similar to: *very* ugly mdadm issue

I'm using Centos 4.5 right now, and I had a RAID 5 array stop because two drives became unavailable. After adjusting the cables on several occasions and shutting down and restarting, I was able to see the drives again. This is when I snatched defeat from the jaws of victory. Please, someone with vast knowledge of how RAID 5 with mdadm works, tell me if I have any chance at all

Everyone, Is there a way to manually assign usb drives to a specified device label. Is there a way to force two usb drives to be labeled as /dev/sdc and /dev/sdd? I decided to build an archive server for the purpose of backing up other fedora/centos desktops at the office. I built a machine and have installed Centos 7.3 on it with all updates current. I also purchased a 3.0 usb sata drive

Somewhere, mdadm is cacheing information. Here is my /etc/mdadm.conf file: more /etc/mdadm.conf # mdadm.conf written out by anaconda DEVICE partitions MAILADDR root ARRAY /dev/md0 level=raid1 num-devices=4 metadata=0.90 UUID=55ff58b2:0abb5bad:42911890:5950dfce ARRAY /dev/md1 level=raid1 num-devices=2 metadata=0.90 UUID=315eaf5c:776c85bd:5fa8189c:68a99382 ARRAY /dev/md2 level=raid1 num-devices=2

I?ve posted this on the forums at https://www.centos.org/forums/viewtopic.php?f=47&t=57926&p=244614#p244614 - posting to the list in the hopes of getting more eyeballs on it. We have a cluster of 23 HP DL380p Gen8 hosts running Kafka. Basic specs: 2x E5-2650 128 GB RAM 12 x 4 TB 7200 RPM SATA drives connected to an HP H220 HBA Dual port 10 GB NIC The drives are configured as one large

I have 4 ST2000DL003-9VT166 (2Tbyte) disks in a RAID 5 array. Because of the size I built them as a GPT partitioned disk. They were originally built on a CentOS 5.x machine but more recently plugged into a CentOS 6.2 machine where they were detected just fine e.g. % parted /dev/sdj print Model: ATA ST2000DL003-9VT1 (scsi) Disk /dev/sdj: 2000GB Sector size (logical/physical): 512B/512B

Hi All Currently i'm setting up a 5.4 server and try to create a 3rd raid device, when i run: $mdadm --create /dev/md2 -v --raid-devices=15 --chunk=32 --level=raid6 /dev/sdc /dev/sdd /dev/sde /dev/sdf /dev/sdg /dev/sdh /dev/sdi /dev/sdj /dev/sdk /dev/sdl /dev/sdm /dev/sdn /dev/sdo /dev/sdp /dev/sdq the device file "md2" is created and the raid is being configured. but somehow

Hey List, So I had a 4 drive software RAID 5 set up consisting of /dev/sdb1, /dev/sdc1, /dev/sdd1 and /dev/sde1. I reinstalled my OS and after the reinstall I made the mistake of re-assembling the array incorrectly by typing "sudo mdadm --assemble /dev/md0 /dev/sdb /dev/sdc /dev/sdd /dev/sde" in a moment of stupidity. Obviously this didn't work and the array wouldn't mount and

Hi all. I have a CentOS server: CentOS release 5.7 (Final) 2.6.18-274.3.1.el5 x86_64 I have two SSD disks attached: smartctl -i /dev/sdc smartctl version 5.38 [x86_64-redhat-linux-gnu] Copyright (C) 2002-8 Bruce Allen Home page is http://smartmontools.sourceforge.net/ === START OF INFORMATION SECTION === Device Model: INTEL SSDSA2CW120G3 Serial Number: CVPR13010957120LGN Firmware

How can I verify the read speed of a btrfs raid0 pair in archlinux.? I assume raid0 means striped activity in a paralleled mode at lease similar to raid0 in mdadm. How can I measure the btrfs read speed since it is copy-on-write which is not the norm in mdadm raid0.? Perhaps I cannot use the same approach in btrfs to determine the performance. Secondly, I see a methodology for raid10 using

Trying to setup a volume group with puppet lvm and this:- volume_group { "my_vg": ensure => present, physical_volumes => "/dev/sdb /dev/sdc /dev/sdd", require => [ Physical_volume["/dev/sdb"], Physical_volume["/dev/sdc"], Physical_volume["/dev/sdd"] ] } Fails with this in the debug

Hi, I have a host which is connected to SAN via single Fibre channel HBA (qlogic). I have several LUNS assigned to this (sdc, sdd). I added another single port HBA to this host. I can now see two world wide names. Now the confusion is which world wide name does sdc and sdd is/was using. scsi_id -g -u -s /block/sdc only gives wwid but I need the wwn for sdc and sdd. Thanks Paras.

