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Re: LSI megaraid recovery
by Phil Ashby 17 Jun '24

17 Jun '24

On 15/06/2024 12:00, Laurie Brown <laurie(a)brownowl.com> wrote: > ... > Disk /dev/mapper/ddf1_RAID10: 931 GiB, 999653638144 bytes, > 1952448512 sectors > > Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): > 512 bytes / 512 bytes > ... > Device Boot Start End Sectors Size Id Type > /dev/mapper/ddf1_RAID10-part1 1 4294967295 4294967295 2T ee GPT > ... > So it has a partition - but I can't find a way to mount it.> > mount /dev/mapper/ddf1_RAID10-part1 /mnt/test mount: /mnt/test: > special device /dev/mapper/ddf1_RAID10-part1 does not exist. Hi Laurie, I'd guess that whatever distro you are running doesn't like the GPT partition format, so hasn't created the device file(s) for each partition. I'd go for the simple option of creating a loopback device using the sector size & offsets in the partition table: # losetup -o 512 -b 512 -f /dev/mapper/ddf1_RAID0 This should make you a new /dev/loop<n> that avoids existing ones (probably your USB boot stick), which you can mount as NTFS or whatever. If losetup doesn't like having a block device underneath, then more messing with dmsetup should be able to achieve the same (but I've never done that...) Good luck, Phil. PS: Did you check in /dev/disk/... for those partitions?

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LSI megaraid recovery
by Laurie Brown 14 Jun '24

14 Jun '24

I'm at my wits' end on this one, folks, and I could do with some help please. This is all for a customer who is desperate to get this data back... I have an LSI RAID card (Broadcom MegaRAID SAS 9341-4) which has suddenly stopped working. I've been to hell and back trying to get a couple of newer machines to recognise the card and let me near the BIOS. In fact, this card has been working as a 4-disc RAID10 array for more than a year in a 'Doze 11 machine but just stopped a couple of weeks ago. I bought a new card, a different mobo, new cables, the lot. Nothing. The customer shipped me the original machine so I have access to all that was there before. I eventually found an older (Ubuntu) machine in my junk pile in which the PCIe slot let me into the BIOS so I recovered the RAID array, but the megaraid_sas driver in Ubuntu refused to work, so I couldn't access the data. I won't go into the pain involved in getting to this point, but it was extreme and lengthy! I have finally given up on the card, and dropped the 4 drives straight into an Ubuntu box, where I'm trying to get to the data. What I have now is the four disks all seen by the system, and a /dev/mapper device which is the RAID array. ---- cut here ---- # blkid /dev/sda: UUID="LSI ^P" TYPE="ddf_raid_member" /dev/sdb: UUID="LSI ^P" TYPE="ddf_raid_member" /dev/sdc: UUID="LSI ^P" TYPE="ddf_raid_member" /dev/sdd: UUID="LSI ^P" TYPE="ddf_raid_member" /dev/sde1: LABEL_FATBOOT="Windows USB" LABEL="Windows USB" UUID="8B53-C0AB" BLOCK_SIZE="512" TYPE="vfat" PARTUUID="a85d43c9-01" /dev/loop0: TYPE="squashfs" /dev/mapper/ddf1_RAID10: PTTYPE="PMBR" ---- cut here ---- /sde1 is the USB stick I booted from. fdisk -l gives me 2 mapper devices: ---- cut here ---- Disk /dev/mapper/ddf1_RAID10: 931 GiB, 999653638144 bytes, 1952448512 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x00000000 Device Boot Start End Sectors Size Id Type /dev/mapper/ddf1_RAID10-part1 1 4294967295 4294967295 2T ee GPT ---- cut here ---- fdisk on the mapper devices says this: ---- cut here ---- Disk /dev/mapper/ddf1_RAID10: 931 GiB, 999653638144 bytes, 1952448512 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x00000000 Device Boot Start End Sectors Size Id Type /dev/mapper/ddf1_RAID10-part1 1 4294967295 4294967295 2T ee GPT ---- cut here ---- So it has a partition - but I can't find a way to mount it. mount /dev/mapper/ddf1_RAID10-part1 /mnt/test mount: /mnt/test: special device /dev/mapper/ddf1_RAID10-part1 does not exist. ---- cut here ---- ---- cut here ---- mdadm --examine /dev/mapper/ddf1_RAID10 /dev/mapper/ddf1_RAID10: MBR Magic : aa55 Partition[0] : 4294967295 sectors at 1 (type ee) ---- cut here ---- Any help appreciated! Cheers, Laurie. -- --------------------------------------------------------------------- Laurie Brown laurie(a)brownowl.com ---------------------------------------------------------------------

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VPN options
by Mark Rogers 13 Jun '24

13 Jun '24

The scenario: Two individuals both with fast home Internet connections, plus an office on a pretty basic VDSL connection. All three have distinct subnets. Routers in all three locations have VPN support. The home ones support OpenVPN and Wireguard, the office OpenVPN only, but I'd consider replacing the router if it gave us what we needed. Objective: I want to link all three locations so that IPs on each network can be reached from the others, but in a configurable way. Ie neither individuals home devices should be accessible to the other individual (albeit they may use the VPN themselves to access them personally). Some office-based resources may not be shared. Etc. How can I do this? I'm assuming I'll get a cheap VPS somewhere to act as VPN server and have all three routers connect to that, and after that it's "just" a question of managing access and routing. But I need the result to be maintainable and ideally not just by me, which would mean either some kind of GUI or some really simple commandline tools. When I started looking at this I figured there'd be some simple appliance-type applications I could install on the VPS that would do this but I've come up short so far. I don't have any real budget for this - I'm OK with a few quid a month on a VPS and likewise on a subscription service if I have to go down that route (I'd rather not). (We do already have an office dial-in VPN option which could be used on the routers but I don't think putting all our domestic devices into one bit VPN is a good idea for all sorts of security reasons.) -- Mark Rogers

