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Mar
12
comment Write to unallocated space on LVM2
Most modern harddisks supports secure erase in firmware, which is quicker than doing the old dd if=/dev/urandom of=/dev/hda method.
Mar
11
comment Which is faster? 4x10k SAS Drives in RAID 10 or 3x15k SAS Drives in RAID 5?
@John Is it required? Should anybody be encouraged to trust RAID redundancy? In my experience raid is fine for improving up time and performance on low quality (customer) spinning disks. My experience is also that SSD disks perform well enough that the raid controller becomes a bottle neck. Finally my experience is that raid systems have nasty failure modes and should be removed whenever possible.
Mar
11
comment Which is faster? 4x10k SAS Drives in RAID 10 or 3x15k SAS Drives in RAID 5?
Looking through the price lists we use for ordering. SAS disks at 15k at 60-80 gb gives prices of around 2-5 USD/GiG. Similar sized MLC SSD disks costs 3-6 USD/GiG. Intel Intel X25-M G2 are around 4 USD/GiG.
Mar
11
comment Which is faster? 4x10k SAS Drives in RAID 10 or 3x15k SAS Drives in RAID 5?
Eh? I really really really hope you are not claiming that RAID is there for backup purposes. RAID is not backup. Raid MIGHT improve uptime, but it is also a single point of failure. I have had more data loss from failed RAID controllers than from failed drives during my career.
Mar
11
comment faking NAT with a VMware distributed switch across multiple hosts
I would strongly recommend adding a network map also. I work a bit with vmware, but I can't even figure out what the scenario is.
Mar
11
revised Which is faster? 4x10k SAS Drives in RAID 10 or 3x15k SAS Drives in RAID 5?
added 364 characters in body
Mar
11
comment Proxy SSL from load balancer
The systems I have worked with sets a http header which informs you that the channel was properly encrypted. There is most likely something similar on your system.
Mar
11
answered Proxy SSL from load balancer
Mar
10
answered Write to unallocated space on LVM2
Mar
10
answered Which is faster? 4x10k SAS Drives in RAID 10 or 3x15k SAS Drives in RAID 5?
Mar
10
comment How to install yum on Fedora Core 6
yum should be there from the standard installation. If it is not, have you tried installing it from the RPM? What kind of error are you speaking about?
Mar
8
answered How to backup a full Centos Server?
Mar
8
comment Can't Repair Mysql Table
Then you are pretty much out of luck. Backups are a nice thing. You could also monitor this bug report which seems to be related bugs.mysql.com/bug.php?id=46565
Mar
8
answered Can't Repair Mysql Table
Mar
8
comment Small Scale Point-to-Point Fibre optics
The fiber does not have any special installation demands compared to copper. Being non-conductive it's actually considerably easier to pull them, as you don't need to worry about induction. If you are reusing an old duct make sure the person installing knows what he is doing, as it's easy to destroy both cables when pulling a new one in. For the termination of the fiber you need to splice on a patch panel. This is done with a fusion splicer. They are expensive and requires training, let a contractor do that for you. He can also measure the fiber and give you a protocol.
Mar
8
comment RAID 6 vs RAID 10? Which would you choose
Let me add then: Online backup is not backup. If it is a backup it should be stored on tape/disks and put in a safe somewhere far away from the rest of the systems. RAID does not aid in that.
Mar
7
accepted syslog (auth log) reports incorrect time
Mar
7
comment syslog (auth log) reports incorrect time
Reinstalling the server finally removed the problem. Still no idea what caused it.
Mar
7
comment How do I find out details of what software a DNS server is using?
Running nmap against a DNS server can end you up on their "people I don't like list". Don't nmap systems without permission from the administrators.
Mar
7
answered Are there any tests I can run on a network to simulate 100 heavy network users?