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View Ertürk İhsan Limon's profile on LinkedIn


Red Hat Certified Engineer


VCP5 Certified


VMware HA warnings on VMs with 3D Graphics and VMware Tools upgrades

Recently I’ve been busy with the upgrade of my vSphere 6.0U2 environment to 6.5U1. During and after the upgrade some of the VMs started getting rebooted by VMware HA. VMs were unresponsive at that stage and vSphere logged “OS crash” due to VMware Tools heartbeat loss. VMware HA VM monitoring naturally tried to reset the machines, however randomly for some it succeeded, for some it didn’t. All of the crashed VMs have one configuration in common: 3D Graphics enabled. At first I considered the reason was VMware Tools, but then I thought: “Is it possible to lose backward compatibility this much between vSphere versions?” Actually the running Tools versions were not updated since vSphere 5.5 and somehow it didn’t complain until this upgrade.

There were two different logs (screenshots below) on the VMs that HA failed to reset, first one recurring very frequently, almost every 20 seconds:

vSphere HA attempted to reset the virtual machine because of a heartbeat failure from VMware Tools or a guest application, depending on how vSphere HA was configured. However, the reset operation failed. The most likely reason for the reset failure is that the virtual machine was running another task at the time the reset was initiated. Action: Check to see whether the virtual machine requires attention and reset it manually if necessary.

&

This event is logged when vSphere HA did not reset a VM affected by an inaccessible datastore. It will attempt to reset the VM after storage failure is cleared. The VM is affected by an inaccessible datastore due to storage connectivity loss. Resetting such a VM might cause the VM to be powered off and not restarted by vSphere HA.

I couldn’t see any ongoing activity or an inaccessible datastore. These logs seemed misdirecting so I started updating VMware Tools and virtual HW as recommended. As suspected, it solved the problem: VMs stopped crashing and found some peace.

When you don’t have the luxury to restart the systems, you may choose to “postpone” the VMware Tools and virtual HW upgrade thinking that it is not compulsory and has an extended support. Here is a good old VMware blog entry about the subject: https://blogs.vmware.com/vsphere/2013/02/is-a-vmware-tools-upgrade-required-when-upgrading-vsphere.html. Although the VMware Product Interoperability Matrix shows Tools from 5.5 still works on ESXi 6.5U1, my case proved that there may be exceptions on rare configurations. The system needs to be kept as up-to-date as possible, as a whole.

Let’s finish with VMware’s statement:

Although upgrading VMware Tools is optional, it is still highly recommended.   The extended support is meant to facilitate upgrades and should not be seen as an excuse to avoid upgrading VMware Tools.

about “Shape of My Heart”

Sting talks…

“I wanted to write about a card player, a gambler who gambles not to win but to try and figure out something, to figure out some kind of mystical logic in luck, or chance, some kind of scientific, almost religious law. So this guy’s a philosopher, he’s not playing for respect and he’s not playing for money, he’s just trying to figure out the law – there has to be some logic to it. He’s a poker player so it’s not easy for him to express his emotions, in fact he doesn’t express anything, he has a mask, and it’s just one mask and it never changes. That’s good for a poker player but it’s terrible for a lover. If you are having a relationship with a guy like that the poor woman is lost, so I tried to create a little story that the guy was searching with his gambling and at the same time losing his relationship. The derivation of playing cards are actually tarot cards, and they are thousands of years old, And the suits of the cards – diamonds mean money, clubs are weapons, spades are swords and the hearts are love – and I got more involved in this thing. The shape of the heart is not the shape of the human heart so there’s a kind of conflict there between reality and fantasy.”

‘Ten Summoner’s Tales’ Promotional Interview Disc, ’93

“I think that reticence about being able to express love is probably part of me, but also the idea of the interest of life beyond winning. I’m not sure I need to win anymore. I enjoy to play the game for other reasons.”

Los Angeles Times, 5/93

Synology NAS noise and vibration reduction

Ever since I’ve got my Synology NAS device I kept it on my desk. I wasn’t bothered at first but after some time the buzzing sound that it created got my attention. First I checked the device and the removable parts. Interestingly there is no rubber to help fighting with vibration in Synology design. The hard plastic drive sleds are directly sitting on metal cage, creating the perfect room for it. I had to do something, prevent the vibration causing this annoying noise and eating up my drives’ lifetime.

After a short investigation in Google, I saw that I wasn’t the only one complaining. User Chipware in reddit forum, explained that he solved his problem with only some velcro. I bought some self-adhesive velcro (approx. 5 cm per drive is sufficient) and applied it to the sleds where they touch the cage, like he did. (click on the photo to enlarge)

Result: A significant decrease in the noise. After I put some anti-static foam under the feet, I could not feel any vibration from the desk anymore. I can only hear the disk head movements and a relatively quiet fan now. I am glad that I took care of this before it created any bad sectors. Strongly suggested.

Fair warning: Although this is perfectly safe, I am not responsible for any damage that you may cause to your device.

