It took me years and re-learning many, many things I'd forgotten to learn this lesson. My notes are mostly on a private wiki, though. Maybe I should publish them.I enjoy blogging. I really do. It is quite satisfying. I refer to my blogs for my own use. That is what they started off as, way back when I was trying to get my host running with DHCP on ADSL. Notes to help myself, mostly when seeking help and explaining to others what I did.
I agree with this. I think a lot of engineers tend to think on paper or whiteboards. I've had jobs where I fill 2 whiteboards and then people get upset when they get erased.Yes. Yes, you should publish it. What's the downside?
I wish I could be so lucky. For the amount of engineering descisions I have to make on the fly it is not comforting especially when you are talking about $250K repair procedures approved verbally. Nothing in writing.I agree with this. I think a lot of engineers tend to think on paper or whiteboards. I've had jobs where I fill 2 whiteboards and then people get upset when they get erased.
It's not so important but it will indicate a possible power issue. In normal operation it will rise only if you reset the computer without a proper shutdown. The write cache on those disk are not battery backed protected so it will be lose on sudden power lost and if the cache is used for write operation all data that is not flushed to the NAND will be lost. That's why is important not to enable the volatile write cache if the system is not protected by UPS and you should never unplug such disk from the hot swap bay before shutdown it first.Why does this count matter?
before shutdown it first.
camcontrol eject da0
is the right way (for SAS/SATA on controller)???Code:[20:52 r730-01 dvl ~] % sudo smartctl -a /dev/da13 Device Model: Samsung SSD 860 EVO 1TB Sector Size: 512 bytes logical/physical 241 Total_LBAs_Written 0x0032 097 097 000 Old_age Always - 7136126656590
That sounds like a very large number. Was this drive hosting FreshPorts?3,653.7 TB
That sounds like a very large number. Was this drive hosting FreshPorts?
[knew dan ~] % zpool list
NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
tank_fast01 928G 251G 677G - - 5% 27% 1.00x ONLINE -
[knew dan ~] % zfs list
NAME USED AVAIL REFER MOUNTPOINT
tank_fast01 251G 648G 23K none
tank_fast01/dbclone 4.94G 648G 4.94G /usr/jails/dbclone
tank_fast01/dbclone.backups.rsyncer 231G 648G 231G /jails/dbclone/usr/home/rsyncer/backups
tank_fast01/dbclone.postgres 254M 648G 254M /jails/dbclone/var/db/postgres
tank_fast01/empty 1.71G 648G 24K none
tank_fast01/empty/ports 1.71G 648G 1.71G /jails/empty/usr/ports
tank_fast01/vm 13.3G 648G 346M /usr/local/vm
tank_fast01/vm/mkjail 12.9G 648G 12.9G /usr/local/vm/mkjail
Yes you need to unmount it first and if it's part from raid volume eject it from there first.camcontrol eject da0
is the right way (for SAS/SATA on controller)???
Is that 2074 is from:Yes you need to unmount it first and if it's part from raid volume eject it from there first.
TBW = 1024GiB * 2074 / 0,624 = 3 403 487GiB
177 Wear_Leveling_Count 0x0013 001 001 000 Pre-fail Always - 2074
I don't see 0.624 mentioned there. I conclude it is derived from one of the equations. Perhaps if someone else has the time now (I don't), they can explain it for those (and me) who stumble across this thread later.