search for: raid5

Displaying 20 results from an estimated 595 matches for "raid5".

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2009 Sep 24
OT: What's wrong with RAID5
...he docs it says that it only supports either RAID-DP or RAID4. What I want to achieve is Max Storage Capacity, so I change it from RAID-DP to RAID4, but with RAID4, the maximum disk in a RAID Group decrease from 14 to 7. In the end, either using RAID-DP or RAID4, the capacity is the same. Now, why RAID5 is not supported? I believe using RAID5, I can get more storage capacity, can't I? I also notice with some onboard RAID controller, they only support either RAID0, RAID1, or RAID1+0. No RAID5. What's wrong with RAID5, is there any technical limitation with RAID5? Thanks.
2008 May 22
RAID5 or RAID50 for database?
we have DELL 6800 server with 12 internal disks in it. O.S. is CENTOS 4.6 and SCSI control card is PERC 4e/di. We plan to configure 4 disks (5,8,9,10) as RAID5 or RAID50. This logical volume will be use as file systems and store database backup files. Can anyone tell me which one is better on performance? Thanks. ?????????Yahoo!??????2.0????????????? - ????? -------------- next part -------------- An HTML attachment was scrubbed... URL: <htt...
2006 Mar 02
Panics with md/gvinum/ufs
...y simple. Steps to reproduce: 1) dd if=/dev/zero of=a bs=1024 count=256000 dd if=/dev/zero of=b bs=1024 count=256000 dd if=/dev/zero of=c bs=1024 count=256000 2) mdconfig -a -t vnode -u 0 -f a mdconfig -a -t vnode -u 1 -f b mdconfig -a -t vnode -u 2 -f c 3) gvinum create raid5.conf with raid5.conf: drive a device /dev/md0 drive b device /dev/md1 drive c device /dev/md2 volume raid5 plex org raid5 491k sd length 0 drive a sd length 0 drive b sd length 0 drive c 4) newfs -m 0 /dev/raid5 5) mount /de...
2009 Sep 25
SATA vs RAID5 vs VMware
Hello, I have strange behaviour on a server that I can't get a handle on. I have a reasonably powerful server running VMware server 1.0.4-56528. It has a RAID5 build with mdadm on 5 SATA drives. Masses of ram and 2 XEON CPUs. But it stutters. Example : fire up vi, press and keep finger on i. After filling 2-3 lines, the display is stopped for 2-12 seconds. Then they continue. This happens even on the host OS, at the console. Host system running C...
2013 May 10
Btrfs balance invalid argument error
...path /dev/sdc devid 3 size 2.73TB used 0.00 path /dev/sdb Btrfs v0.20-rc1-253-g7854c8b # btrfs fi df /mnt/data Data: total=3.79TB, used=3.79TB System: total=4.00MB, used=420.00KB Metadata: total=6.01GB, used=4.87GB When running # btrfs balance start -dconvert=raid5 -mconvert=raid5 /mnt/data I get ERROR: error during balancing ''/mnt/data'' - Invalid argument There may be more info in syslog - try dmesg | tail dmesg | tail says: btrfs: unable to start balance with target data profile 128 Isn''t it possible to conver...
2013 Aug 29
I made a btrfs on five disks using RAID5 (-d raid5 for mount option). When a power failure occurs, I can not remount btrfs after my system reboots. Dmesg for remount is presented as following: [ 192.713953] bio: create slab <bio-1> at 1 [ 192.716230] Btrfs loaded [ 192.717177] device fsid a0dff7ea-9354-43fd-8516-0e17f370991d de...
2004 Jul 30
Large File Copy to Large ext3 RAID5 Array Often Stalls
I'm experiencing strange behavior from my ext3 RAID5 array and my Fedora Core 2 system. Before I go crazy varying all sorts of tuning parameters, I thought some list subscribers might provide me with useful advice. The problematic array is: 3x Promise Technology Ultra 100 TX2 PCI cards 6x Maxtor 250GB IDE drives (one drive per cable) RAID level 5...
2007 May 01
Raid5 issues
So when I couldn't get the raid10 to work, I decided to do raid5. Everything installed and looked good. I left it overnight to rebuild the array, and when I came in this morning, everything was frozen. Upon reboot, it said that 2 of the 4 devices for the raid5 array failed. Luckily, I didn't have any data on it, but how do I know that the same thing...
