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Thrawn

Member

Registered: 2012-05-01

Posts: 17

smartctl typical read/write ratio?

Hello!

While performing a SMART test on my ssd, I noticed that my drive had way more write than read (write is more than double the number of read). I would intuitively expect a typical drive usage to have more read than write, but maybe I'm wrong. My drive is encrypted with LUKS if it makes any difference.

Is that a typical usage pattern for a hard drive? What's the ratio Data Units Read/Data Units Written for your drive?

$ sudo smartctl -a /dev/nvme0
smartctl 7.3 2022-02-28 r5338 [x86_64-linux-5.10.181-2-MANJARO] (local build)
Copyright (C) 2002-22, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Number:                       SSDPEMKF512G8 NVMe INTEL 512GB
Serial Number:                      
Firmware Version:                   7002
PCI Vendor/Subsystem ID:            0x8086
IEEE OUI Identifier:                0x5cd2e4
Controller ID:                      1
NVMe Version:                       1.3
Number of Namespaces:               1
Namespace 1 Size/Capacity:          512,110,190,592 [512 GB]
Namespace 1 Formatted LBA Size:     512
Namespace 1 IEEE EUI-64:            5cd2e4 2c91b0a600
Local Time is:                      Thu Jun 29 17:01:02 2023 BST
Firmware Updates (0x14):            2 Slots, no Reset required
Optional Admin Commands (0x0017):   Security Format Frmw_DL Self_Test
Optional NVM Commands (0x005f):     Comp Wr_Unc DS_Mngmt Wr_Zero Sav/Sel_Feat Timestmp
Log Page Attributes (0x0f):         S/H_per_NS Cmd_Eff_Lg Ext_Get_Lg Telmtry_Lg
Maximum Data Transfer Size:         64 Pages
Warning  Comp. Temp. Threshold:     75 Celsius
Critical Comp. Temp. Threshold:     80 Celsius

Supported Power States
St Op     Max   Active     Idle   RL RT WL WT  Ent_Lat  Ex_Lat
 0 +     9.00W       -        -    0  0  0  0        0       0
 1 +     4.60W       -        -    1  1  1  1        0       0
 2 +     3.80W       -        -    2  2  2  2        0       0
 3 -   0.0450W       -        -    3  3  3  3     2000    2000
 4 -   0.0040W       -        -    4  4  4  4     6000    8000

Supported LBA Sizes (NSID 0x1)
Id Fmt  Data  Metadt  Rel_Perf
 0 +     512       0         0

=== START OF SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

SMART/Health Information (NVMe Log 0x02)
Critical Warning:                   0x00
Temperature:                        37 Celsius
Available Spare:                    100%
Available Spare Threshold:          50%
Percentage Used:                    10%
Data Units Read:                    25,033,835 [12.8 TB]
Data Units Written:                 54,103,602 [27.7 TB]
Host Read Commands:                 362,002,145
Host Write Commands:                738,588,029
Controller Busy Time:               16,098
Power Cycles:                       1,129
Power On Hours:                     5,348
Unsafe Shutdowns:                   126
Media and Data Integrity Errors:    0
Error Information Log Entries:      0
Warning  Comp. Temperature Time:    0
Critical Comp. Temperature Time:    0

Error Information (NVMe Log 0x01, 16 of 256 entries)
No Errors Logged

Last edited by Thrawn (2023-06-29 16:17:32)