Svarichevsky Mikhail - RSS feed Svarichevsky Mikhail - RSS feed en-us Tue, 10 Jun 2006 04:00:00 GMT Tue, 17 Oct 17 04:56:46 +0300 120 10 <![CDATA[Blade Runner 2049]]> ]]> Fri, 06 Oct 17 10:58:40 +0300 <![CDATA[Is 16 terabytes Enough For Anyone?]]>
After routinely adding yet another 4Tb disk to RAID6 array and trying to resize ext4 partition I was puzzled by the message:
root@lbox2:/var$ resize2fs /dev/md1
resize2fs 1.43.4 (31-Jan-2017)
resize2fs: New size too large to be expressed in 32 bits
That was totally unexpected. EXT4 does not support partitions larger than 16Tb? It appeared that it did not up until somewhat recent time. 5 years ago that would have been a brick wall, 2 years ago I would have to wrestle a little with bleeding edge resize2fs/kernel and now it all works on-the-fly out of the box. One just need to convert this ext4 partition to 64-bit format:
root@lbox2:/var$ resize2fs -b /dev/md1
resize2fs 1.43.4 (31-Jan-2017)
Converting the filesystem to 64-bit.
The filesystem on /dev/md1 is now 3907015424 (4k) blocks long.

root@lbox2:/var$ resize2fs /dev/md1
resize2fs 1.43.4 (31-Jan-2017)
Resizing the filesystem on /dev/md1 to 4883769280 (4k) blocks.
The filesystem on /dev/md1 is now 4883769280 (4k) blocks long.

root@lbox2:/var$ mount /var/bigfatdisk

root@lbox2:/var/bigfatdisk$ df . -H
Filesystem      Size  Used Avail Use% Mounted on
/dev/md1         20T   14T  5.9T  71% /var/bigfatdisk

xy@lbox2:~$ cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md1 : active raid6 sdf1[0] sdg1[7] sdh1[6] sdc1[5] sdb1[3] sde1[2] sda1[1]
      19535077120 blocks super 1.2 level 6, 128k chunk, algorithm 2 [7/7] [UUUUUUU]
      bitmap: 1/466 pages [4KB], 4096KB chunk, file: /var/md1_intent.bin

unused devices: <none>

I remember in the late 90's i've been to - it had enormous 0.5Tb array: it felt like absolutely insane volume of data (I had 850Mb HDD at the time). Probably readers of this article in 2037 would have 1024-layer 3D phase-change memory with 64Tb in 2.5" drive. Good for you, readers from the future... Although it is also possible that popularization of online-content, streaming and cloud apps will make it almost obsolete to have large local storage (with a few exceptions).

BTW since I went for softraid at home about 8 years ago - I had not a single HDD failure (about 50 hdd-years). Still pays off - much less worries about at least 1 thing... ]]>
Tue, 26 Sep 17 23:47:54 +0300
<![CDATA[Golden autumn]]> ]]> Thu, 14 Sep 17 17:18:52 +0300 <![CDATA[Aftermath of X9.3 solar flare]]> ]]> Sun, 10 Sep 17 06:56:47 +0300 <![CDATA[More Deep Space]]> body:after {
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Finished processing photos from my last trip so we all can see the results.

Let's start from Milky Way near M6, M7 (exposure 85x3.2s):

M23, M24, M25 - 226x3.2s:

This is closest galaxy to us, Andromeda. One can see it's arms and spiral structure here. 205x3.2s.
Fuzzy spot below it is another galaxy: M110, also known as NGC 205.

Pleiades (88x3.2s):

And this is M15 (314x3.2s) to feel the scale and compare to my 1 hour exposure on 61cm telescope that I did 3 years ago. Here you can barely see a hint for individual stars in the globular cluster. One need much more than 55mm of focal length here:
Wed, 06 Sep 17 04:49:57 +0300
<![CDATA[Deeper look at the center of our galaxy]]> body:after {
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This is my first experience in deep sky photography. Best place to start is center of our galaxy - where deep sky objects are densely packed.

