Omnius - Revision history

Dulzet at 07:40, 10 January 2020

2020-01-10T07:40:56Z

← Older revision		Revision as of 07:40, 10 January 2020
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	R.I.P. and thank you, Omnius		R.I.P. and thank you, Omnius.
	~~long~~ life [[Essun]] !!
			Long life [[Essun]] !!


			From here on, this is deprecated.

	Omnius WAS the main server providing services on the calafou internal network (".calafou").		Omnius WAS the main server providing services on the calafou internal network (".calafou").

Dulzet at 07:38, 10 January 2020

2020-01-10T07:38:56Z

← Older revision		Revision as of 07:38, 10 January 2020
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	Omnius is the main server providing services on the calafou internal network (".calafou").		R.I.P. and thank you, Omnius
			long life [[Essun]] !!

			Omnius WAS the main server providing services on the calafou internal network (".calafou").

	= Services =		= Services =

Maxigas at 20:17, 26 December 2019

2019-12-26T20:17:33Z

← Older revision		Revision as of 20:17, 26 December 2019
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	</pre>		</pre>

	It is also possible to run different kinds of health checks on the disk using the same command. The three adjacent columns in the above output are between ~~000~~ and ~~255~~, where ~~255~~ is the best and ~~000~~ is the worst. The first column is the current health value, the second column is the worst ever measured health value, and the third column is the manufacture-assigned limit where the disk should be replaced. For example, the output above shows bigger numbers in the first and second column than in the third, which means that Raw Read Error Rate is within healthy limnits in all the disks.		It is also possible to run different kinds of health checks on the disk using the same command. The three adjacent columns in the above output are between 001 and 254, where 254 is the best and 001 is the worst. The first column is the current health value, the second column is the worst ever measured health value, and the third column is the manufacture-assigned limit where the disk should be replaced. For example, the output above shows bigger numbers in the first and second column than in the third, which means that Raw Read Error Rate is within healthy limnits in all the disks.

	== Where are the disks connected? ==		== Where are the disks connected? ==

Maxigas: Correct the interpretation of smartctl output

2019-12-26T20:11:43Z

Correct the interpretation of smartctl output

← Older revision		Revision as of 20:11, 26 December 2019
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	</pre>		</pre>

	~~'''~~The P above ~~means "prefailure warning"~~, which means that all the disks ~~are close to their end of life!''' Basically, we should soon trash these disks and replace them with new ones. They already served us surprisingly well for many years~~.		It is also possible to run different kinds of health checks on the disk using the same command. The three adjacent columns in the above output are between 000 and 255, where 255 is the best and 000 is the worst. The first column is the current health value, the second column is the worst ever measured health value, and the third column is the manufacture-assigned limit where the disk should be replaced. For example, the output above shows bigger numbers in the first and second column than in the third, which means that Raw Read Error Rate is within healthy limnits in all the disks.

	== Where are the disks connected? ==		== Where are the disks connected? ==

Maxigas: Add smartctl info

2019-12-26T16:48:11Z

Add smartctl info

← Older revision		Revision as of 16:48, 26 December 2019
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	Nota bene: The last few lines of <code>/etc/fstab</code> show that some directories on <code>/srv/instanbul</code> are mounted on <code>/var/alexandria/</code>!		Nota bene: The last few lines of <code>/etc/fstab</code> show that some directories on <code>/srv/instanbul</code> are mounted on <code>/var/alexandria/</code>!

			=== How healthy are the disks? ===

			The <code>smartmontools</code> package in Debian provides the <code>smartctl</code> command to check disk health. Modern hard disks support the SMART standard, which is for keeping a diary of errors and comparing it with the ideal performance of the disk as it was specified by the vendor. It is useful for finding out when the disk is getting old and starts to make mistakes. After some time making mistakes, the disk can die easily.