Hi I have setup software RAID two years ago using FC3 using the graphical installer (RAID1). In the mean time I installed CENTOS4.5 and everything is running fine. At least that was my perception. It now turns out that raid is not working and that LVS just finds 4 partitions from four disks and that's it.: /dev/sda2 VolGroup00 lvm2 a- 94.88G 0 /dev/sdb1 VolGroup00 lvm2 a-

All of our Kafka clusters are fairly write-heavy. The cluster in question is our second-heaviest ? we haven?t yet upgraded the heaviest, due to the issues we?ve been experiencing in this one. Here is an iostat example from a host within the same cluster, but without the RAID check running: [root at r2k1 ~] # iostat -xdmc 1 10 Linux 3.10.0-327.13.1.el7.x86_64 (r2k1) 05/27/16 _x86_64_ (32 CPU)

> > > I decided to build an archive server for the purpose of backing up > other fedora/centos desktops at the office. I built a machine and have > installed Centos 7.3 on it with all updates current. I also purchased > a 3.0 usb sata drive cabinet (Orico ORICO 9548U3-BK) and installed two > 5T black WD drives. There was no problem installing the usb cabinet > or the

I have a (CentOS4.5) cluster in which the servers mount a GFS partition which is an LVM2 logical volume created as a mirror of two iSCSI- connected drives (with a third for the log). The LV was created using a command along the lines of: lvcreate -m 1 ... /dev/sdb /dev/sdc /dev/sdd where sd[bc] are the mirrored (iSCSI) PVs in the VG and sdd is the log. I have this working and can write data

Hi, I have added 2x2Tb to my existing 2x2Tb raid 1 btrfs filesystem and then ran a balance: # btrfs filesystem show Total devices 4 FS bytes used 1.74TB devid 3 size 1.82TB used 0.00 path /dev/sdd devid 4 size 1.82TB used 0.00 path /dev/sde devid 2 size 1.82TB used 1.75TB path /dev/sdc devid 1 size 1.82TB used 1.75TB path /dev/sdb # btrfs

OK todays problem. I have a HP N54L Microserver running centos 6.5. In this box I have a 3x2TB disk raid 5 array, which I am in the process of extending to a 4x2TB raid 5 array. I've added the new disk --> mdadm --add /dev/md0 /dev/sdb And grown the array --> mdadm --grow /dev/md0 --raid-devices=4 Now the problem the resync speed is v slow, it refuses to rise above 5MB, in general

Hello, I have a weird problem after adding new PV do LMV volume group. It seems the error comes out only during boot time. Please read the story. I have couple of 1U machines. They all have two, four or more Fujitsu-Siemens SAS 2,5" disks, which are bounded in Raid1 pairs with Linux mdadm. First pair of disks has always two arrays (md0, md1). Small md0 is used for booting and the rest - md1

I am running zfs-fuse on an Ubuntu 10.04 box. I have a dual mirrored pool: mirror sdd sde mirror sdf sdg Recently the device names shifted on my box and the devices are now sdc sdd sde and sdf. The pool is of course very unhappy about the mirrors are no longer matched up and one device is "missing". What is the proper procedure to deal with this? -brian -- This message posted from

> -----Original Message----- > From: CentOS [mailto:centos-bounces at centos.org] OnBehalf Of Gregory P. > Ennis > Sent: Sunday, February 19, 2017 12:31 PM > To: centos at centos.org > Subject: Re: [CentOS] usb drives & Orico ORICO9548U3-BK > > > > > > I decided to build an archive server for thepurpose of backing up > > other fedora/centos desktops