similar to: Upgrading system from non-RAID to RAID1

> On 01/11/2023 01:33 PM, H wrote: >> On 01/11/2023 02:09 AM, Simon Matter wrote: >>> What I usually do is this: "cut" the large disk into several pieces of >>> equal size and create individual RAID1 arrays. Then add them as LVM PVs >>> to >>> one large VG. The advantage is that with one error on one disk, you >>> wont >>>

On 01/11/2023 01:33 PM, H wrote: > On 01/11/2023 02:09 AM, Simon Matter wrote: >> What I usually do is this: "cut" the large disk into several pieces of >> equal size and create individual RAID1 arrays. Then add them as LVM PVs to >> one large VG. The advantage is that with one error on one disk, you wont >> lose redundancy on the whole RAID mirror but only on

> Follow-up question: Is my proposed strategy below correct: > - Make a copy of all existing directories and files on the current disk using clonezilla. > - Install the new M.2 SSDs. > - Partitioning the new SSDs for RAID1 using an external tool. > - Doing a minimal installation of C7 and mdraid. > - If choosing three RAID partitions, one for /boot, one for /boot/efi and the

On 01/11/2023 02:09 AM, Simon Matter wrote: > What I usually do is this: "cut" the large disk into several pieces of > equal size and create individual RAID1 arrays. Then add them as LVM PVs to > one large VG. The advantage is that with one error on one disk, you wont > lose redundancy on the whole RAID mirror but only on a partial segment. > You can even lose another

On 04/23/2022 09:19 PM, H wrote: > On 04/19/2022 09:57 AM, Roberto Ragusa wrote: >> On 4/18/22 1:27 PM, H wrote: >>> I have a new computer with 2 x 2TB SSDs where I wanted to install C7 and use mdadm for RAID1 configuration and encrypting the /home partition. On the net I found https://tuxfixer.com/centos-7-installation-with-lvm-raid-1-mirroring/ which I adopted slightly with

I have a new computer with 2 x 2TB SSDs where I wanted to install C7 and use mdadm for RAID1 configuration and encrypting the /home partition. On the net I found https://tuxfixer.com/centos-7-installation-with-lvm-raid-1-mirroring/ which I adopted slightly with respect to partition sizes, using RAID1 for /boot and /root as well and added the /home partition with RAID1 and chose to have /home

On 11/04/2020 10:21 PM, John Pierce 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 stripe size is). > > if its a raid 1

My computer running CentOS 7 is configured to use BIOS RAID0 and has two identical SSDs which are also encrypted. I had a crash the other day and due to a bug in the operating system update, I am unable to boot the system in RAID mode since dracut does not recognize the disks in grub. After modifying the grub command line I am able to boot the system from one of the harddisks after entering the

> 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

On 9/17/20 4:25 PM, Phil Perry wrote: > On 17/09/2020 13:35, Michael Schumacher wrote: >> Hello Phil, >> >> Wednesday, September 16, 2020, 7:40:24 PM, you wrote: >> >> PP> You can achieve this with a hybrid RAID1 by mixing SSDs and HDDs, and >> PP> marking the HDD members as --write-mostly, meaning most of the reads >> PP> will come from the

On Thu, 2014-12-04 at 16:46 -0800, Gordon Messmer wrote: > On 12/04/2014 05:45 AM, David McGuffey wrote: > In practice, however, there's a bunch of information you didn't provide, > so some of those steps are wrong. > > I'm not sure what dm-0, dm-2 and dm-3 are, but they're indicated in your > mdstat. I'm guessing that you made partitions, and then made

Hello Phil, Wednesday, September 16, 2020, 7:40:24 PM, you wrote: PP> You can achieve this with a hybrid RAID1 by mixing SSDs and HDDs, and PP> marking the HDD members as --write-mostly, meaning most of the reads PP> will come from the faster SSDs retaining much of the speed advantage, PP> but you have the redundancy of both SSDs and HDDs in the array. PP> Read performance is

Hey, anyone using an LSI MegaRAID experienced "disappearing drives"...? We installed 6 new C6 servers, each with a Supermicro SMC2108 (LSI MegaRAID) controllers and 3 PX-128M5Pro SSDs ( RAID1 + hostswap). 2 weeks (and almost no activity on it, since not in production, apart from installation) later, megacli sees (based on the slot numbers): - on one server: only the 2nd disk of the RAID

Hello all, I have a DL360 G4 1U server that does a wonderfull job with dovecot horde, Xmail and OpenLDAP for a company and serving about 40 acouunts. The machine is wonderful. I am very happy with it. However, I am running out of disk space. It has two times 76Gb Drives in RAID1 (disk mirroring) and the capacity has reached 82%.? I am starting of getting nervous. Does anyone know of a painless

Hi, I encounter a problem with Syslinux 5.00 I cannot really describe. So I created two small videos: Booting with Syslinux 5.00 (1.3 MB): <https://www.dropbox.com/s/b6g8cdf2t9v48c6/boot-syslinux5-fail.mp4> How I fixed the problem by downgrading to Syslinux 4.06 and how booting should look like (6.5 MB): <https://www.dropbox.com/s/lt7cpgfm0qvqtba/boot-syslinux5-how-i-fixed-it.mp4>

I have this ASUS M2NBP-VM motherboard http://tinyurl.com/3xby3h running CentOS 4.4 as a web/email server. It has a 500Gb SATA2 drive with about 32Gb in use. The motherboard supports hardware raid. Is there a way to switch to RAID1 without reinstalling or loosing any data? Also, if I am running raid how do I know if there is a failure on one of the drives anyway? Is hardware RAID1 a good idea?

Hi, I just found myself having to set up a new CentOS 6 system with a nearly identical configuration to an existing host, so I thought I would just 1. Do a minimal install to set up partitions etc. on the new system. 2. Create an image of the existing system using Clonezilla (http://www.clonezilla.org) 3. Run a Clonezilla restore on the new system. - as I though it would be a lot

Stephen John Smoogen wrote: > On 13 September 2017 at 09:25, hw <hw at gc-24.de> wrote: >> John R Pierce wrote: >>> >>> On 9/9/2017 9:47 AM, hw wrote: >>>> >>>> >>>> Isn?t it easier for SSDs to write small chunks of data at a time? >>>> The small chunk might fit into some free space more easily than >>>> a

Hi all, I was recently charged with configuring a new fairly large (24x3TB disks) fileserver for my group. I think I know mostly what I want to do with it, but I did have two questions, at least one of which is directly related to CentOS. 1) The controller node has two 90GB SSDs that I plan to use as a bootable RAID1 system disk. What is the preferred method for laying out the RAID array? I

Hi list, I'm building a NFS server on top of CentOS 8. It has 8 x 8 TB HDDs and 2 x 500GB SSDs. The spinning drives are in a RAID-6 array. They are 4K sector size. The SSDs are in RAID-1 array and with a 512bytes sector size. I want to use the SSDs as a cache using dm-cache. So here what I've done so far: /dev/sdb ==> SSD raid1 array /dev/sdd ==> spinning raid6 array I've