Date: Sun, 8 Dec 2002 17:04:28 +0100 From: Mark Rowlands <fuc952d@tninet.se> To: questions@freebsd.org Subject: couple of vinum questions from a vinum newbie. Message-ID: <200212081704.28492.fuc952d@tninet.se>
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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...... To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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