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Diffstat (limited to 'doc/sg_vpd.8')
| -rw-r--r-- | doc/sg_vpd.8 | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/doc/sg_vpd.8 b/doc/sg_vpd.8 index 17d5f130..e1e19956 100644 --- a/doc/sg_vpd.8 +++ b/doc/sg_vpd.8 @@ -1,4 +1,4 @@ -.TH SG_VPD "8" "March 2021" "sg3_utils\-1.46" SG3_UTILS +.TH SG_VPD "8" "June 2021" "sg3_utils\-1.47" SG3_UTILS .SH NAME sg_vpd \- fetch SCSI VPD page and/or decode its response .SH SYNOPSIS @@ -314,6 +314,22 @@ excluding vendor specific VPD pages that start at page number 0xc0: .PP # sg_vpd \-\-all \-\-page=0xbf \-\-raw \-\-inhex=all_vpds.bin .PP +In Linux, binary images of some important VPD page responses (e.g. 0, 80h +and 83h) are cached in files within the sysfs pseudo file system. Since +VPD pages hardly ever change their contents, decoding those files will +give the same output as probing the device with the added benefit that +decoding those files doesn't need root permissions. The long and short +forms are shown: +.PP + sg_vpd \-\-raw \-\-inhex=/sys/class/scsi_generic/sg3/device/vpd_pg83 +.PP + sg_vpd \-rI /sys/class/scsi_generic/sg3/device/vpd_pg83 +.PP +If /dev/sg3 is a disk at 2:0:0:0 , then this invocation should give more +verbose output but essentially the same as the previous two examples. +.PP + sg_vpd \-v \-r \-I /sys/class/scsi_disk/2:0:0:0/device/vpd_pg83 +.PP Further examples can be found on the https://sg.danny.cz/sg/sg3_utils.html web page. .SH AUTHOR |