On 07/07/2020 07:31, Per Jessen wrote:
Mathias Homann wrote:
Related: is there a way to "rebalance" a LVM?
The only way I know of is pvmove data to other disk, then pvmove back.
I recall trying that with AIX, which had the "Veritas disk system" which was the AIX version of what became LVM under Linux. I had a LOT (as in tens of terabytes and hundreds of spindles) to work with. The answer is both yes and no. If you move back onto a LV that is striped across a number of spindles, then maybe. It depends on how many disk access channels you have. It also depends on what you are transferring, and what the application to access it is[1]. We had a DB2 application. OK so its not as all-in-one as CICS. the 'code' side got loaded and that was that. The traffic was the DB2 database, which was VERY^3 active. The DBA and I spend my weeks trying to figure out where to put the tables that were 'static' (e.g 'lookup') and what was degrees of 'dynamic'. IBM support was less than helpful. It turned out we knew more about how DB2 performed (and in due course AIX) than they did. BD2 managed things it's own way quite regardless of our efforts with striping. Just as I hated the "one application to rule it all" attitude of CICS (and it's imitators on Tandem and elsewhere) I came to hate DB2 attitude towards disks management. I also hate BtrFS's 'one file system to to manage all disks' attitude. OK, so I'm an old UNIX fogie of the "Each thing does one thing, just one thing and does it well" school. [1] There are many specific answers to that were a SSD is the answer. Perhaps you want an ultra-fast boot[2]. Maybe you want fast program load. Maybe you need fast data access for some value of data. Maybe you can afford the terabytes of SSD and do it all. [2] I get up in the morning and turn the computer on as I pass by on the way to the bathroom. On my way back I log in. By the time my coffee is brewed all my email is collected and sorted and de-spammed; my web browser is up and pages renewed, etc etc. Fast boot is not an issue for me. -- A: Yes. > Q: Are you sure? >> A: Because it reverses the logical flow of conversation. >>> Q: Why is top posting frowned upon? -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org