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tape: adapt format_media for LTO9+

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starting with LTO9, a FORMAT(04h) command also reinitializates the tape,
which can take up to tw hours. Since we don't actually want to do that
every time we format, use 'erase_media' when we want a fast erase.
(On a slow erase, we let it run and wait until the drive is ready
again).

The users have to pre-initializate the tapes before using it for them to
work properly though.

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
This commit is contained in:
Dominik Csapak 2023-12-12 12:32:47 +01:00 committed by Dietmar Maurer
parent 70706fc9f6
commit 0b1a30aa39
1 changed files with 14 additions and 6 deletions
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20
pbs-tape/src/sg_tape.rs
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@ -26,7 +26,7 @@ pub use report_density::*;
use proxmox_io::{ReadExt, WriteExt};
use proxmox_sys::error::SysResult;
use pbs_api_types::{Lp17VolumeStatistics, LtoDriveAndMediaStatus, MamAttribute};
use pbs_api_types::{Lp17VolumeStatistics, LtoDriveAndMediaStatus, MamAttribute, TapeDensity};
use crate::{
sgutils2::{
@ -197,16 +197,17 @@ impl SgTape {
/// Format media, single partition
pub fn format_media(&mut self, fast: bool) -> Result<(), Error> {
// try to get info about loaded media first
let (has_format, is_worm) = match self.read_medium_configuration_page() {
let (density, is_worm) = match self.read_medium_configuration_page() {
Ok((_head, block_descriptor, page)) => {
// FORMAT requires LTO5 or newer
let has_format = block_descriptor.density_code >= 0x58;
let density: TapeDensity = TapeDensity::try_from(block_descriptor.density_code)
.unwrap_or(TapeDensity::Unknown);
let is_worm = page.is_worm();
(has_format, is_worm)
(density, is_worm)
}
Err(_) => {
// LTO3 and older do not support medium configuration mode page
(false, false)
(TapeDensity::Unknown, false)
}
};
@ -227,14 +228,21 @@ impl SgTape {
sg_raw.set_timeout(Self::SCSI_TAPE_DEFAULT_TIMEOUT);
let mut cmd = Vec::new();
if has_format {
if density >= TapeDensity::LTO5 && density <= TapeDensity::LTO8 {
cmd.extend([0x04, 0, 0, 0, 0, 0]); // FORMAT
sg_raw.do_command(&cmd)?;
if !fast {
self.erase_media(false)?; // overwrite everything
}
} else if density >= TapeDensity::LTO9 && !fast {
cmd.extend([0x04, 0x01, 0, 0, 0, 0]); // FORMAT, set IMMED
sg_raw.do_command(&cmd)?;
self.wait_until_ready(Some(60 * 60 * 2)) // 2 hours, max. initialization time
.map_err(|err| format_err!("error waiting for LTO9+ initialization: {err}"))?;
self.erase_media(false)?; // overwrite everything
} else {
// try rewind/erase instead
// we also do this for LTO9+ to avoid reinitialization on FORMAT(04h)
self.erase_media(fast)?
}