Synology NAS noise reduction with some velcro

arrogance

Dr. Mendelez : Bet you’ve seen many of these. I remember my first. Kept thinking, “It doesn’t get any better than this.” And for you, I’m afraid, that’s literally true. You’re a nice kid, and you’re obviously very smart, but you don’t belong here. So, as long as you’re part of my team, this is all you’re ever going to be doing… suction.
Shaun : I saw a lot of surgeons in medical school. You’re much better than them. I have a lot to learn from you… You’re very arrogant. Do you think that helps you be a good surgeon? Does it hurt you as a person? Is it worth it?

Mr. Robot and fsociety

[S01E01 – eps1.0_hellofriend.mov]

Krista : What is it about society that disappoints you so much?
Elliot : Oh, I don’t know. Is it that we collectively thought Steve Jobs was a great man, even when we knew he made billions off the backs of children? Or maybe it’s that it feels like all our heroes are counterfeit. The world itself’s just one big hoax. Spamming with our running commentary of bullshit masquerading as insight, our social media faking as intimacy. Or is it that we voted for this? Not with our rigged elections, but with our things, our property, our money. I’m not saying anything new. We all know why we do this, not because Hunger Games books makes us happy but because we wanna be sedated. Because it’s painful not to pretend, because we’re cowards. F.ck society.
(Krista, echoing)
Krista : [normal voice] Elliot. You’re not saying anything. What’s wrong?
Elliot : Nothing.

[S01E10 – eps1.9_zer0-day.avi]

Elliot : You’re not real.
Mr. Robot : What? You are? [scoffs] Is any of it real? I mean, look at this. Look at it! A world built on fantasy! Synthetic emotions in the form of pills, psychological warfare in the form of advertising, mind-altering chemicals in the form of food, brainwashing seminars in the form of media, controlled isolated bubbles in the form of social networks. Real? You want to talk about reality? We haven’t lived in anything remotely close to it since the turn of the century. We turned it off, took out the batteries, snacked on a bag of GMOs while we tossed the remnants in the ever-expanding dumpster of the human condition. We live in branded houses trademarked by corporations built on bipolar numbers jumping up and down on digital displays, hypnotizing us into the biggest slumber mankind has ever seen. You have to dig pretty deep, kiddo, before you can find anything real. We live in a kingdom of bullshit, a kingdom you’ve lived in for far too long. So don’t tell me about not being real. I’m no less real than the f.cking beef patty in your… As far as you’re concerned, Elliot, I am very real.

yerçekimli karanfil

Biliyor musun az az yaşıyorsun içimde
Oysaki seninle güzel olmak var
Örneğin rakı içiyoruz, içimize bir karanfil düşüyor gibi
Bir ağaç işliyor tıkır tıkır yanımızda
Midemdi aklımdı şu kadarcık kalıyor.

Sen o karanfile eğilimlisin, alıp sana veriyorum işte
Sen de bir başkasına veriyorsun daha güzel
O başkası yok mu bir yanındakine veriyor
Derken karanfil elden ele.

Görüyorsun ya bir sevdayı büyütüyoruz seninle
Sana değiniyorum, sana ısınıyorum, bu o değil
Bak nasıl, beyaza keser gibisine yedi renk
Birleşiyoruz sessizce.

Edip CANSEVER

DeLorean

Çocukluğumda ilk gördüğüm andan itibaren hayranı olduğum, resimlerini çizdiğim araba ben ona gidemeden ayağıma geldi sağolsun. Hayatta yapılacaklar listemden bir kalemi daha işaretlemiş oldum. Bir sonraki ehliyeti yeniledikten sonra kendisini kiralamak olacak 🙂

somewhere only we know

Bu şarkıyı ilk kez Radyo ODTÜ’de duyduğumda sene 2004’tü. Anlamlı olması bir yana, anlam ağırlığının zamanla değişmesi inanılmaz.

Dinlemeye değer Lily Allen cover’ı için: https://www.youtube.com/watch?v=mer6X7nOY_o

Hayır

Dinlensin diyedir gözlerimiz
Bu önümüzde açılıp giden manzara;
Bu dünya, yoruldu mu kuşlar konsun diyedir,
Ve tanrılar boşluktan bıkınca.

Ellerimize malûm olur nedense
Suların rengi balıklarıyle, çiçekleriyle,
Düşünmenin huzuru ayân olur;
Soğuğun sessizliği hâkeza.

Yuvarlanan yıldızlar içinde saçlarımız,
Boylarımız büyür usul usul;
Duyulmasın diye gürültüler uykularda
Yağmurlar yağar geceleri.

Can YÜCEL

time

Riggs : You know, it’s not getting any easier. You know, time’s not helping.
Dr.Cahill : Why would it?
Riggs : ‘Cause everybody says that it does.
Dr.Cahill : People who say that don’t understand. Time is cruel. It punishes. I mean, we sentence people to time. I don’t know that it makes it any easier.
Riggs : Then what am I doing here?
Dr.Cahill : You’re looking for a way to make it hurt a little less.