128 shots @3.2 seconds exposure each. Sony NEX-5 with Canon FD 55mm F1.2@2.2. All frames were stacked using DeepSkyStacker, plate solving and annotation is done by All Sky Plate Solver. There were 2 shooting sessions for this subject - both at Tenerife mountains, at heights 1500 and 2200 meters. Sky glow was twice brighter at 1500m, so this batch of 106 shots was not used in final stacking. Even at 2200m conditions were far from perfect - wind from Africa carried visible dust which contributed to background brightness.

Next time camera with more modern sensor will help as well as less-bright (!!) lens: F1.2 was making bright stars too large even when stopped down to F2.2. And surely, sky tracking mount will allow much longer exposures and higher image SNR.

On mouse over - annotation. Higher resolution on click.
Sun, 03 Sep 17 23:17:51 +0300
<![CDATA[Chemiluminescence of CPPO with dyes]]>

Finally it worked! It is much more complicated than Luminol reaction. The hardest logistical part was finding CPPO (Bis-[2,4,5-trichloro-6-(pentyloxycarbonyl)phenyl]oxalate). Dyes are Fluorescein and Rhodamine R/6G. Catalyst/acidity regulator is Sodium Acetate (more common bases like NaOH or NaHCO3 were not working). It's conventional synthesis from baking soda and acetic acid is messy and painfully slow - next time going to try synthesis from sodium hydroxide. Sodium acetate is actually a pretty interesting chemical as itself due to interesting phase transitions of it's hydrate - some day I will have some fun with it.

Picking solvent for reaction is another story: components are almost insoluble in water so we have to use some organic solvent. In DMSO (which worked nicely with Luminol) there was some aggressive side reaction. Ethyl acetate has extremely bad smell and is quite unsafe. One of the best and final picks was dibutyl phthalate.

This is not the end of my experiments with CPPO, I still have 99.5g left

Tue, 15 Aug 17 03:40:56 +0300
<![CDATA[Daylight astronomy - Venus]]>
I've managed to observe and photograph Venus at noon, when sun was at it's brightest. Without any reference points in the sky and without motorized mount - it's a challenge to spot Venus at daylight. In my binoculars (11x70, with ~4.5° FOV) it was taking couple of minutes using Stellarium and ground reference points.

After that - few more minutes to spot it using main telescope. Venus is no longer a thin sickle - after 3 months Venus and Earth have gone quite far apart on their orbits around the sun:

What's next? Mercury? That's gonna be slightly dangerous... :-)]]>
Mon, 24 Jul 17 03:41:28 +0300
<![CDATA[Sun and AZ5]]> telescope is on a stable mount - TS AZ5:

Farewell photo of sun spot #2665 in Hβ (486.1nm). Solar minimum is almost there so we are not going to see lots of sunspots during the nearest years.

Sun, 16 Jul 17 16:02:43 +0300
<![CDATA[Fuming nitric acid synthesis]]> decomposition of lead(II) nitrate, then dissolving mix of liquid nitrous oxides in 68% nitric acid. This process was too scary to describe in detail

This time I went for conventional and relatively safer route: potassium nitrate (100g) + 98% sulfuric acid (125ml, ~50% excess). You can then distill nearly 100% pure nitric acid.

Final result was reached much easier and faster. Yield was 50ml (which is ~50%, had no more time and ice to continue the process). Next time I will ether have to try something more high-tech (like Peltier cooling with Liebig condenser - Graham's condenser seems to be an overkill and strictly speaking you cannot use it at this angle), or run the process at winter (but it's probably not a good idea to store >100ml of 100% nitric acid due to it's instability).

I've tried a bit of final product right away by etching Texas Instruments IC with very chemically durable plastic.

Conical flask with potassium nitrate and sulfuric acid with glued thermal probe:

It is hard to keep cooling water under 21°C at summer (so that remaining NO2 does not evaporate), so I had add ice blocks pre-cooled to -35°C from time to time:

Receiving flask also had to be cooled:

Here you can see that when Graham's condenser is installed at an angle liquid is trapped in the coils which causes non-continuous liquid flow - that is why it is not recommended to install condenser this way.

Wed, 05 Jul 17 00:46:04 +0300