On Sunday, 8 December 2002 at 17:04:28 +0100, Mark Rowlands wrote: > I have decided to dip my toe into the vinum waters primarily for improved read > performance, not redundancy or reliability. I have backups for that ;-). > > I have two questions, one related to optimal stripe size and one to gathering > statistics. > > I have a freshly cvsupped 4.7 stable currently installed on a 30g single disk > I propose to add a second 30gb disk as a mirror of this. and to add two new > identical disks (maxtor fdb-9 120gb) and create a striped volume for data on > those. > > I propose (maybe) to create a single striped volume but...... what stripe > size? Reading the various vinum docs and looking at some of the samples > I found lying around the web left me a touch confused. > > There are two categories of files on the data disk, largeish ( 4-5mb) which > are most frequently accessed but the overwhelming majority of files are much > smaller (<4k) but not accessed so frequently. > > So, is it better to try and optimize for the most frequently accessed, or the > filesize that comprises the bulk of file accesses? or better to create two > volumes with different stripe sizes. In either case, if anyone has any > concrete recommendations, I would welcome them. > > When the new hardware arrives, (about a week), I will probably run some tests > with varying stripe-sizes and see what happens but any pointers towards > likely good starting points......
There's a fair discussion of stripe sizes in vinum(4), about 200 lines long, under the heading "Performance considerations". I can't do better than that in less space. What part of that don't you understand? Greg -- When replying to this message, please copy the original recipients. If you don't, I may ignore the reply or reply to the original recipients. For more information, see http://www.lemis.com/questions.html See complete headers for address and phone numbers To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-questions" in the body of the message
