I have a server that has two filesystems:
git.company.tld ~ # lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 0 500G 0 disk
|-sda1 8:1 0 100M 0 part
`-sda2 8:2 0 499.9G 0 part /
sdb 8:16 0 4T 0 disk
`-sdb1 8:17 0 4T 0 part /srv
git.company.tld ~ # sar -F -s 14:00
Linux 6.1.0-41-amd64 (git.company.tld) 01/12/26 _x86_64_ (4 CPU)
14:00:09 MBfsfree MBfsused %fsused %ufsused Ifree Iused %Iused FILESYSTEM
14:10:09 107280 396403 78.70 82.83 31889739 814261 2.49 /dev/sda2
14:10:09 1018449 3108942 75.32 80.15 251936094 16499362 6.15 /dev/sdb1
Summary: 107280 396403 78.70 82.83 31889739 814261 2.49 /dev/sda2
Summary: 1018449 3108942 75.32 80.15 251936094 16499362 6.15 /dev/sdb1
I can select a specific filesystem in sar e.g. with --fs=/dev/sdb1:
git.company.tld ~ # sar -F -s 14:00 --fs=/dev/sdb1
Linux 6.1.0-41-amd64 (git.company.tld) 01/12/26 _x86_64_ (4 CPU)
14:00:09 MBfsfree MBfsused %fsused %ufsused Ifree Iused %Iused FILESYSTEM
14:10:09 1018449 3108942 75.32 80.15 251936094 16499362 6.15 /dev/sdb1
Summary: 1018449 3108942 75.32 80.15 251936094 16499362 6.15 /dev/sdb1
But apparently, I can not select it by mountpoint, even though the manpage says so?
--fs=fs_list
Specify the filesystems for which statistics are to be displayed by sar. fs_list is a list of
comma-separated filesystem names or mountpoints.
git.company.tld ~ # sar -F -s 14:00 --fs=/srv
Linux 6.1.0-41-amd64 (git.company.tld) 01/12/26 _x86_64_ (4 CPU)
14:00:09 MBfsfree MBfsused %fsused %ufsused Ifree Iused %Iused FILESYSTEM
Unfortunately, the device names aren't stable between reboots - the server was rebooted today, and in the datafile from yesterday, /dev/sda and /dev/sdb were swapped:
git.company.tld ~ # sar -f /var/log/sysstat/sa20260111 -F -s 23:40
Linux 6.1.0-41-amd64 (git.company.tld) 01/11/26 _x86_64_ (4 CPU)
23:40:00 MBfsfree MBfsused %fsused %ufsused Ifree Iused %Iused FILESYSTEM
23:50:00 106689 396994 78.82 82.95 31890860 813140 2.49 /dev/sdb2
23:50:00 1022314 3105076 75.23 80.06 251669381 16766075 6.25 /dev/sda1
Summary: 106689 396994 78.82 82.95 31890860 813140 2.49 /dev/sdb2
Summary: 1022314 3105076 75.23 80.06 251669381 16766075 6.25 /dev/sda1
This makes it tricky to extract data from multiple datafiles at the same time, because now I have to know which way the devices were swapped for each datafile. I tried to use /dev/disk/by-uuid, but apparently that doesn't work:
git.company.tld ~ # ll /dev/disk/by-uuid/83cad40a-92dd-4a30-b203-dbfd8e05ae2e
lrwxrwxrwx 1 root root 10 Jan 12 07:53 /dev/disk/by-uuid/83cad40a-92dd-4a30-b203-dbfd8e05ae2e -> ../../sdb1
git.company.tld ~ # sar -F --fs=/dev/disk/by-uuid/83cad40a-92dd-4a30-b203-dbfd8e05ae2e
Linux 6.1.0-41-amd64 (git.company.tld) 01/12/26 _x86_64_ (4 CPU)
00:00:00 MBfsfree MBfsused %fsused %ufsused Ifree Iused %Iused FILESYSTEM
04:30:00 MBfsfree MBfsused %fsused %ufsused Ifree Iused %Iused FILESYSTEM
07:53:55 LINUX RESTART (4 CPU)
08:00:09 MBfsfree MBfsused %fsused %ufsused Ifree Iused %Iused FILESYSTEM
12:30:09 MBfsfree MBfsused %fsused %ufsused Ifree Iused %Iused FILESYSTEM
Is there a solution that I'm overlooking?
I have a server that has two filesystems:
I can select a specific filesystem in
sare.g. with--fs=/dev/sdb1:But apparently, I can not select it by mountpoint, even though the manpage says so?
Unfortunately, the device names aren't stable between reboots - the server was rebooted today, and in the datafile from yesterday,
/dev/sdaand/dev/sdbwere swapped:This makes it tricky to extract data from multiple datafiles at the same time, because now I have to know which way the devices were swapped for each datafile. I tried to use
/dev/disk/by-uuid, but apparently that doesn't work:Is there a solution that I'm overlooking?