All Questions
18
questions
0
votes
2
answers
300
views
Check that every file is successfully readable on a volume
For the first time since many years, I have a disk (SSD that shows 99% health with DiskInfo!) that has a few unreadable files. I tried to open these files with wxHexEditor, and when scrolling in the ...
- 1,916
0
votes
0
answers
195
views
Bad disk write performance & high PSI
I'm currently running into an issue where writing files is causing insanely high pressure on the I/O side:
It goes so far that the system even stalls for a few seconds then writes a bit, stalls again,...
- 1
0
votes
1
answer
388
views
Is JBOD or striping better for lots of small files?
I have a server in multi-disk configuration using LVM-on-LUKS in JBOD mode. But I notice in htop that the kernel time in CPU usage is (un)usually very high, and in iotop the jbd2/dm-5-8 and ...
- 28.4k
5
votes
1
answer
273
views
Do writes and reads contend with each other for an SSD? [closed]
I have a disk I/O intensive application where I am reading and writing a lot concurrently.
For a spinning disk, it makes sense that there is contention because the pointer has to move around a lot but ...
- 153
1
vote
1
answer
125
views
Writing keypresses to SSD & wear leveling
I am planning to write an application that tries to write as much to file as possible as to never lose any significant amount of data. It will write every key stroke including micro or even nano-...
- 1,878
2
votes
2
answers
6k
views
rm -rf takes a long time
I have a directory ./aggregated/ in which I have 7550 sub-dirs each containing 250 files. aggregated has 5.5GB in total.
I've tried deleting aggregated via rm -rf aggregated and it is taking hours. ...
- 141
0
votes
1
answer
308
views
Does 'Write cliff' phenomenon only happen to SSD disks?
First of all, I am new to disks, I just know the basics. I am trying to improve performance of a software with heavy I/O and I need to understand how my SAS disks work in terms of read and write speed....
- 3
1
vote
1
answer
652
views
Where to put XAMPP HTDOCS Confusion
Is it okay to put the XAMPP Directory in your SSD?
...considering such cases like you're a web developer and performing small writes to the files under its HTDOCS directory when you make changes / ...
- 170
0
votes
1
answer
93
views
What limits writing to 2 SSD drives at the same time
I'm trying to understand about IO and CPU cores and have gotten myself confused.
Does writing to 2 SSD drives depend on the number of cores? In my mind, if it's a single core process then the ...
- 1,943
0
votes
0
answers
482
views
Debian freezes while intense SSD I/O
I bought an SSD drive (Kingston SSDNow) and installed Debian 8 on it;
The system works fine. But today I'm tried to extract a huge tar archive (~8GB) and in the middle of extraction the system just ...
- 1,199
1
vote
0
answers
283
views
Is I/O error sufficient reason to return SSD on warranty?
Several times I’ve encountered heavy disk errors leading to complete system crash, after reboot m/b doesn’t detect SSD till full PC poweroff.
Here is log I've managed to display before OS gone ...
- 820
1
vote
0
answers
42
views
Determining average i/o file size on my computer
I'd like to see what the average data size is that my computer reads and writes to the hard drive. Many of the SSD benchmarks assume a 4K block of data, but what is my workload averages 16K? How ...
- 11
2
votes
1
answer
4k
views
Diagnosing disk i/o errors, failing disk controllers
My PC has been constantly crashing with disk i/o errors recently and I'm trying to diagnose what the cause is before I order any new parts.
I have windows 7 installed on a ssd (with truecrypt) and I ...
- 23
0
votes
1
answer
645
views
Mac SSD freezing & I/O error
6 months ago I've added a SSD (Samsung 840 Pro 512GB) on the back of the superdrive and enabled TRIM. It's still as fast as it was when I bought it.
Since some days my mac randomly freezes twice a ...
- 101
1
vote
1
answer
3k
views
Linux BFQ Scheduler with SSD
In the past I had always been advised by resources that I can get a performance boost when using SSDs by switching from the default Linux scheduler CFQ to one such as deadline or noop.
Today after a ...
- 229