Re: [GLLUG] Replacement disk in RAID

2023-04-30 Thread Dr. Axel Stammler via GLLUG
On Sun 2023-04-30 08.58.51, Greater London Linux User Group wrote: On 30/04/2023 08:04, Dr. Axel Stammler via GLLUG wrote: RAID 1 ┌ RAID 4 ┌ A    │    └ B ← needs to be replaced    │ RAID 4 ┌ C    └    └ D I'm a bit out of practice with RAID, but how can you have a

Re: [GLLUG] Replacement disk in RAID

2023-04-30 Thread Dr. Axel Stammler via GLLUG
On Sun 2023-04-30 08.53.42, James Dutton wrote: Another thing to consider is something called "Object stores".  This is where the redundancy is handled at the filesystem or above instead of the physical disk. It lets you do things like "Store each file on at least 2 different physical d

[GLLUG] Replacement disk in RAID

2023-04-30 Thread Dr. Axel Stammler via GLLUG
Good morning, one of four hds in my LVM2 raid has stopped reacting to SMART commands or anything else. The 16 TB raid system contains four 8 TB hds in a RAID 1 set of two RAID 4 pairs: RAID 1 ┌ RAID 4 ┌ A │└ B ← needs to be replaced │ RAID 4 ┌ C └└ D So I

[GLLUG] How can I find out if external audio is connected?

2022-09-25 Thread Dr. Axel Stammler via GLLUG
Hi, I would like to remind myself of external amplifiers uselessly running so I would like to play a short sound signal once in a while if there is no audio playing. OTOH, the signal should obviously not be played over the built-in speakers. So, how can I find out (preferably using a command-l

Re: [GLLUG] Link two RAIDs in one LVM?

2020-05-12 Thread Dr. Axel Stammler via GLLUG
Hi, And thanks again, I have followed your advice, creating an 8TB mirrored logical volume on my two new drives, i.e. using 1 mirror = 2 copies. On Mon 2020-05-11 13.15.55, Greater London Linux User Group wrote: Hi, What size are the partitions on the old 8TB disks? Is it a single partition f

Re: [GLLUG] Link two RAIDs in one LVM?

2020-05-12 Thread Dr. Axel Stammler via GLLUG
Hi, On Mon 2020-05-11 22.31.44, James Courtier-Dutton wrote: Which filesystem are you using on the old 8TB disk? For example, if it is btrfs, you don't have to copy anything about. btrfs does its own raid 0. You can just add more disks as you need them and btrfs just uses them. Interesting. I

Re: [GLLUG] Link two RAIDs in one LVM?

2020-05-11 Thread Dr. Axel Stammler via GLLUG
Hi, And thank you for all contributions. On Mon 2020-05-11 19.40.15, Greater London Linux User Group wrote: On Mon, May 11, 2020 at 01:15:55PM +0100, James Courtier-Dutton via GLLUG wrote: If you have a separate data from the OS partition: you could "rsync -avpP" the data/image/picture/what

Re: [GLLUG] Link two RAIDs in one LVM?

2020-05-11 Thread Dr. Axel Stammler via GLLUG
Hi, On Mon 2020-05-11 10.58.13, Greater London Linux User Group wrote: I believe modern mdadm can reshape a RAID-1 into a RAID-0 then a RAID-0 into a RAID-10 and then add extra devices. https://www.berthon.eu/2017/converting-raid1-to-raid10-online/ There will be a scary time when it is RAI

Re: [GLLUG] Link two RAIDs in one LVM?

2020-05-11 Thread Dr. Axel Stammler via GLLUG
Hi, On Mon 2020-05-11 10.02.00, Greater London Linux User Group wrote: On 10/05/2020 21:35, Andy Smith via GLLUG wrote: Hello, On Sun, May 10, 2020 at 10:03:32PM +0200, Dr. Axel Stammler via GLLUG wrote: On Sun 2020-05-10 08.53.16, James Courtier-Dutton wrote: So, I think moving to an &quo

Re: [GLLUG] Link two RAIDs in one LVM?

2020-05-11 Thread Dr. Axel Stammler via GLLUG
Hi, Andy, On Sun 2020-05-10 20.35.20, Greater London Linux User Group wrote: On Sun, May 10, 2020 at 10:03:32PM +0200, Dr. Axel Stammler via GLLUG wrote: On Sun 2020-05-10 08.53.16, James Courtier-Dutton wrote: >So, I think moving to an "LVM mirror" solution is your best be

Re: [GLLUG] Link two RAIDs in one LVM?

