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Questions tagged [hard-drive]

Questions about hard disks' performance, issues, tips, and software.

Questions about hard disks performance, issues, tips, and related software, e.g. data recovery or disk test software.

2448 questions
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No space left on device -- but there is space

I'm running an Ubuntu 12.04.1 server in a VMware virtualized environment that has a strange issue. Twice now, at seemingly random times, the machine has suddenly been unable to write to the root partition despite plenty of space seemingly available.…
Moduspwnens
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Slow filesystem access

I'm trying to diagnose a slow filesystem issue on a server I look after. It's been ongoing for quite some time, and I've run out of ideas as to what I can try. Here's the thick of it. The server itself is a Dell Poweredge T310. It has 4 SAS hard…
dannosaur
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How can I mount a hard drive as read-only on Windows XP?

I recently had reason to move a hard drive from a computer that blew up to another computer for the purpose of recovering data. Under the (unfortunate) circumstances, both the donor and the recipient were Windows XP SP3 machines. I wanted to be…
eleven81
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What effects do magnets have on HDDs and SSDs?

What do magnets do to hard disk drives and solid state drives upon contact?
Zack Zatkin-Gold
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How to determine which file/inode occupies a given sector

I received messages in /var/log/kern.log that indicate drive failure. The messages occured while copying my $HOME between drives (ext4 -> ext3): [ 5733.186033] sd 4:0:0:0: [sdb] Unhandled sense code [ 5733.186038] sd 4:0:0:0: [sdb] Result:…
krlmlr
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Hot-swap drive got new name. If I add it back to the `md` array and it gets renamed on reboot, will the array still work?

One of the HDDs in my server's RAID config failed, so I took it out of the array and had the data center hot-swap it. They've done that, but now the new drive is /dev/sdc rather than /dev/sda. I suspect that if I reboot the server, it will be…
T.J. Crowder
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Extremely Slow IO with Simple PostgreSQL 8.4.4 Queries on Centos 5.5

The strange and extremely slow IO pattern I'm seeing is this (output of iostat -dxk 1 /dev/xvdb1): Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util xvdb1 0.00 0.00 0.99 0.99 …
ehsanul
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How do I disable hard disk spin down or head parking in FreeBSD?

I have built a new FreeBSD file server with multiple HDDs. I found whenever the disks are not accessed for a while, the disks would spin down completely or park its head. How do I disable HDD spin down or head parking? On Linux, I know it can be…
比尔盖子
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Investigating beyond RAID for disk cluster in a server, is Dynamic Disk Pool comparable?

With the development of hyperconverged systems, we can see other technology than RAID to handle distributed storage (like ceph for example or VSAN or distributed storage like in nutanix). But is there open source Technology derivate from object…
dominix
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Why do sequential writes have better performance than random writes on SSDs?

An LBA (logical block addresses) is a mapping table implemented in the FTL to match between logical and physical pages/blocks in SSDs, my guess is that most SSDs (at least when they are empty) keeps the physical addresses in the same order as the…
SamTh3D3v
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Linux md vs. LVM performance

I am trying to tune my NAS, running openfiler, and wondering why I'm getting relatively poor read performance from 4 WD RE3 drives in RAID 5. EDIT: Please note I am talking about the buffered disk read speed not cached speeds EDIT: Changed…
Dean Smith
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NGINX Serving Large mp4 Files extremely inefficiently

I am currently running nginx/1.0.15 on a Centos 6.6 OS. The server has the following specs: Intel(R) Atom(TM) CPU C2750 @ 2.40GHz (8 cores) 32GB Ram 5 x 6000 GB 7200 RPM (Raid 10) The Problem The server has a 1Gbit/s connection, however it tops…
Kenneth
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Why do servers have SAS instead of SSDs?

I was wondering why do servers still come with SAS disks instead of SSD disks? I know that SAS are faster than normal hard drives but they are still much slower than SSDs. I think they are more expensive too :s so what's the deal here?
katie
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How reliable is HDD SMART data?

Based on SMART data, you can judge the health of a disk, at least that is the idea. If I, for instance, run sudo smartctl -H /dev/sda on my ArchLinux laptop, it says that the hard drive passed the self tests and that it should be "healthy" based on…
andahlst
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root full Linux. No free blocks

df -h reports the '/' partition to be 100% full. While running du -hs * on each directory of this partition shows there is still lot of space. tune2efs which reports just one block to be free. Ran fsck as well, which also shows all blocks being…
Ankit
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