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are you swapping to ZFS which uses ARC cache? so swapping from RAM back to RAM...?
You run out of RAM in a way that the kernel decides it needs more page cache and therefore tries to free by swapping out other pages. As the kernel does not see the arc cache (it's part of the 9.x used) chances are it tries to swap some of those before they are flushed to disk.
If on top your swap is on zfs this will try to put it on arc while waiting for the flushing and make things worse.
Now thunk what happeny when ZFS wants to finally flush the swapped page to disk.. it needs to be read back in and eventually pass arc again.
ZFS on low RAM systems can be tricky, but in general should always be adjusted to your use case.
Swappiness at low levels is not gonna help in cases, where the kernel desperatly wants to swap.
I'd try to limit arc cache to 4GB for starters. Swappiness=1 is fine also raise vfs_cache_pressure. Eventually reclaim_zone might help as well.
Most impotantly however, do not put swap on the ZFS. Ideally use 1GB if each HDD separately, so swap can utilize parallelism.
Does not mean your system will magically fly in terms of iops and such. Spinning rust keeps being that. And cache can only so far as your workloads are wighin its limits.
Maybe check for caching settings in your apps and try to put some useful limits there. That would be ideal...
No, swap is separate partition that doesn't have ZFS. 512MB on each HD. So SWAP is on sda2, sdb2, sdc2
It's not on ZFS, its separate partition.
After testing I'm 99% sure its kernel config, GNOME config or some OVH modification that is causing this issue. I cannot replicate it on homelab server with Debian and 16GB. Anyways, I dont want to waste more time on it - disabling SWAP completly mitigates this issue and there is no OOM crashes either. There is no issue even with 1Gbps now. Remote desktop is completly fluid with 60fps and no lag whatsoever.
youre running ZFS on partitions and not the disk devices themselves?
I tested writing 250G, no problems, CPU usage 25%, IO delay 25%, sustained write was at about 200MB/s (which is very good as Raid5 /ZFS-Z1 doesnt offer any write speedup iirc, only 2x read speedup)
Nothing tuned regarding swapiness or in ZFS
How did you partition your swap?
I actually completely removed it so maybe I'm in a similar noswap partition club (yay)
But you can use zfs to create a subvol for swapping, would rather do that than additional partitions
Maybe something like this: (quick google search, untested)
zfs create -V 2G -b $(getconf PAGESIZE) -o logbias=throughput -o sync=always -o primarycache=metadata -o secondarycache=none -o com.sun:auto-snapshot=false -o compression=zle zp0/swap.From what I see, dont you have like a stripe of 3 x 512MB partitions?
If so, and swapping is not distributing it, but hammering a single disk, your write gain of 1x the slowest disk hammers down performance of your whole ZFS-Z1 raid as well
If I think about it, ZFS fills the ARC, kernel decides to start swapping (why ever), outsources some RAM to disk A's swap only
disk A is at 100% write speed, ARC wants to cache more writes and fills up RAM again, more swapping, more writing => endless loop (whatever write wins on disk A, either data or swap)
disk B and C basically idle or have low load at that point
@AXYZE, would you mind (running in screen)
dstat -tdD /dev/sdX --top-io, while the performance drops so drastically (I'd guess one disk is at much higher speeds than any other)Will they stop selling these "flash" deals after BF?
They will stop selling them on 19th November.
ALL IN OR NOTHING.
if any ones keen on selling there 1gig lottery server im keen thanks guys.
A question to KS-LE-A owners.
Did your bandwidth increased over IPv6 from 1000/300 to 1000/1000? Delivered this to me on 8th and I got advertised 300 up both on v4 and v6 and yesterday I experienced that they increased the IPv6 speed to gigabit upload.
For this price it is unbeatable avesome.
Is there any KS-LE-B that's speed increased in GRA over IPv6? In FRA I'm almost certain that no lottery win on network however it seems to be that in GRA and RBX they have more capacity on network. And it is an interesting question that will they increase the speeds on KS-LE-B NVMe which is a strong competitor for the bottom line of Kimsufi regular servers with low price.
anyone get delivery KS-LE-B frnach 4tb hdd ???
Don't focus on bandwidth / traffic speed. They can change it at any time.
Yes I know that but seems to be a practice at OVH that in RBX and GRA they increase the limited edition machines IPv6 speed. This happened with KS-LE-1 2022 edition both times when they offered it (2022 Nov. and 2023. Feb.) and this increase still persist. However I did not hear about it in SBG FRA and other EU DCs. And in past year they did not do it so KS-LEs from 2023 still on 1000/100.
Ordered KS-LE-C yesterday. Let's see if I get lucky getting random upgrades. Even if I get advertised HW, still great offer for price so I'll keep it anyway.
What timezone does the 11.11 sale start?
The current flash sale is the 11.11 sale I’m pretty sure
Yep.
Current sale is the 11.11 sale.
From November 5 13:00 to November 19 13:00.
Timezone is probably GMT. However OVH not too strict in this topic, usualy offers ends after 2--3 hours the advertised time.
Other topic: There are a lot more restock on normal servers than normal times. I think a couple gone back to OVH as replaced by a LE server.
I’m looking for the KS-LE-B to render (need iGPU).
I can trade it for the RBX KS-LE-A (3x 2tb) or RBX KS-LE-C (2x ssd + 4tb hdd) and pay the setup. Or both servers for the KS-LE-B.
OVH EU
If you want to get rid of it, let me know. I can arrange it instantly today.
If you want to purchase a server from someone or transfer the ownership of your server, does anyone know what is the process for that?
If you are in the same region, the person can just push it over to your ovh account.
You press a button and its done.
https://help.ovhcloud.com/csm/en-ca-account-manage-contacts?id=kb_article_view&sysparm_article=KB0042991
I see,thank you!
Thank you for the link!
@Neoon — any movement on your KS-A order(s)?
Anyone selling LE-B nvme in EU?