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Re: KVM shared folders (Mark Rogers)
by peter.northerly＠gmail.com 03 Jun '24

03 Jun '24

I am finding this a very useful point of research for these kinds of question. Not always right, but it mostly gets you there if you persist. https://www.perplexity.ai/search/how-to-set-rxsxMNWDRjeuwX3WssHVRQ

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KVM shared folders
by Mark Rogers 30 May '24

30 May '24

I'm trying to migrate away from VirtualBox. One feature I use a lot in VBox is shared folders, ie making a directory on the host (Ubuntu) appear as a mapped drive on the VM (Windows). This is close enough to trivial in VBox but I've never quite made sense of how to do it in KVM, so I'm hoping someone here can advise? -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0344 251 1450 Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER

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Re: NAS
by Srdjan Todorovic 14 May '24

14 May '24

On Mon, 13 May 2024 at 16:42, <steve-ALUG(a)hst.me.uk> wrote: > On 09/05/2024 22:01, Srdjan Todorovic wrote: > And also this particular evening, I am battling a dead NVME drive > (with lots and lots of important files I've not yet had a chance to > backup to my NAS) which means I also cannot boot my desktop, even with > a Kubuntu Live DVD. So it's a poignant reminder to have a backup and > have something that is redundant as well in case of hardware failure > or bit-rot. :( > Ouch. Hope you made progress with this. I pulled the NVME out of the desktop and put it in my laptop, thinking I can just mount it and get the files. However my desktop OS booted up on my laptop - looks like NVME is fine, and the motherboard has something wrong with it. Ended up replacing the motherboard, which was a world of pain (long story, wifi, kubuntu upgrades, display, dnsmasq). I do need to organise my files and make sure they are on my NAS. Best, Srdj

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NAS
by steve-ALUG＠hst.me.uk 13 May '24

13 May '24

OK, so in my quest to simplify things, I'm going to eventually do-away with my server. Can anyone recommend a NAS? Old me would probably have rolled-my-own with FreeNas or similar, but perhaps I need to go "of-the-shelf". Should I get RAID, or not bother? My fileserver is RAIDed (mirrored). Any thoughts? Cheers Steve

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Mail Woes - new provider needed.
by steve-ALUG＠hst.me.uk 24 Apr '24

24 Apr '24

Posted Midday Friday 12/4/24 I'm not sure if my previous post yesterday about mail problems will get posted on the group or not. This supersedes it. Yesterday I became aware that I couldn't send outgoing email. I run my own mailserver, and it seems that due to my email addresses being harvested and used in spam, my mailserver's IP address had been blacklisted, so I couldn't send email. After emailing my ISP and one of the websites that had me listed, I find I can send email again. This is good. But being able to send email is quite important to me (!), so being unable to do has increased the need to migrate away from my own mail server soon. So - where to go? What do I do/need? I have taken advantage of my mailserver's forwarding, so that I can have email addresses like user-suffix@mydomain will all route to user@mydomain, no matter what suffix. I have no idea of what suffixes I have used over the years. :-( I'd like to be able to continue that, but if not, it shouldn't reject user-randomsuffix@mydomain and instead route it to a default recipient. Hopefully! 3 main users. For 2 I'd probably like to do a blanket redirect to other email addresses that they mainly use now. e.g. user2@mydomain, and user2-anysuffix@mydomain redirect to user2@gmail I can probably move the whole domain to a new provider. I don't have a website or FTP. I use VPN to remote in to it, to access machines, but I can probably hack that with a dynamic DNS. So it's mainly email. Any thoughts please? Steve

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Pruning online inbox to store on laptop
by Bev Nicolson 16 Apr '24

16 Apr '24

I finally decided to start using Betterbird a while ago. Given the way two of my accounts are set up (storage on my ISP's servers is limited) I need to prune them. I'd like to store the emails on my laptop but none of Betterbird's menu options make it clear how to do that. Are the local folder folders just for offline storage or what? (I have googled. It didn't help.) I'm sure this is a very basic question but all help gratefully received. Bev

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Kubuntu hard lockups since December
by Srdjan Todorovic 21 Feb '24

21 Feb '24

Hi all Anyone else experiencing hard lockups since approx December 2023 on Ubuntu / Kubuntu? I've got the same hardware, there's no hardware changes. I suspect it might have been a kernel / driver upgrade, I did pull some info from dpkg logs that said 12th December > 2023-12-12 09:47:49 upgrade linux-image-generic:amd64 5.15.0.89.86 5.15.0.91.88 Does this mean that I went from version 5.15.0.89.86 to version 5.15.0.91.88? How does one revert back to test for stability? When the lockup occurs, it seems that all graphics processes freeze, mouse freezes. No blinking lights on the keyboard. I vaguely remember that sometimes I can switch to one of the other terminals (what used to be tty2-6) but nothing seems to respond. When I tried to do this a couple of weeks ago, it seemed to be wanting to remove lots of things, and I never proceeded. > sudo apt-get purge linux-image-5.15.0-91-generic I had journal logging to Konsole back then and saw some messages (I have a phone on my phone) about PCIe Bus Error, BadTLP and BadDLLP and timeouts, Uncorrected fatal errors with AER, and nvme0: frozen state and PCIe bus error. How does one even know if their NVME drive is failing? AFAIK, smartctl doesnt work on them in the same way it does on spinning drives. Or is this a kernel bug? Thanks, Srdjan

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