search for: 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.

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...

...I tried something really 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 /dev/gvinum/raid5 /mnt/ mkdir /mnt/aaa...

...e and would really like to preserve them. The timing is ironic. On the day the system failed I was building a new windows machine with a DVD burner to backup my data - all I needed was one more day! Any help would be greatly appreciated. Ron md0: 2 data -disks, max readahead per data-disk: 256 raid5:L device hdf1 operational as raid disk 1 raid5: not enough operational divices for md0 (2/3 failed) RAID5 conf printout: --- rd:3 wd:1 fd:2 disk 0, s:0, o:0, n:0 rd:0 us:1 dev:[dev 00:00] disk 1, s:0, o:0, n:0 rd:0 us:1 dev:hdf1 disk 2, s:0, o:0, n:0 rd:0 us:1 dev:[dev 00:00] raid5: failed to run r...

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...

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...

...size 2.73TB used 1.55TB 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 convert raid level to...

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...

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...

...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...

Hello all! I've got CGYWIN running on an NT4 server, which in turn allows me to run Rsync as a daemon on this system. And might I say, it works most excellently, except for one flaw. It doesn't work on my raid drive(s). I have a 56 gig NTFS RAID5 drive running off an adaptec raid-port controller card. I have two other drives in this system, a 4 gig SCSI boot drive, and 60 gig IDE drive. I can Rsync off the 4 gig SCSI, and 60 gig IDE, but when I try to rsync off the RAID5 setup, the client fails. root@antitrust:/usr/storage/raid5# rsync -...

Hello, ?s there anyway to create raid6 or raid5 level glusterfs installation ? >From docs I undetstood that I can do raid1 base glusterfs installation or radi0 (strapting data too all servers ) and raid10 based solution but raid10 based solution is not cost effective because need too much server. Do you have a plan for keep one or tw...

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] So then I tried t...

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? ___________________________________________________ ??????? ? ???????????????? http://messenger.yahoo.com.tw/

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 | bidwell@andrews.edu Andrews University Information Technology Services If t...

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...

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 list...

...IADOT.ORG encrypt passwords = yes realm = VIRGINIADOT.ORG passdb backend = tdbsam allow trusted domains = no idmap backend = idmap_rid:VIRGINIADOT=2000-100000000 idmap uid = 2000-100000000 idmap gid = 2000-100000000 template shell = /usr/local/bin/bash template homedir = /raid5/home/%U winbind use default domain = yes winbind enum users = no winbind enum groups = no winbind nested groups = yes socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192 local master = no preferred master = no domain logons = no wins server = 10.15.48.3 dns prox...

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 http://ww...

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 opensolaris.org