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Re: [EXT] Disk mirroring in Linux -- MD-RAID or LVM? Advantages and disadvantages?

by Krichevsky, Nicholas J.

To answer your question by asking another one, have you considered ZFS? This is what I use for a RAID10 setup in my NAS, in part because it's just what I know how to use, but its checksumming, CoW snapshotting (unlike LVM, you do not have to allocate space for one explicitly), and array management features are quite nice. The only downside is that it's out-of-tree, so if you're using a distro that updates the kernel fairly frequently, you have to wait a little while for the ZFS folks to update it. On my desktop (which runs Fedora, and made using ZFS annoying since it upgrades kernels often), I use mdadm with two drives in RAID1, with xfs on top of them. IIRC, the reason I went with mdadm over LVM was simply because of maturity, but that's perhaps not the reason you're looking for :) Speaking about performance is where I step out of my depth a little bit, but to my understanding, xfs has very good support for a large number of small/parallel reads (don't quote me on this). Might be worth considering using this on top of mdadm. ________________________________ From: Michael Voorhis via WLUG <wlug(a)lists.wlug.org> Sent: Wednesday, January 20, 2021 3:34 PM To: Worcester Linux Users' Group General Discussion <wlug(a)lists.wlug.org> Cc: Michael Voorhis <mvoorhis(a)mcvau.net> Subject: [EXT] [WLUG] Disk mirroring in Linux -- MD-RAID or LVM? Advantages and disadvantages? Hi all; In Linux I can do software RAID using LVM or with MD (i.e., mdadm) as a basis. I'm currently thinking of a simple mirror of two conventional SATA disks. The machine is being built to do a compute-workload involving examination of many small(ish?) files, and will not be a desktop or a recreational/gaming machine. I don't know anything about the files or how they'll be examined. How would YOU setup a simple mirror in whatever Linux you use? Why do you prefer your selection? Thanks, --MCV. _______________________________________________ WLUG mailing list -- wlug(a)lists.wlug.org To unsubscribe send an email to wlug-leave(a)lists.wlug.org Create Account: https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwlug.mail… Change Settings: https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwlug.mail… Web Forum/Archive: https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwlug.mail…

Jan. 20, 2021

Disk mirroring in Linux -- MD-RAID or LVM? Advantages and disadvantages?

by Michael Voorhis

Hi all; In Linux I can do software RAID using LVM or with MD (i.e., mdadm) as a basis. I'm currently thinking of a simple mirror of two conventional SATA disks. The machine is being built to do a compute-workload involving examination of many small(ish?) files, and will not be a desktop or a recreational/gaming machine. I don't know anything about the files or how they'll be examined. How would YOU setup a simple mirror in whatever Linux you use? Why do you prefer your selection? Thanks, --MCV.

Jan. 20, 2021

Re: We've got a meeting this Thursday! (Jan. 14th, 2021) at 7pm!

by Keith Wright

"Aljerin Butler,Jr. via WLUG" <wlug(a)lists.wlug.org> writes: > I installed the jitsi app on my Samsung Galaxy S10. I need a room > number to join the meeting. I made a similar mistake, except that I did not actually install it. I am not sure what you installed (I was too frightened to install the Debian package). It might be the software needed to run a jit.si server. In any case I think you do not need it. You need a computer with working microphone and speaker (sound), and should have a camera. You also need a web browser that is not ancient. (Lynx https://en.wikipedia.org/wiki/Lynx_(web_browser) will not cut it!) Just put the URL https://meet.jit.si/WlugMA into the web browser. It will ask your permision to use the camera (Yes). It will display a rectangle with a drop down menu and the title "Join Meeting". Do not look in the menu; just click "Join Meeting". It _might_ work! -- Keith PS: I think you can do that any time. If there is no meeting happening, you will be all alone, but you can admire yourself on your own computer screen and see that it mostly sort of works (except for really working). > On Tuesday, January 12, 2021, 9:38:50 PM EST, Tim Keller via WLUG <wlug(a)lists.wlug.org> wrote: > > Hey Everybody, > We've got a meeting this Thursday (Jan. 14th). at 7pm! > It's going to be in our usual place on Jitsi: https://meet.jit.si/WlugMA

Jan. 14, 2021

Re: We've got a meeting this Thursday! (Jan. 14th, 2021) at 7pm!

by Aljerin Butler,Jr.

