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Mar
12
comment Is it possible to write into RAID chunk multiple times?
Thanks for this clarification!
Mar
11
comment Linux software-RAID4/RAID5 and CPU usage
@TomTom if you write a 1GB file at 0.5GB/s, then you have to perform 4G XOR operations in a second. However, I fully understand your point and SSD's in RAID5 is indeed an extreme example.
Mar
11
comment Linux software-RAID4/RAID5 and CPU usage
@HopelessN00b I see. But for example in case of SSD's, which support sequential write speeds >500MB/s, this would mean 4000000000 XOR calculations per second. Even for multi-core processors, this seems to be considerable load, isn't it?
Mar
11
comment Is it possible to write into RAID chunk multiple times?
In my first statement I indeed meant that if a new write operation occurs(e.g. new file is written to disk), then new cluster is required. And I meant traditional file systems like ext3 and ext4. I added a drawing to clarify my question.
Mar
10
comment What IP addresses to use for monitor the availability of Internet connection?
@pepoluan thanks!
Mar
10
comment What IP addresses to use for monitor the availability of Internet connection?
best practice for automated failover is probably to use ISP upstream router AND tier-1 ISP DNS server AND Google DNS server? In other words, failover connection to another provider only if all three are not reachable at the same time?
Jan
10
comment understanding ipmitool(1) watchdog
Thanks for explaining the bigger picture! Unfortunately I don't have access to this server any more so I can't specify any details.
Aug
2
comment What causes servers to reload or shut down if COLO temperature is around 35C or above?
ok, I see. However, is it a common practice to monitor temperature sensors in OS using for example utilities in lm-sensors and write scripts which initiate an action(for example shutdown) if certain threshold is reached? I guess it's not widespread and most rely on BIOS/UEFI thermal thresholds and actions?
Aug
2
comment What causes servers to reload or shut down if COLO temperature is around 35C or above?
Is Linux kernel (usually) able to initiate a safe shutdown if thermal threshold of BIOS is reached?
Aug
2
comment What causes servers to reload or shut down if COLO temperature is around 35C or above?
This means that if for example server CPU temperature is about to reach the critical BIOS threshold because environmental conditions in COLO, one could override this BIOS threshold from OS if he is sure, that this does not damage the server hardware? How to do this under GNU/Linux?
Aug
2
comment What causes servers to reload or shut down if COLO temperature is around 35C or above?
@joeqwerty exactly. In addition, what determines those thresholds.
Apr
29
comment How do I test the integrity of a mini-DIMM memory module?
@ewwhite I have one Mini-DIMM memory-module which I would like to test using MemTest86+
Feb
26
comment Why is this logfile not empty after truncating it?
It has a point if you have noclobber set in bash.
Feb
26
comment Why is this logfile not empty after truncating it?
I'm using >| because I have noclobber option in bash enabled.
Feb
24
comment lsof displays restored file as deleted
@davey But it isn't possible to move a file under /proc directory, is it? For example: if I execute martin@potato:~$ mv -f /proc/3688/fd/4 /home/martin/testfile.txt, I receive mv: cannot remove /proc/3688/fd/4': Permission denied` error.
Feb
9
comment understanding “ip addr change” and “ip addr replace” commands
On the other hand, if I type in $ ip addr help then usage of the ip addr command is ip addr {add|change|replace} IFADDR dev STRING [ LIFETIME ] [ CONFFLAG-LIST ]
Oct
19
comment recursive grep started at / hangs
Unfortunately, looks like this is not possible under FreeBSD. I executed grep -r -I -D skip 'string_to_match' / under OpenSUSE 12.1 and there it got stuck to /proc/kmsg file, which is a file used for holding messages generated by kernel.