			<pre>
			root@omnius: for disk in sda sdb sdc sde sdf ; do smartctl -x /dev/$disk > /root/reinstall/smartinfo/$disk.txt ; done

			root@omnius:~/reinstall/smartinfo# rgrep Raw_Read_Error_Rate *txt
			sda.txt: 1 Raw_Read_Error_Rate POSR-K 200 200 051 - 0
			sdb.txt: 1 Raw_Read_Error_Rate POSR-K 200 200 051 - 0
			sdc.txt: 1 Raw_Read_Error_Rate POSR-K 200 200 051 - 4
			sdd.txt: 1 Raw_Read_Error_Rate PO-R-- 100 100 050 - 0
			sde.txt: 1 Raw_Read_Error_Rate POSR-- 100 253 006 - 0
			sdf.txt: 1 Raw_Read_Error_Rate POSR-- 108 092 006 - 66333935
			root@omnius:~/reinstall/smartinfo#
			</pre>

			'''The P above means "prefailure warning", which means that all the disks are close to their end of life!''' Basically, we should soon trash these disks and replace them with new ones. They already served us surprisingly well for many years.

	== Where are the disks connected? ==		== Where are the disks connected? ==

Maxigas: /* Automatic */

2019-12-26T00:57:07Z

Automatic

← Older revision		Revision as of 00:57, 26 December 2019
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	# Password incorrect: the script has an old password.		# Password incorrect: the script has an old password.

	== Automatic ==		== Automatic (BROKEN: Raspi needs fixing) ==

	Mandotron is another computer (a Raspberry Pi) which should under normal circumstances boot omnius.		Mandotron is another computer (a Raspberry Pi) which should under normal circumstances boot omnius.

Maxigas: /* 2. Offsite backup for alexandria */

2019-12-26T00:56:22Z

2. Offsite backup for alexandria

← Older revision		Revision as of 00:56, 26 December 2019
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	alexandria is automatically copied to another disk. So if one disk fails, they should still work without interruption.		alexandria is automatically copied to another disk. So if one disk fails, they should still work without interruption.

	== 2. Offsite backup for alexandria==		== 2. Offsite backup for alexandria (BROKEN: NAS failed)==

	Backup happens every day at 3am using a software called "restic", to hypatia, which is a NAS (Network Attached Storage) far from the hacklab.		Backup happens every day at 3am using a software called "restic", to hypatia, which is a NAS (Network Attached Storage) far from the hacklab.

Maxigas: /* 1. RAID1 for alexandria */

2019-12-26T00:55:44Z

1. RAID1 for alexandria

← Older revision		Revision as of 00:55, 26 December 2019
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	= Backups =		= Backups =

	== 1. RAID1 for alexandria ==		== 1. RAID1 for alexandria (BROKEN: now it is a RAID0)==

	alexandria is automatically copied to another disk. So if one disk fails, they should still work without interruption.		alexandria is automatically copied to another disk. So if one disk fails, they should still work without interruption.

Maxigas: /* apt-cacher-ng */

2019-12-26T00:55:06Z

apt-cacher-ng

← Older revision		Revision as of 00:55, 26 December 2019
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	Ideally, a short description of services should be available at http://omnius.calafou (this address is only accessible from the local network, e.g. if you are physically in Calafou or use a VPN to connect to the Calafou network).		Ideally, a short description of services should be available at http://omnius.calafou (this address is only accessible from the local network, e.g. if you are physically in Calafou or use a VPN to connect to the Calafou network).

	== apt-cacher-ng ==		== apt-cacher-ng (OLD) ==

	"Cache para tu distro de linux, cuanto mas la uses más rápido bajarás tus paquetes."		"Cache para tu distro de linux, cuanto mas la uses más rápido bajarás tus paquetes."

Maxigas: /* Specifications */

2019-12-26T00:53:41Z

Specifications

← Older revision		Revision as of 00:53, 26 December 2019
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	'''2x2.66Ghz CPU:''' It seems that omnius has 2 Intel(R) Xeon(TM) CPU 2.66GHz CPUs (single core).		'''2x2.66Ghz CPU:''' It seems that omnius has 2 Intel(R) Xeon(TM) CPU 2.66GHz CPUs (single core).

	'''(2x)~~2TB~~ HDD:''' alexandria has two ~~2TB~~ HDDs in ~~RAID1~~, so effectively ~~only one can be used to store useful data~~.		'''(2x)1TB HDD:''' alexandria has two 1TB HDDs in RAID0, so they effectively look like a 2TB disk.

	=== More details ===		=== More details ===