17
votes
Compression on tape set..but at 2.27TB..end of space
In your case it is the file level encryption that is preventing compression.
Encryption tries to make the data stream look as much as random "noise" as possible. Compression tries to increase the ...
- 29.1k
15
votes
How to use the full LTO-2 Tape backup capacity of 200/400GB?
200 GB (marked on the tape) = 200,000,000,000 bytes = ±150 GB (real, 2^30) usable + some metadata.
If you use backup app that has own compression, then there's no hardware compression working with ...
- 12.5k
13
votes
Accepted
Do LTO tapes have spare/unused capacity?
If your drive is new and the tape is of good quality you can expect to be able to write more bytes to the tape than the official capacity. In some sense you can call that spare capacity, but it isn't ...
- 29.7k
8
votes
Anyone using VTL for backups?
Veeam can backup to iSCSI and SMB3 natively. I don't see any viable points in using VTL within your particular scenario. Just an opposite: by not implementing VTL layer you just remove one level of ...
- 12.5k
5
votes
Accepted
Quantum LTO-4 Drive fails with new tapes and need to be cleaned too often
Use common sense. Replace the unit or leverage the manufacturer/warranty contacts.
The behavior you're experiencing is not common or acceptable. Imagine this were a common kitchen appliance like a ...
- 194k
5
votes
Accepted
Restore Legacy Tapes with Veeam
I don't know anything about Veeam or VRanger/HP Data Protector but I wouldn't expect them to be compatible unless Veeam made specific statements about it.
Even if Veeam made those statements I would ...
- 113k
5
votes
Accepted
Hardware compression on tape drives: does it still make sense?
As the tape drive has hardware dedicated to compression, your CPU can be used to something else... so yes, it makes sense. On a file server, you want the server to serve the file request, no ...
- 121
5
votes
Linux LTO-4/5/6 Hardware AES Drive Encryption
I have tested stenc as suggested by sendmoreinfo and it worked well with the LTO-6 drive.
Usage:
Insert a tape and ask the tape drive about its settings:
# stenc -f /dev/nst0 --detail
Generate ...
- 392
5
votes
How to use the full LTO-2 Tape backup capacity of 200/400GB?
As BaronSamedi1958 said, if you are counting binary gigabytes (GiB) then the capacity of a 200 GB tape is about 186 GiB (200 / 1.0243). This is why I encourage people to use real gigabytes (1,000,000,...
- 153
5
votes
How to use the full LTO-2 Tape backup capacity of 200/400GB?
Also take in account the blocking factor. If you're using for instance a 128K block size, and you're backing up many small files, as each file occupy at least one block on tape, you end up with a lot ...
- 6,694
5
votes
Accepted
Compression on tape set..but at 2.27TB..end of space
Compression assumes it can work. tar files generally can not be compressed (they already are), so yes, you may end up not getting the "average compression ratio". Pure text files may compress a lot ...
- 50.7k
5
votes
Accepted
What kind of algorithm is used in LTO tape hardware compression?
The compression is part of the LTO standard, called SDLC, and is a variant of the LZS algorithm
It operates on the data in a block fashion. LTO6 and onward apply this compression to larger data blocks ...
- 1,367
4
votes
Linux tape drive throughput performance statistics
tapestat, part of the iostat package.
[dan@lnaapp-backup ~]$ tapestat 1 1
Linux 3.10.0-514.el7.x86_64 (lnaapp-backup.internal.lr.org) 05/07/17 _x86_64_ (24 CPU)
Tape: r/s w/...
- 850
4
votes
Accepted
dd unable to write to tape drive
Your version of tar appears to be trying to write to the tape device by default, rather than standard output. It appears to be GNU tar. Autodetecting the tape drive was the default before version 1.11....
- 234k
4
votes
Accepted
How to recover data from a Windows 2003 Server HP StorageWorks Ultrium 448 Backup via Linux?
