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 ...
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 ...
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 ...
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 ...
6
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 ...
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 ...
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,...
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 ...
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 ...
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/...
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 ...
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 ...
4
votes
Accepted
Can SAS Tape Drive (HP StoreEver 6250) used with LSI SAS 9200-8e-HP?
Both are older 6 Gb/s SAS, both come from the same vendor (HP).
https://www.storagereview.com/review/hp-storeever-lto-6-ultrium-6250-review-eh970a
https://docs.broadcom.com/doc/12352378
I believe you’...
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 ...
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
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 ...
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 ...
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 ...
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....
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 ...
3
votes
LTO-4 Tape Write Source Throughput Needs
The mbuffer is a small and handy tool which can help you to maintain sustained data flow to the tape drive. It’s available on most linux distributions.
mbuffer - buffers I/O operations and ...
3
votes
Accepted
Attaching more than one Server to a Tape Library
I wouldn't do this at the SAS level, but at the software level. Most backup software supports storing data remotely; what you want is to do something like:
Have a backup server that's connected to ...
3
votes
Accepted
Are LTO Hardware compression and encryption standardized?
Both compression and encryption are parts of the LTO standard. This means that a compressed and encrypted LTO-4 tape should be read by a LTO-6 drive.
That said, as the hardware encryption key can be ...
3
votes
What are the IOPS and physical block size for modern magnetic tapes?
Physical tape is a sequential medium, so forget about (random access) IOPS. I've got some 90 seconds maximum rewind time in my head for LTO. Translated to 45 seconds mean access time, you'd get .02 ...
3
votes
Virtual Tape Libraries for Microsoft Data Protection Manager - Replacement for Crystalink Firestreamer?
StarWind VTL hands down! You can use local disks, you can offload to public cloud (AWS, Azure, and B2) or you can combine both approaches. Highly recommended! We use it with Veeam CE which can’t tier ...
2
votes
What could cause an LTO drive to write at half its capacity?
LTO drives will perform a verification read on the data they have just written. If it is not good enough they can write an extra copy as you mention. The data physically written to the tape contains ...
2
votes
Multi-tape Backup Script
You already have all the tools in place, you're just missing the glue:
never needet it myself, but my tar manual says, that you can execute a script at end of each tape using --new-volume-script ...
2
votes
Do LTO tapes have spare/unused capacity?
Thanks to @kasperd I did some further investigation and this was indeed the problem. Turns out this feature is called the EWEOM (Early Warning End Of Media) and it refers to a marker placed on the ...
2
votes
Multi-tape Backup Script
All yours needs can find theirs answers with bacula
With that, you will be able to :
choose the destinations of yours saves,
manage yours tapes
configure rotation of yours tapes depending of your ...
2
votes
Compression on tape set..but at 2.27TB..end of space
A couple of, nowadays common, kinds of files will not compress well (achieving far less compression than the ~2.5:1 target assumed), even if they are in an uncompressed archive:
anything that is, at ...
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