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tape: wait for calibration of LTO-9 tapes

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In case we run into a ready check timeout, query the drive, and
increase the timeout to 2 hours and 5 minutes if it's calibrating (5
minutes headroom). This is effectively a generalization of commit
0b1a30aa ("tape: adapt format_media for LTO9+"), which increased the
timeout for the format procedure, while this here covers also tape
that were not explicitly formatted but get auto-formatted indirectly
on the first action changing a fresh tape, like e.g. barcode labeling.

The actual reason for this is that since LTO-9, initial loading of
tapes into a drive can block up to 2 hours according to the spec. One
can find the IBM and HP LTO SCSI references rather easily [0][1]

As for the timeout, IBM says it only in their recommendations:
> Although most optimizations will complete within 60 minutes some
> optimizations may take up to 2 hours.

And HP states:
> Media initialization adds a variable amount of time to the
> initialization process that typically takes between 20 minutes and
> 2 hours.

So it seems there not a hard limit and depends, but most ordinary
setups should be covered and in my tests it always took around the 1
hour mark.

0: IBM LTO-9 https://www.ibm.com/support/pages/system/files/inline-files/LTO%20SCSI%20Reference_GA32-0928-05%20(EXTERNAL)_0.pdf
1: HP LTO-9 https://support.hpe.com/hpesc/public/docDisplay?docId=sd00001239en_us&page=GUID-D7147C7F-2016-0901-0921-000000000450.html

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
Link: https://lore.proxmox.com/20250415114043.2389789-1-d.csapak@proxmox.com
 [TL: extend commit message with info that Dominik provided in a
  reply]
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
This commit is contained in:
Dominik Csapak 2025-04-15 13:40:43 +02:00 committed by Thomas Lamprecht
parent cb9814e331
commit 07a21616c2
1 changed files with 12 additions and 1 deletions
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13
pbs-tape/src/sg_tape.rs
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@ -659,7 +659,8 @@ impl SgTape {
pub fn wait_until_ready(&mut self, timeout: Option<u64>) -> Result<(), Error> {
let start = SystemTime::now();
let timeout = timeout.unwrap_or(Self::SCSI_TAPE_DEFAULT_TIMEOUT as u64);
let max_wait = std::time::Duration::new(timeout, 0);
let mut max_wait = std::time::Duration::new(timeout, 0);
let mut increased_timeout = false;
loop {
match self.test_unit_ready() {
@ -667,6 +668,16 @@ impl SgTape {
_ => {
std::thread::sleep(std::time::Duration::new(1, 0));
if start.elapsed()? > max_wait {
if !increased_timeout {
if let Ok(DeviceActivity::Calibrating) =
read_device_activity(&mut self.file)
{
log::info!("Detected drive calibration, increasing timeout to 2 hours 5 minutes");
max_wait = std::time::Duration::new(2 * 60 * 60 + 5 * 60, 0);
increased_timeout = true;
continue;
}
}
bail!("wait_until_ready failed - got timeout");
}
}