2005 Jul 07
raid5 crash
...eds with both the normal kernel-2.6.9-11.EL and kernel-2.6.9-11.106.unsupported. after we change the motherboard, the raid contorller and the cables too we still got it. finally we start netdump and last but not least yesterday we got a crash log and a core file. it seems there is a bug in the raid5 code of the kernel. this is our backup server with 8 x 200GB hdd in a raid5 (for the data) plus 2 x 40GB hdd in raid1 (for the system) with 3ware 8xxx raid contorller, running. i attached the netdump log of the last crash. how can i fix it? yours. -- Levente &qu...
2013 Aug 16
4 vol raid5 segfault on device delete
I have a 4 device volume with raid5 - trying to remove one of the devices (plenty of free space) and I get an almost immediate segfault. Scrub shows no errors, repair show space cache invalid but nothing else (I remounted with clear cache to be safe). Lots of corrupt on bdev (for 3 out of 4 drives), but I have no file access issues...
2009 May 25
raid5 or raid6 level cluster
Hello, ?s there anyway to create raid6 or raid5 level glusterfs installation ?
2001 Nov 07
Ext3, Raid5, and Quotas on 2.4.14?
I remember that there used to be a problem with disk quotas on Ext3 and Raid5 on the 2.4.x kernel series. I am running 2.4.14 with Ext3 and Raid5 and am having problems with quotas and am wondering if I have something misconfigured or if this combination doesn't work yet. -- Daniel R. Bidwell | Andrews University Information Technology Services If t...
2008 Aug 22
Growing RAID5 on CentOS 4.6
I have 4 disks in a RAID5 array. I want to add a 5th. So I did mdadm --add /dev/md3 /dev/sde1 This worked but, as expected, the disk isn't being used in the raid5 array. md3 : active raid5 sde1[4] sdd4[3] sdc3[2] sdb2[1] sda1[0] 2930279808 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU...
2009 Aug 18
OT: RAID5, RAID50 and RAID60 performance??
We have several DELL servers with MD1000 connect to it. Server will install CENTOS 5.x X86_64 version. My questions are: 1. Which configuration have better performance RAID5, RAID50 or RAID60? 2. how much performance difference? ___________________________________________________ ??????? ? ????????????????
2011 Nov 23
stripe alignment consideration for btrfs on RAID5
Hiya, is there any recommendation out there to setup a btrfs FS on top of hardware or software raid5 or raid6 wrt stripe/stride alignment? From mkfs.btrfs, it doesn''t look like there''s much that can be adjusted that would help, and what I''m asking might not even make sense for btrfs but I thought I''d just ask. Thanks, Stephane -- To unsubscribe from this...
2010 Jul 20
zfs raidz1 and traditional raid 5 perfomrance comparision
Hi, for zfs raidz1, I know for random io, iops of a raidz1 vdev eqaul to one physical disk iops, since raidz1 is like raid5 , so is raid5 has same performance like raidz1? ie. random iops equal to one physical disk''s ipos. Regards Victor -- This message posted from
2011 Aug 17
RAID5 suddenly broken
Hello, I have a RAID5 array on my CentOS 5.6 x86_64 workstation which "suddenly" failed to work (actually after the system could not resume from a suspend). I had recently issues after moving the workstation to another office, where one of the disks got accidently unplugged. But the RAID was working and it ha...
2005 Aug 29
RAID5 - MBR and default grub config on CentOS 4
greetings, i just know i have read several times on this list and in other places that on a RAID5 array that the MBR should be placed on the /boot partition. is this truly correct and if so, why? my experiences of putting the MBR on the /boot partition are contrary to that it will even work and boot that way... comments please? regards, - rh -- Robert Hanson Abba Communications h...
2012 Sep 16
Setting up XEN domU causes RAID5 to fail?
...a new XEN system for myself for work purposes. I support several different versions of a software that cannot be installed at the same time, so I decided I wanted to setup a XEN domU for each. I had 5 spare 500GB drives so I put them in my system and partitioned them so I have a RAID1 boot, a RAID5 root and a RAID5 images. I got linux (Funtoo) installed on the root with my kernel on the boot. XEN is installed as well and setup and running. I created a xen_images folder and a iso _images folder both in the /images folder. I downloaded the ISO''s for the OS''s I need to i...
2003 Dec 17
Ext3 on RAID5 for video archive server
I am using a terabyte RAID5 with ext3 and created using mdadm, to store jpeg files on a rehdat 7.3 system. I need to write files to the RAID5 at the rate of 800 files per second, and each file is about 10-20 KB in size. I have tried using data-writeback and the noatime options while mounting, and I am also using a stipe-s...