On 04/05/10 13:51, Thomas Mueller wrote: > Am Tue, 04 May 2010 08:34:15 +0200 schrieb Vlamsdoem: > > >> Hello, >> >> I have few questions about my new backup configuration. Before asking my >> questions I will give you some useful information about what I need to >> do. >> I need a backup ± 10 servers with one full backup every week of 3,5 TB >> and an incremental backup of 100GB 5 times/week. I have 48 hours to do >> the full backup and about 8 hours to do the incremental backup. >> Every servers are on a 100Mb ethernet link. Considering all this >> parameters I need some advice about the choice of my hard disks. >> I'm planing to buy a StorageWorks array from Hp (DAS) but I don't know >> what's the best choice for the hard disks. I'm pretty sure that a fast >> hard disk is better for performance but it's not for money saving :), >> I'm wondering if big sata disks of 2TB/7.2k rpm are fast enough to >> achieve my backups in time or is it better to buy faster/sas disks to be >> sure it's done in time. >> > 100Mb == 100mbit? 100Mbit will result in about 9MB/s . To transfer 3,5TB > over ethernet you would need about 108hours. you need _at least_ 1Gbit > ethernet on the backup-server. > > if there are millions of small files involved on the backedup servers, > there will be much less throuhput. also do not place the DB data not on > the same spindles as the backup volumes. > > IMHO the backup disks will not be the bottleneck if you go with SATA 7.2k > drives. but check the specs - i'm sure HP is providing performance data > somewhere on the homepage (or ask your dealer) > > - Thomas > > > > ------------------------------------------------------------------------------ > _______________________________________________ > Bacula-users mailing list > Bacula-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/bacula-users > Sorry my servers are on gigabit links. How do you come to 9MB/s with a 100Mb link, is it not equals to 12,5 MB/s? If it's correct on a gigabit link I would have a rate transfer of 90MB/s and the transfer rate of the sata disks are 3Gb/s(375MB/s). In fact the sata hard disks are not be the bottleneck, that's great news :). I'll save my DB data on an other disk, thanks for the advice.
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