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5

PCIe Flash will offer significantly better overall bandwidth than SSD or HDD therefore should provide better sequential IO, this may not play as big a part in random IO as you might think but you should still see a degree of improvement over regular SSD, both of which will be very significantly better at this than HDD. Obviously cost/GB comes into play but ...


3

ZFS snapshot space is reflected in the filesystem's consumption. You can derive what you're asking for by monitoring the most appropriate fields below. In the end, you'll watch your filesystem's "avail" space... See how "used"+"avail" is less than "size"?: root@deore:~# df -h /volumes/vol1/LA_Specialty Filesystem size used avail capacity ...


3

As long as you have 8 cores a load of 16-20 translates to 2-2.5 single-processor style, which is not bad (basically, two cars at the stop light instead of one). You have a process ... ffmpeg maybe? ... that seems to be hogging a single core (not multi-thread happy I'd guess) and probably doing a lot of I/O (corresponding bump in lower left chart) I would ...


2

First off, you can use the great info here: http://penetrateit.wordpress.com/2012/02/11/exchange-2010-balancing-the-number-of-mailboxes-and-average-size-across-all-databases/ to figure out some stats needed to help balance the mailboxes across databases. Or you can use Steve's script here: http://www.stevieg.org/2010/09/balancing-exchange-databases/ ...


2

I would use DNS for this. If your business domain is wemonitorstuffforyou.com and the subscribing clients app is called subscribingclientsapp. Configure a subdomain called subscribingclientsapp.wemonitorstuffforyou.com for the clients app to use when sending your data. In the future if that client fails to continue with your service, you can redirect the ...


1

TCP is going to be /much/ slower than UDP, caused by the TCP-over-TCP problem. Basically, TCP relies on packet drops/congestion to identify connection parameters, and your TCP-over-OpenVPN connections do not experience either of those. But you've said that's not an option. You could also try the mtu-disc option to automatically discover the optimal MTU ...


1

WHY SO MANY THREADS I have seen this many times before. This is not a problem. It is just indicative of how the mysqld binary was installed. I have discussed this before : See my Mar 29, 2012 post : Identical mysql processes Older source-compiled versions of mysqld will produce multiple threads. I don't know what setting can avert this. I usually like ...


1

if it is "2.6.32-279" then it is a bug, upgrade it. Should be either equal or more as you mentioned in the link.


1

echo 640 > /sys/block/sda/queue/max_sectors_kb That seems a particularly odd value for max_sectors_kb. You've not said which SSD this is - but most modern drives I've come across are using 4128 byte sectors (although many lie about their geometry - presumably to keep other operating systems happy). Certainly your OS is likely using 4kb pages, although ...


1

In iis 6, you can add a custom header for 'ETag' = "" In iis 7, add an outbound rewrite rule as follows: <outboundRules> <rule name="Remove ETag"> <match serverVariable="RESPONSE_ETag" pattern=".+" /> <action type="Rewrite" value="" /> </rule> </outboundRules> IIS 7 will overwrite custom headers, and all ...


1

Perfmon counters and a tool called PAL (Performance Analysis of Logs) which includes a set of thresholds for various counters. It also generates a report which points out which counters exceeded the thresholds.


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The high write lock percentages isn't the sole indication of performance. You should combine this number with your write queue which indicate the number of inserts/updates/upserts and remove operations that are queued (in total) to acquire a lock. If both the numbers remain consistently high there is a problem which should be addressed immediately. If that ...


1

ESI is definitely the way to go. You basically need to break your webpage into individual sections, and include them with ESI commands in HTML. Varnish then processes the ESI, and pulls all of the sections together. The only other way to do it, would be to use Ajax calls to populate the changing bits, and override the cache times for those specific calls. ...


1

Since upgrading PostgreSQL is not an option, I have tried placing the pg_stat_tmp directory on a tmpfs file system, which delivered a significant performance improvement. I am now running this on a few dozen systems for a couple of months without any noticeable drawbacks. To do this, simply mount pg_stat_tmp with tmpfs in your /etc/fstab file: # <file ...


1

Generally 2x4GB because your theoretical maximum memory bandwidth will be doubled with dual channel access. Also you need to make sure that you use the correct pair of slots on your motherboard.


1

not sure about the 'over 50 seconds' aspect, but you could poll to see if your CPU is over a certain limit. Just a quick sketch in powershell... # checks cpu threshold and runs script in $scriptName variable function CPUthreshold { # mandatory single variable in function for script name Param( [Parameter(Mandatory=$true)] ...



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