On Fri, Sep 14, 2007 at 01:48:40PM -0500, Christopher Gibbs wrote: > I suspect it's probably not a good idea but I was wondering if someone > could clarify the details. > > I have 4 250G SATA(150) disks and 1 250G PATA(133) disk. Would it > cause problems if I created a raidz1 pool across all 5 drives? > > I know the PATA drive is slower so would it slow the access across the > whole pool or just when accessing that disk?
...a late reply here, but i'm slightly surprised none of the other respondents mentioned this. The PATA drive is not any slower in raw throughput than the SATA disks. a typical 250G disk has a max transfer rate of maybe 60MB/sec, so the attachment speed will not make a difference. i/o to/from the disk's cache will be marginally slower but you want to disable the write cache for data integrity anyway. If the SATA disks have NCQ, you'd lose on some random i/o workloads by adding the PATA disk. But, i think that you need SATA300 to support that feature. danno -- Dan Pritts, System Administrator Internet2 office: +1-734-352-4953 | mobile: +1-734-834-7224 _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
