUN StorEdge T3 SAN. However, when we connect them to the CX3-40, create and mount a new partition and then do something as simple as "tar -C /san -xf ports.tgz" the system panics and deadlocks....

I have trouble finding definitive information about this. I am considering the use of SME 7.5.1 (centOS based) for my server needs, but I do want to use ZFS and I thus far I have only found information about the ZFS-Fuse implementation and unclear hints that there is another way. Phoronix reported that http://kqinfotech.com/ would release some form of ZFS for the kernel but I have found nothing.

The paragraph below is from ZFS admin guide Traditional Volume Management As described in ?ZFS Pooled Storage? on page 18, ZFS eliminates the need for a separate volume manager. ZFS operates on raw devices, so it is possible to create a storage pool comprised of logical volumes, either software or hardware. This configuration is not recommended, as ZFS works best when it uses raw physical

Hello All I have a brand spanking new 40TB Hardware Raid6 array to play around with. I am looking for recommendations for which filesystem to use. I am trying not to break this up into multiple file systems as we are going to use it for backups. Other factors is performance and reliability. CentOS 5.6 array is /dev/sdb So here is what I have tried so far reiserfs is limited to 16TB ext4

On 04/20/2017 05:55 PM, Warren Young wrote: > ... I find that most hardware is ready to fall over by the time the > CentOS that was installed on it drops out of support anyway. > ... James' point isn't the hardware cost, it's the people cost for retraining. In many ways the Fedora treadmill is easier, being that there are many more smaller jumps than the huge leap from C6

We just installed a new cluster with 6 HP DL380g5, dual single port Qlogic 24xx HBAs connected via two HP 4/16 Storageworks switches to a 3Par S400. We are using the 3Par recommended config for the Qlogic driver and device-mapper-multipath giving us 4 paths to the SAN. We do see some SCSI errors where DM-MP is failing a path after get a 0x2000 error from the SAN controller, but the path gets puts