similar to: Generic RAID question

So on a virtual server the root password was no longer working (as in I couldn't ssh in anymore). Only I and one other know it and neither of us have changed it. No other account had the correct privileges to correct this so I'm wondering, if I had mounted that vdi as a secondary device on another VM, browsed the file system and delete /etc/shadow would this have wiped all users passwords

I have some questions on how I can perform the following actions from the terminal in CentOS 5.5 final. My Google searches aren't helping and I keep seeing references to the command 'useradd' but this isn't present on my box; -How to add a new user? $ useradd -bash: useradd: command not found (This is the same for my normal user and when logged in as root) -How to set/change an

Listee's... I have a 5.5 box and I have formatted a partition as ext4 however I can't mount it, the mount command is telling me its an unknown file system type. fsck tells me the partition is a clean ext4 partition but I can't mount it. Some reasearch has lead me to believe the problem is that ext4 isn't enabled in the kernel by default in 5.5 (this was originally a 5.2 box that

I'm stuck trying to work this one out and my Google skills are apparently lacking today. This is a test bash script; #!/bin/bash do something | tee a.log if [ $? -ne 0]; then echo broken fi The problem with this script is $? contains the exit value of the tee command, but I want to check the exit value of whatever command I put in place of 'do something'. How can I achieve this

Hi List, We have a CentOS VPS running a web site in a DC far away. The chap that dev's this site told me he couldn't SFTP in yesterday, his password was being rejected (I went to his desk to confirm and saw it was telling him the password was incorrect but neither him nor me had changed it and we are the only two with access to this VPS). So I logged in as root and reset his password, be

Hi List, I suppose this isn't strictly CentOS but I'm talking about some 5.5 servers so I thought someone else here may have had the same issues; We power on servers at night via IPMI and shut them down the same way for automation. The problem I'm facing is that the servers are shutdown in about 2 seconds. IPMI provides remote access to the power features as we know so I don't

Greetings- I'm about to embark on a new installation of Centos 6 x64 on 4x SATA HDDs. The plan is to use RAID-10 as a nice combo between data security (RAID1) and speed (RAID0). However, I'm finding either a lack of raw information on the topic, or I'm having a mental issue preventing the osmosis of the implementation into my brain. Option #1: My understanding of RAID10 using 4

On 4/13/11, Rudi Ahlers <Rudi at 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:

Hi List :) So, I have a folder1, its owner is user1 who has r+w on the folder. User2 is the group owner who only has read access (when I say user2, I mean the group called user2, because when you make a new user the OS can make them their own group). You can see these permissions below: [user2 at host test]$ ls -l drw-r----- 3 user1 user2 28 Nov 2 16:17 folder1 How ever user2 can not

Hi, I do have a disk array that is providing striped LUNs to my Solaris box. Hence I''d like to simply concat those LUNs without adding another layer of striping. Is this possibile with ZFS? As far as I understood, if I use zpool create myPool lun-1 lun-2 ... lun-n I will get a RAID0 striping where each data block is split across all "n" LUNs. If that''s

Hi All, I am looking at ZFS and I get that they call it RAIDZ which is similar to RAID 5, but what about RAID 10? Isn''t a RAID 10 setup better for data protection? So if I have 8 x 1.5tb drives, wouldn''t I: - mirror drive 1 and 5 - mirror drive 2 and 6 - mirror drive 3 and 7 - mirror drive 4 and 8 Then stripe 1,2,3,4 Then stripe 5,6,7,8 How does one do this with ZFS?

> On Nov 4, 2020, at 9:21 PM, John Pierce <jhn.pierce at gmail.com> wrote: > > is it RAID 0 (striped) or raid1 (mirrored) ?? > > if you wrote on half of a raid0 stripe set, you basically trashed it. > blocks are striped across both drives, so like 16k on the first disk, then > 16k on the 2nd then 16k back on the first, repeat (replace 16k with > whatever your raid

Hey List, How do people measure how many listeners they can have on a single NIC card? A 1Gig Ethernet NIC card maybe able in terms of bandwidth to serve 31,250 listeners at 32Kbps (not including overheads etc, just a flat calculation) but there is no way the NIC card its self could handle 31k concurrent connections to 31k different IPs on 31K ports? (Obviously the OS comes into play here a bit

So I have been playing with a RAID 10 f2 ( 2 disks far layout) setup...thanks for all of the advice..Now I am playing with the format and want to make sure I have it setup the best that I can, my raid was built using the raid 10 option with 2 disks with the layout=far, chunk size 512....now I read all of the docs I could find about format and stride and stripe size and this is what i came up

I cannot verify it, but I think that even JBOD is propagated as a virtual device. If you create JBOD from 3 different disks, low level parameters may differ. And probably old firmware is the reason we used RAID-0 two or three years before. Thank you for the ideas. Kind regards Milo Dne 10.09.2020 v 16:15 Scott Q. napsal(a): > Actually there is, filesystems like ZFS/BTRFS prefer to see

On 10/25/2016 11:54 AM, Gordon Messmer wrote: > If you built a RAID0 array of RAID6 arrays, then you'd fail a disk by > marking it failed and removing it from whichever RAID6 array it was a > member of, in the same fashion as you'd remove it from any other array > type. FWIW, what I've done in the past is build the raid 6's with mdraid, then use LVM to stripe them

The stripe and stride options do two things: - shift block and inode bitmaps in each group to be on different disks - align the block allocation to the stripe and stride boundaries to avoid read-modify-write in RAID The first one is irrelevant if the flex_bg option is used, since it already packs the bitmaps together and achieves the same effect. The second is meaningless for RAID-1 since

Hi there, I have a system with the following: # fdisk -l Disk /dev/sda: 80.0 GB, 80000000000 bytes 255 heads, 63 sectors/track, 9726 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 9471 75971385 83 Linux /dev/sda3

I remember seeing one with an example migrating from an old fashioned filesystem on a partition to a new filesystem on a mirrored lvm logical volume but one only one side of the mirror is set up at this time. First I need to copy stuff from what will become the second side of the mirror to filesystem on the first side or the mirror Then I will be ready to follow the rest of the tutorial and

Andreas, why is it relevant only in case of RAID5 or RAID6? regards, Martin On Fri, Mar 7, 2014 at 5:57 PM, Andreas Dilger <adilger@dilger.ca> wrote: > Note that stride and stripe width only make sense for RAI-5/6 arrays. > For RAID-1 it doesn't really matter. > > Cheers, Andreas > >> On Mar 6, 2014, at 13:46, Martin T <m4rtntns@gmail.com> wrote: >>