First you have to make contact with your tape drive. Ultrium448 is a scsi one, but it has a linux driver, thus it can't be an issue. Probably you have to reach the tape disk on a char device. HP ...
- 4,904
4
votes
Accepted
Erase old dump tape in Tru64 UNIX
Usually with tape devices you don't have to do anything special to overwrite them - simply start writing again from the beginning of the tape, and whatever was already on there is gone.
As a FAQ for ...
- 77.9k
4
votes
What format does commvault restore to for SQL server backups?
I know this is an old question, but it is the first question that shows up when searching "commvault" on serverfault.
I have two years of experience with Commvault Simpana v9 and v10 as a support ...
- 51
4
votes
Tape backup software for putting multiple backup sets on one tape
Check Veeam Backup and Replication. In v9.5 they allow to append incomplete tapes.
https://helpcenter.veeam.com/archive/backup/95/vsphere/add_gfs_media_pool_advanced.html
The community edition is ...
- 1,476
3
votes
Accepted
Tape drive unusable on 14.04 ESXi VM
The -generic kernel that comes with Ubuntu does not contain the st module responsible for controlling tape drives. That module can be found in the 'extra' kernel package.
apt-get install linux-image-...
- 1,367
3
votes
Accepted
Rsync and off-lined data on tape
Based on your comments it sounds like you've got a hierarchical storage management (HSM) system that is automatically handling restoring files from tape when they're accessed. (You don't specifically ...
- 141k
3
votes
How to recover Symantec Backup Exec backup via Linux?
Backup Exec does speak MTF.
Looking at the actual mtftar source--and issuing the disclaimer that I don't code C, I just limped around faking C a long time ago--I note that the error message in ...
- 18.5k
3
votes
Accepted
Is there a way to backup logs to tape without mounting a NAS?
A NAS is is a fileserver. Period.
To reduce shoe-shining, backup systems frequently back up data to a disk pool first, and then when they have enough data accumulated to fill a tape, they'll relocate ...
- 108k
3
votes
Encrypt backups with GPG to multiple tapes
I'm using this script:
#!/bin/sh
TAPE="/dev/nst0"
mt-st -f $TAPE setblk 0
mt-st -f $TAPE status
totalsize=$(du -csb . | tail -1 | cut -f1)
tar cf - . | \
gpg --encrypt --recipient target@key....
- 925
3
votes
Accepted
Using different tape drives with different servers
Using the Shared Storage Option (Called as Enterprise Server Option in BE 2012), this may be possible. Have a look at this article for more info and requirements about this option - http://www....
- 46
3
votes
Quantum Scalar i80 - I see the tape drive, but not changer
I know this is an ancient post , but the changer will be accessed by an 'sg' device , ie scsi generic. If you are running Linux , it will already have sg support.
sg provides a lower level interface ...
- 81
3
votes
Anyone using VTL for backups?
VTL is a viable option if your LT Drive cannot cope with speed. But a VTL must be embedded in a Target backup application to give you a serious benefit. I discovered Fujitsu CS800 as very appealing: ...
3
votes
Tape Library backup terminology
Tape media are the actual removable tape cartridges that hold the data, tape drives are the machines that write the data to the cartridges and tape libraries/auto-loaders are one or more tape drives ...
- 99.6k
3
votes
Accepted
Veeam Marks Data Tape as Cleaning Tape
This appears to happen when there is an automatic cleaning process and the specified cleaning tape has expired. The next tape that enters the drive seems to get marked as a cleaning tape. There may be ...
- 1,442
3
votes
Determine remaining capacity of LTO tape
You can find the remaining tape capacity in the SCSI logs, along with many other interesting tidbits such as compression ratio, read/write failures, drive/tape history, etc.
sg_logs -a /dev/nst1
This ...
- 232
3
votes
Accepted
What could cause an LTO drive to write at half its capacity?
It sounds like clogged tape drive head. The only thing you can try is:
Clean multiple times with a preferably new cleaning tape the drive.
Run a test backup to see if something changes.
Contact ...
- 505
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