2020-05-11 Thread Dr. Axel Stammler via GLLUG
Hi, On Mon 2020-05-11 13.15.55, Greater London Linux User Group wrote: What size are the partitions on the old 8TB disks? Is it a single partition for all 8TB ? Yes, it is. The system is on a separate hard disk drive. If you have a separate data from the OS partition: you could "rsync -avpP

Re: [GLLUG] Link two RAIDs in one LVM?

2020-05-10 Thread Dr. Axel Stammler via GLLUG
On Sun 2020-05-10 08.53.16, James Courtier-Dutton wrote: So, there is a solution that uses tiled RAID. LVM has a "mirror" option. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/4/html/cluster_logical_volume_manager/mirrored_volumes If you used that, you would not need a R

Re: [GLLUG] Link two RAIDs in one LVM?

2020-05-10 Thread Dr. Axel Stammler via GLLUG
Thank you. On Sun 2020-05-10 07.39.31, Greater London Linux User Group wrote: On 09/05/2020 20:32, Dr. Axel Stammler via GLLUG wrote: On Sat 2020-05-09 11.24.15, Greater London Linux User Group wrote: How do you intend to combine them? You won't be able to put your existing array int

Re: [GLLUG] Link two RAIDs in one LVM?

2020-05-09 Thread Dr. Axel Stammler via GLLUG
Hi, Thanks for your quick reaction and your tips. On Sat 2020-05-09 11.24.15, Greater London Linux User Group wrote: How do you intend to combine them? You won't be able to put your existing array into the LVM without destroying its contents. https://www.debian.org/doc/manuals/debian-handboo

Re: [GLLUG] Link two RAIDs in one LVM?

2020-05-09 Thread Dr. Axel Stammler via GLLUG
Hi, Thank you for your detailed look at possible setups. I remembered my old setup incorrectly, though, so that I am not sure everything is applicable. My original (2016) setup included two hard disk drives of not 4 TB but 8 TB capacity in a RAID-1 that has reached 92 per cent capacity. On Tu

Re: [GLLUG] Link two RAIDs in one LVM?

2020-05-02 Thread Dr. Axel Stammler via GLLUG
Hi, On Tue 2020-04-28 16.10.42, Greater London Linux User Group wrote: Next up, if your drives don't support SCTERC timeout facility then this is not ideal for a Linux RAID system but can be worked around Thanks. This is another great tip. Is there any way to find out if a drive has that pro

Re: [GLLUG] Link two RAIDs in one LVM?

2020-05-02 Thread Dr. Axel Stammler via GLLUG
On Tue 2020-04-28 13.19.10, James Courtier-Dutton wrote: First for RAID, avoid SMR HDDs. (Shingled magnetic recording) Hi, Thanks for these valuable tips, especially the one about SMR. I have looked at the topic in more detail and I am really glad I did. Could you suggest a way of finding n

[GLLUG] Link two RAIDs in one LVM?

2020-04-28 Thread Dr. Axel Stammler via GLLUG
Hi, I have a 4 TB RAID system (two identical hard disks combined in a RAID-1, created using mdadm). Now, after a few years, this has reached 90% capacity, and I am thinking about first adding another similar 8 TB RAID system and then combining them into one 12 GB RAID 1+0 filesystem. I should

[GLLUG] XMPP clients? Movim?

2020-01-29 Thread Dr. Axel Stammler via GLLUG
Hi, I have been using different XMPP clients (under Debian and Lineage) over time with rather mixed results, e.g. Gajim, Conversations and A Talk, using my own Prosody setup. Prosody seems to offer a lot, at least in conjunction with A Talk, more than the other clients support, which also seem

Re: [GLLUG] Server in London

2019-10-11 Thread Dr. Axel Stammler via GLLUG
Thank you very much for making me aware of all those options. I have started looking into several of them, which may obviously take a minute or two. OTOH, I feel rather disinclined to work with any but the smallest companies as large companies bring their own agenda which is usually quite differ

Re: [GLLUG] Server in London

2019-10-10 Thread Dr. Axel Stammler via GLLUG
Hello, James, the data is private. The server should only be accessible to me via VPN and SSH. There should be no public access. The internet connection should be provided via ethernet cable; there should be no wireless capability. My core data (authored by myself) is in databases and text file

Re: [GLLUG] Server in London

2019-10-10 Thread Dr. Axel Stammler via GLLUG
Hello, David, Thanks for your quick reply. My internet connection is slow and unreliable, and my power supply has (on rare occasions) failed, too. Part of the server would be devoted to database replication. I don't want to work with any cloud systems offered by big companies. And, in a pinch