Re: [Bacula-users] New tape drive
Hello,My experience is that the larger the block size one uses the more prone the drive is to errors especially when the drive is dirty. A number of years ago I had the chance to speak to a Quantum tape expert and he recommended a max of 500K -- at that time we were talking about an LTO-5. Since then tape technology has improved significantly, but just the same at some point when increasing the block size more errors will occur. I recommend testing various block sizes to see what the performance gains really are as I suspect from my own testing that performance increases quickly become minimal. Unless there are some spectacular performance increases, I would not recommend block sizes of more than 1-2 megabytes on LTO-6 and above and 1 megabyte max for LTO-5.Best regards,KernSent from my Samsung Galaxy smartphone. Original message From: Steven Hammond Date: 3/13/20 15:55 (GMT+01:00) To: bacula-users@lists.sourceforge.net Subject: Re: [Bacula-users] New tape drive Does anyone have recommendations for MAXIMUM BLOCK SIZE for a LTO-7 tape drive (HP). We are currently using 2M on the LTO-5 with success (and it seemed to improve the speed). I didn't know if there was a better setting for the LTO-7 (e.g., 4M) that should be used. Any suggestions?Steven HammondTechnical Chemical CompanyCleburne, TXOn 3/10/2020 12:38 PM, Gary R. Schmidt wrote:> On 11/03/2020 02:26, Steven Hammond wrote:>> We are currently using a LTO-5 drive. We are upgrading to a LTO-7 >> drive. I noticed the directive in our pools STORAGE=LTO-5. I'd like >> the existing pools to use LTO-7 (since it can still read LTO-5 >> tapes). Can I just change the directive in the pool to use our new >> LTO-7 tape drive OR will this mess up the existing LTO-5 tapes in the >> pool. I was wanting to use the existing pools, but I could create >> new ones if necessary. Thanks.>>> It's just a tag, it has no meaning, you could use "Bilbo-Baggins" and > as long as you are consistent it doesn't matter what the contents of > the "Storage" directive is.>> Cheers,> Gary B-)>> P.S. It's considered impolite to change the Subject of an existing > thread on a mailing list to start a new discussion, it buggers up MUAs > that use the "Reference:" header to group things.>>> ___> Bacula-users mailing list> Bacula-users@lists.sourceforge.net> https://lists.sourceforge.net/lists/listinfo/bacula-users___Bacula-users mailing listBacula-users@lists.sourceforge.nethttps://lists.sourceforge.net/lists/listinfo/bacula-users___ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
Re: [Bacula-users] New tape drive
On 13/03/2020 14:51, Steven Hammond wrote: > Does anyone have recommendations for MAXIMUM BLOCK SIZE for a LTO-7 > tape drive (HP). We are currently using 2M on the LTO-5 with success > (and it seemed to improve the speed). I didn't know if there was a > better setting for the LTO-7 (e.g., 4M) that should be used. Any > suggestions? > 2M is the largest that can be used (bacula won't support larger values) For better speeds, make sure you also tweak the following Maximum File Size = 15G Maximum Network Buffer Size = 262144 Maximum block size = 2M Maximum Spool Size = 630G Maximum Job Spool Size = 30G (these are the values used here, with a PCIe Optane P4800 800Gb SSD as bacula spool - this handles sustained simultaneous R/W in excess of 1200MB/s which you'll need if you're doing multiple simultaneous jobs - a _high end_ SATA SSD can _just_ cope with the spool load but you'll saturate the bus and possibly the SATA controller - most onboard chipsets are essentially only a single channel controller with a port multiplexer attached. In any case due to the volume of backups, if you're running a couple of TB/day you risk killing most NAND SSDs fairly quickly. > Steven Hammond > Technical Chemical Company > Cleburne, TX > > On 3/10/2020 12:38 PM, Gary R. Schmidt wrote: >> On 11/03/2020 02:26, Steven Hammond wrote: >>> We are currently using a LTO-5 drive. We are upgrading to a LTO-7 >>> drive. I noticed the directive in our pools STORAGE=LTO-5. I'd like >>> the existing pools to use LTO-7 (since it can still read LTO-5 >>> tapes). Can I just change the directive in the pool to use our new >>> LTO-7 tape drive OR will this mess up the existing LTO-5 tapes in >>> the pool. I was wanting to use the existing pools, but I could >>> create new ones if necessary. Thanks. >>> >> It's just a tag, it has no meaning, you could use "Bilbo-Baggins" and >> as long as you are consistent it doesn't matter what the contents of >> the "Storage" directive is. >> >> Cheers, >> Gary B-) >> >> P.S. It's considered impolite to change the Subject of an existing >> thread on a mailing list to start a new discussion, it buggers up >> MUAs that use the "Reference:" header to group things. >> >> >> ___ >> Bacula-users mailing list >> Bacula-users@lists.sourceforge.net >> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Fbacula-users&data=02%7C01%7C%7C9b66e03453f34cc9e5fb08d7c75e4e7c%7C1faf88fea9984c5b93c9210a11d9a5c2%7C0%7C0%7C637197080163743078&sdata=P78pPKWkpvxNRPsOituNQZoVE%2F9UtpV09XFi4OlVm1w%3D&reserved=0 >> > > > ___ > Bacula-users mailing list > Bacula-users@lists.sourceforge.net > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Fbacula-users&data=02%7C01%7C%7C9b66e03453f34cc9e5fb08d7c75e4e7c%7C1faf88fea9984c5b93c9210a11d9a5c2%7C0%7C0%7C637197080163743078&sdata=P78pPKWkpvxNRPsOituNQZoVE%2F9UtpV09XFi4OlVm1w%3D&reserved=0 > ___ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