Tim, I installed the jitsi app on my Samsung Galaxy S10. I need a room number to join the meeting. On Tuesday, January 12, 2021, 9:38:50 PM EST, Tim Keller via WLUG <wlug(a)lists.wlug.org> wrote: Hey Everybody, We've got a meeting this Thursday (Jan. 14th). at 7pm! It's going to be in our usual place on Jitsi: https://meet.jit.si/WlugMA Nothing in particular is planned as a topic but I'm sure a few interesting things will bubble to the top... like the whole CentOS thing and what options there are for us now. Hope to see you there!Tim. -- I am leery of the allegiances of any politician who refers to their constituents as "consumers"._______________________________________________ WLUG mailing list -- wlug(a)lists.wlug.org To unsubscribe send an email to wlug-leave(a)lists.wlug.org Create Account: https://wlug.mailman3.com/accounts/signup/ Change Settings: https://wlug.mailman3.com/postorius/lists/wlug.lists.wlug.org/ Web Forum/Archive: https://wlug.mailman3.com/hyperkitty/list/wlug@lists.wlug.org/message/HPAZX…

Jan. 14, 2021

We've got a meeting this Thursday! (Jan. 14th, 2021) at 7pm!

by Tim Keller

Hey Everybody, We've got a meeting this Thursday (Jan. 14th). at 7pm! It's going to be in our usual place on Jitsi: https://meet.jit.si/WlugMA <https://meet.jit.si/WlugMA> Nothing in particular is planned as a topic but I'm sure a few interesting things will bubble to the top... like the whole CentOS thing and what options there are for us now. Hope to see you there! Tim. -- I am leery of the allegiances of any politician who refers to their constituents as "consumers".

Jan. 13, 2021

Re: dd-wrt and vlans

by John Stoffel

>>>>> "Mike" == Mike Long <mlong(a)datalong.com> writes: Mike> I have verizon fios as my internet provider. The setup is: Mike> Verizon (FIOS-G1100) internet facing router. Mike> D Link DGS-1008 8 port swich (currently used to give additional ports Mike> for NAS, computer, printer, etc.) Mike> 1 wifi network for all wireless devices provided by FIO-G1100 router. Mike> The E4200 router is not currently used and I intended to repurpose it to Mike> create the vlans. I can confirm that dd-wrt is buggy with the e4200 Mike> which may be one reason I have not been successful. Mike> Because of my lack of time to dedicate to this project and possible Mike> hardware incompatability I'm thinking I am better off getting a Mike> different router that is capable of assigning differnt vlans to the Mike> ports as well as provide a wifi networks for each vlan. Ideally I would Mike> have 4 vlans for a guest network , iot, personal devices and work devices. Mike> Does anyone have any suggestions for a good router that has this Mike> functionality built in? It depends. I used to think Ubiquity would be the way I would personally move forward... but I've decided that their gateway router wasn't upto snuff, and the rest of their line wasn't compelling enough. Do you have full control of the FIOS-G1100 router? Does it support VLANs? If not, then you'll need another box behind it. Anyway, I don't have personal experience with MicroTik, but it's got a decent rep, and you can get a 10 x 1g system running RouterOS which supports VLANs. https://mikrotik.com/product/RB3011UiAS-RM I've used an APU1 board with OPNsense 20.7.x and it has VLAN support, but I can't say how well it works since I didn't get my core switch and VLANs configured, and was hesitant to do it while the rest of the family is at home with me. But I should. The D-Link DGS-1008 probably won't support VLANs, so you won't be able to put an IoT devices on there. Getting a switch that supports VLANs is key, since most routers don't have alot of ports to use. So getting a switch with VLAN support (careful, my upstair TP-LINK one is said to have trouble where it puts all traffic on VLAN1 no matter what... Depending on where all your gear is located, maybe something off ebay like an old Cisco switch/router with VLAN support would be a good bet? I personally like keeping the WAPs seperate from the firewall/router and then a seperate switch(es) as well. It means more gear needing VLAN support, but it also means that each device does what it does with much less compromise. In any case, please keep sharing your results! John

