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Questions tagged [hdparm]

hdparm is a command-line tool on Unix/Linux platforms used to adjust or inspect hard drive configuration parameters.

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Linux Disk tuning help

I have a Software RAID1 disk that is randomly experiencing very slow read times. hdparm -t /dev/md0 /dev/md0: Timing buffered disk reads: 2 MB in 12.43 seconds = 164.80 kB/sec It appears to be one disk in the RAID set that is consistently…
John P
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Benchmarking hard disks on Mac OS X SL

On Linux I would usually use "hdparm -tT device" when I want a quick idea of how an hard drive is performing compared to another; having switched to Mac OS X a few months back I have yet to find something similar and as easy to use. I have read that…
Vito Botta
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How can I test hd performance on an OpenVZ container?

CentOS 5.x | VPS | OpenVZ I'm trying out a vps that uses OpenVZ and am not sure what command to type to measure disk read performance. I thought hdparm would work but I get the following: [root@echo dev]# hdparm -t /dev/simfs /dev/simfs: Permission…
Mike B
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HDD spins up spuriously for no reason

I have four HDDs in my NAS. Three (Western Digital, all the same model) are put in standby mode (spin down) by hd-idle and they stay in standby until I use them. The reason I use hd-idle and not the internal power saving mechanism via hdparm (-S XX…
Lazarus535
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raid not spinning down - mdadm issuing syncs?

I have an issue with an archival server that is running a RAID 5. The server is being accessed only every couple of days, so I want these disks to spin down when there is no activity for a while. Disclaimer: I understand that spinning down disks is…
Philipp Unterbrunner
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"UNMAP not supported" error on a device that supports UNMAP

I was playing with trim/unmap commands on a Samsung SSD (MZ7WD240 model). To check the unmap support on this device i ran the following command: hdparm -I /dev/sda | grep TRIM And as expected the output shows that my device /dev/sda supports…
SamTh3D3v
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Ubuntu seems to ignore spindown_time in config /etc/hdparm.conf

I have /etc/hdparm.conf configured to power down the external USB HDD, but it actually never spins down. When I manually turn it off (hdparm -Y or set its spindown hdparm -S 36) - everything works as expected. It seems like my Ubuntu ignores…
kolypto
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Disk Cached IO very slow

I have two boxes with exactly same hardware configuration. Both having RAID0 (created using mdadm) over SATA disks. But I am getting different cached reads while testing using hdparm command. $ hdparm -tT /dev/sda /dev/sda: Timing cached reads: …
pradeepchhetri
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Differences between hdparm --read-sector and dd with "Current Pending Sectors"

This was originally an "answer" to How to use hdparm to fix a pending sector? I'd been getting SMART notifications for the same "Current Pending Sector" for days. The dd solutions around weren't resolving anything (they'd appear to zero data and…
bsb
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Is wiper.sh working?

I'm setting up a server running Ubuntu Precise, and I'm trying to verify if SSD TRIM is working. fstrim is failing: ~ sudo fstrim -v / fstrim: /: FITRIM ioctl failed: Operation not supported So I tried wiper.sh in hdparm: wiper-3.5 sudo…
Aleksander Blomskøld
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Is it possible to get hdparm to report the current level of performance degradation on my SSD?

I work on a product that is a headless Debian Linux system with removable Intel X-25M solid state drives. Recently we noticed that the read/write performance of these drives degrades over time, and sure enough the culprit was SSD block problems, as…
Jeremy Friesner
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Measuring disk performance for random seeks?

I'm setting up a server that involves lots of database writing during regular updates, and I have wildly varying results between different machines. I'm trying to find out what I can expect from different machines (and hosting providers) without…
gravitystorm
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Hdparm slow server

My web site server is very slow and I contacted my hosting company. This company ask me to execute this command line: hdparm -tT /dev/sda The result is here: /dev/sda: Timing cached reads: 1112 MB in 2.00 seconds = 555.55 MB/sec Timing buffered…
Kiva
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Spin up all raid drives at the same time

Here is the configuration: 4 HDDs in a RAID-5 array (mdadm) hdparm spin_down_time set for all disks Debian jessie 8.11 When the drives are in standby mode and the RAID array is requested, they wake up "sequentially", one after another. It makes…
Tigger
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Spin down of Icy Box Raid Enclosure not working

I am running Ubuntu server 18.04 and I am using an ICY BOX IB-RD2253-U31 enclosure with two WD Black disks (no NAS disks) in RAID 1 mode (mirror). The external enclosure is connected via USB to the Linux server. The disks are two 1TB Western Digital…
JJ Abrams
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