Re: [Bacula-users] New tape drive
Does anyone have recommendations for MAXIMUM BLOCK SIZE for a LTO-7 tape drive (HP). We are currently using 2M on the LTO-5 with success (and it seemed to improve the speed). I didn't know if there was a better setting for the LTO-7 (e.g., 4M) that should be used. Any suggestions? Steven Hammond Technical Chemical Company Cleburne, TX On 3/10/2020 12:38 PM, Gary R. Schmidt wrote: On 11/03/2020 02:26, Steven Hammond wrote: We are currently using a LTO-5 drive. We are upgrading to a LTO-7 drive. I noticed the directive in our pools STORAGE=LTO-5. I'd like the existing pools to use LTO-7 (since it can still read LTO-5 tapes). Can I just change the directive in the pool to use our new LTO-7 tape drive OR will this mess up the existing LTO-5 tapes in the pool. I was wanting to use the existing pools, but I could create new ones if necessary. Thanks. It's just a tag, it has no meaning, you could use "Bilbo-Baggins" and as long as you are consistent it doesn't matter what the contents of the "Storage" directive is. Cheers, Gary B-) P.S. It's considered impolite to change the Subject of an existing thread on a mailing list to start a new discussion, it buggers up MUAs that use the "Reference:" header to group things. ___ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users ___ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
Re: [Bacula-users] New tape drive
Ok, I didn't know if it was being stored internally in the database for the tapes (e.g., tape volume Daily-1 was associated in the catalog with storage device LTO-5). Thanks. Steven Hammond On 3/10/2020 12:38 PM, Gary R. Schmidt wrote: On 11/03/2020 02:26, Steven Hammond wrote: We are currently using a LTO-5 drive. We are upgrading to a LTO-7 drive. I noticed the directive in our pools STORAGE=LTO-5. I'd like the existing pools to use LTO-7 (since it can still read LTO-5 tapes). Can I just change the directive in the pool to use our new LTO-7 tape drive OR will this mess up the existing LTO-5 tapes in the pool. I was wanting to use the existing pools, but I could create new ones if necessary. Thanks. It's just a tag, it has no meaning, you could use "Bilbo-Baggins" and as long as you are consistent it doesn't matter what the contents of the "Storage" directive is. Cheers, Gary B-) P.S. It's considered impolite to change the Subject of an existing thread on a mailing list to start a new discussion, it buggers up MUAs that use the "Reference:" header to group things. ___ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users ___ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
Re: [Bacula-users] New tape drive
On 11/03/2020 02:26, Steven Hammond wrote: We are currently using a LTO-5 drive. We are upgrading to a LTO-7 drive. I noticed the directive in our pools STORAGE=LTO-5. I'd like the existing pools to use LTO-7 (since it can still read LTO-5 tapes). Can I just change the directive in the pool to use our new LTO-7 tape drive OR will this mess up the existing LTO-5 tapes in the pool. I was wanting to use the existing pools, but I could create new ones if necessary. Thanks. It's just a tag, it has no meaning, you could use "Bilbo-Baggins" and as long as you are consistent it doesn't matter what the contents of the "Storage" directive is. Cheers, GaryB-) P.S. It's considered impolite to change the Subject of an existing thread on a mailing list to start a new discussion, it buggers up MUAs that use the "Reference:" header to group things. ___ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
[Bacula-users] New tape drive
We are currently using a LTO-5 drive. We are upgrading to a LTO-7 drive. I noticed the directive in our pools STORAGE=LTO-5. I'd like the existing pools to use LTO-7 (since it can still read LTO-5 tapes). Can I just change the directive in the pool to use our new LTO-7 tape drive OR will this mess up the existing LTO-5 tapes in the pool. I was wanting to use the existing pools, but I could create new ones if necessary. Thanks. Steven Hammond Technical Chemical Company Cleburne, TX ___ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