Jan. 10, 2021

Re: dd-wrt and vlans

by Mike Long

I have verizon fios as my internet provider. The setup is: Verizon (FIOS-G1100) internet facing router. D Link DGS-1008 8 port swich (currently used to give additional ports for NAS, computer, printer, etc.) 1 wifi network for all wireless devices provided by FIO-G1100 router. The E4200 router is not currently used and I intended to repurpose it to create the vlans. I can confirm that dd-wrt is buggy with the e4200 which may be one reason I have not been successful. Because of my lack of time to dedicate to this project and possible hardware incompatability I'm thinking I am better off getting a different router that is capable of assigning differnt vlans to the ports as well as provide a wifi networks for each vlan. Ideally I would have 4 vlans for a guest network , iot, personal devices and work devices. Does anyone have any suggestions for a good router that has this functionality built in? -mike On 1/5/2021 2:20 PM, John Stoffel via WLUG wrote: >>>>>> "Mike" == Mike Long via WLUG <wlug(a)lists.wlug.org> writes: > Mike> I have been lurking on this list of a long time and have learned much > Mike> over the years. > > Mike> Now I'm hoping someone can point me to a good resource to > Mike> understaning vlans. For some reason networking configurations > Mike> beyond the most basic setups have never been something I really > Mike> have gotten my head around. Databases are more my thing. > > So for VLANs you will also need your core switch at home (or ideally > all your switches) to support VLANs properly. Or you need to have > seperate physical networks, which gets un-wieldy. > > Mike> I have a Linksys E4200 router that I have flashed with the > Mike> latest dd-wrt v24-40559_NEWD-2_K2.6_mini. My objective is to > Mike> setup multiple vlans with multiple SSID's associated with the > Mike> vlans to segragate my business, home, and iot devices from one > Mike> another. After trying this tutorial > Mike> https://www.ciscopress.com/articles/article.asp?p=1730493 and > Mike> reseting the router many times I decided I need to understand > Mike> how vlans work and how to set them up properly with this > Mike> setup. I would like to start by understanding the default setup > Mike> and what role the default bridge br0 plays in that setup and > Mike> then move on from there. > > Can you explain (or show a diagram) of your network? > > So in my case, I've been starting to play around with VLANs as well, > but since my wife and kids are working from home, along with me, it's > hard to find time to possibly break the network screwing around with > VLANs. > > The basic idea is that packets are tagged with the VLANid they are > supposed to be presented to. So on a switch port, it will either be > on all VLANs, or will only pass traffic for one or more specific > VLANS. > > I have TP-Link EAP-EAP225 WAPs (Wireless Access Points) at my house. > I finally gave up on my old Netgear WNDR3700v1,2 routers I had running > DD-WRT, but only using them as WAPs. I have a PCEngines APU4 running > as my firewall, running OPNsense. I like keeping these things > seperate. > > My core switch is an ancient Dell PowerConnect 5324 with 24 1gb > ports. And a small TP-link switch upstairs since I only have one path > up from the basement. > > Anyway... I mean to setup VLANs as well, but the possibility of > breaking things has stopped me for all of 2020 basically. Heh. > > since the Linksys E4200 only has four internal ports, I'm pretty > certain you're running a switch or two behind it. So what I would do > as a first step would be to setup a small switch on a single port, and > set up that port on the E4200 to be in VLAN 10. Then make sure you > route traffic to that VLAN. > > So I'd also make VLAN 10 be the subnet 192.168.10.0/24, to keep it all > simple. > > Put a RaspberryPi or somethingh where you can access it directly, then > configure it for that subnet and see if you can ping and pass traffic. > > At that point, you can setup things so that VLAN 10 can only send > traffic to the internet, and not to any other VLANs. But I don't know > how good the E4200s with DD-WRT are in terms of supporting VLANs. I > seem to remember it was kinda flaky and problematic. > > The real trick is when you want to pass multiple VLANs down a single > cable, and have the switches at each end (or a linux server with VMs > and VLANs configured) pass traffic properly. Then it starts getting > more hairy. > > I'd offer more ideas, but we really need to know more about your > network setup (and your needs/desires) to make it work. > > I too want to put my IOT things onto a seperate VLAN on my WAPs, so I > can isolate that traffic, I just need to setup the core switch > properly. Ideally while everyone else is gone for a day. Or two. > > *grin* > > Please keep posting, I'm sure a bunch of us are in the same boat. > > John > _______________________________________________ > WLUG mailing list -- wlug(a)lists.wlug.org > To unsubscribe send an email to wlug-leave(a)lists.wlug.org > Create Account: https://wlug.mailman3.com/accounts/signup/ > Change Settings: https://wlug.mailman3.com/postorius/lists/wlug.lists.wlug.org/ > Web Forum/Archive: https://wlug.mailman3.com/hyperkitty/list/wlug@lists.wlug.org/message/PNFLC…

Jan. 10, 2021

Re: Urban planning software

by Bradley Noyes

Maybe AB-Street? It is FOSS, but also only in alpha stage. I came across it awhile back when looking for projects using the Rust programing language. Its also not a CAD style drawing app, but still looks super cool to me. Looks like a lot of fun too. https://github.com/dabreegster/abstreet/#ab-street <https://github.com/dabreegster/abstreet/#ab-street> - brad > On Jan 3, 2021, at 16:55, joshua.gage.stone--- via WLUG <wlug(a)lists.wlug.org> wrote: > > Hey everyone! > > I've been taking interest in urban planning recently, and figured I'd > like to try visualizing street layouts. I'd like to mock up roads, > parking spaces, intersections, sidewalkes, etc, but I'm not sure where > to start. > > As far as I'm aware, AutoCAD Civil 3D and SketchUp are fairly popular > applications in the field, but I'm interested in something that's FOSS. > Does anyone have suggestions? > > Looking forward to hearing from you all, and I hope you're all having a > good start to the new year! > > - Josh > > _______________________________________________ > WLUG mailing list -- wlug(a)lists.wlug.org > To unsubscribe send an email to wlug-leave(a)lists.wlug.org > Create Account: https://wlug.mailman3.com/accounts/signup/ > Change Settings: https://wlug.mailman3.com/postorius/lists/wlug.lists.wlug.org/ > Web Forum/Archive: https://wlug.mailman3.com/hyperkitty/list/wlug@lists.wlug.org/message/KIIIF…

Jan. 5, 2021

Re: dd-wrt and vlans

by John Stoffel

>>>>> "Mike" == Mike Long via WLUG <wlug(a)lists.wlug.org> writes: Mike> I have been lurking on this list of a long time and have learned much Mike> over the years. Mike> Now I'm hoping someone can point me to a good resource to Mike> understaning vlans. For some reason networking configurations Mike> beyond the most basic setups have never been something I really Mike> have gotten my head around. Databases are more my thing. So for VLANs you will also need your core switch at home (or ideally all your switches) to support VLANs properly. Or you need to have seperate physical networks, which gets un-wieldy. Mike> I have a Linksys E4200 router that I have flashed with the Mike> latest dd-wrt v24-40559_NEWD-2_K2.6_mini. My objective is to Mike> setup multiple vlans with multiple SSID's associated with the Mike> vlans to segragate my business, home, and iot devices from one Mike> another. After trying this tutorial Mike> https://www.ciscopress.com/articles/article.asp?p=1730493 and Mike> reseting the router many times I decided I need to understand Mike> how vlans work and how to set them up properly with this Mike> setup. I would like to start by understanding the default setup Mike> and what role the default bridge br0 plays in that setup and Mike> then move on from there. Can you explain (or show a diagram) of your network? So in my case, I've been starting to play around with VLANs as well, but since my wife and kids are working from home, along with me, it's hard to find time to possibly break the network screwing around with VLANs. The basic idea is that packets are tagged with the VLANid they are supposed to be presented to. So on a switch port, it will either be on all VLANs, or will only pass traffic for one or more specific VLANS. I have TP-Link EAP-EAP225 WAPs (Wireless Access Points) at my house. I finally gave up on my old Netgear WNDR3700v1,2 routers I had running DD-WRT, but only using them as WAPs. I have a PCEngines APU4 running as my firewall, running OPNsense. I like keeping these things seperate. My core switch is an ancient Dell PowerConnect 5324 with 24 1gb ports. And a small TP-link switch upstairs since I only have one path up from the basement. Anyway... I mean to setup VLANs as well, but the possibility of breaking things has stopped me for all of 2020 basically. Heh. since the Linksys E4200 only has four internal ports, I'm pretty certain you're running a switch or two behind it. So what I would do as a first step would be to setup a small switch on a single port, and set up that port on the E4200 to be in VLAN 10. Then make sure you route traffic to that VLAN. So I'd also make VLAN 10 be the subnet 192.168.10.0/24, to keep it all simple. Put a RaspberryPi or somethingh where you can access it directly, then configure it for that subnet and see if you can ping and pass traffic. At that point, you can setup things so that VLAN 10 can only send traffic to the internet, and not to any other VLANs. But I don't know how good the E4200s with DD-WRT are in terms of supporting VLANs. I seem to remember it was kinda flaky and problematic. The real trick is when you want to pass multiple VLANs down a single cable, and have the switches at each end (or a linux server with VMs and VLANs configured) pass traffic properly. Then it starts getting more hairy. I'd offer more ideas, but we really need to know more about your network setup (and your needs/desires) to make it work. I too want to put my IOT things onto a seperate VLAN on my WAPs, so I can isolate that traffic, I just need to setup the core switch properly. Ideally while everyone else is gone for a day. Or two. *grin* Please keep posting, I'm sure a bunch of us are in the same boat. John

Jan. 5, 2021

dd-wrt and vlans

by Mike Long

I have been lurking on this list of a long time and have learned much over the years. Now I'm hoping someone can point me to a good resource to understaning vlans. For some reason networking configurations beyond the most basic setups have never been something I really have gotten my head around. Databases are more my thing. I have a Linksys E4200 router that I have flashed with the latest dd-wrt v24-40559_NEWD-2_K2.6_mini. My objective is to setup multiple vlans with multiple SSID's associated with the vlans to segragate my business, home, and iot devices from one another. After trying this tutorial https://www.ciscopress.com/articles/article.asp?p=1730493 and reseting the router many times I decided I need to understand how vlans work and how to set them up properly with this setup. I would like to start by understanding the default setup and what role the default bridge br0 plays in that setup and then move on from there. Thanks in advance, Mike

Jan. 5, 2021