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04-19-2008, 06:24 AM
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 DOC: Wal update I add few sentences how to write cache works on Solaris platform. Zdenek ---------------------------(end of broadcast)--------------------------- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq      |
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04-19-2008, 06:24 AM
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| Re: DOC: Wal update Zdenek Kotala wrote: > I add few sentences how to write cache works on Solaris platform. I have updated our documentation with the attached patch. I was able to verify all the information in this change. I changed your original wording because the statement that UFS turns off write cache seemed unclear because the file system seems independent of the disk write cache. (What happens if you have UFS and ZFS on the same drive?) Anyway I think the attached wording is fine. -- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB http://postgres.enterprisedb.com + If your life is a hard drive, Christ can be your backup. + ---------------------------(end of broadcast)--------------------------- TIP 4: Have you searched our list archives? http://archives.postgresql.org |
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04-19-2008, 06:25 AM
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| Re: DOC: Wal update Bruce Momjian wrote: > Zdenek Kotala wrote: >> I add few sentences how to write cache works on Solaris platform. > > I have updated our documentation with the attached patch. I was able to > verify all the information in this change. Thanks. > I changed your original wording because the statement that UFS turns off > write cache seemed unclear because the file system seems independent of > the disk write cache. (What happens if you have UFS and ZFS on the same > drive?) You are right UFS does not modify (write) cache setting and it is usually disabled by default on most disks. If ZFS and UFS are on same disk, than ZFS don't enable disk cache. It is a reason why put ZFS on separate disk is better. See http://www.solarisinternals.com/wiki...#Storage_Pools > Anyway I think the attached wording is fine. Yes, it is. Zdenek PS: There are some articles about ZFS. http://www.solarisinternals.com/wiki...ractices_Guide http://www.solarisinternals.com/wiki...l_Tuning_Guide http://www.solarisinternals.com/wiki..._for_Databases ---------------------------(end of broadcast)--------------------------- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq |
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04-19-2008, 06:25 AM
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| Re: DOC: Wal update Zdenek Kotala wrote: > Bruce Momjian wrote: > > Zdenek Kotala wrote: > >> I add few sentences how to write cache works on Solaris platform. > > > > I have updated our documentation with the attached patch. I was able to > > verify all the information in this change. > > Thanks. > > > I changed your original wording because the statement that UFS turns off > > write cache seemed unclear because the file system seems independent of > > the disk write cache. (What happens if you have UFS and ZFS on the same > > drive?) > > You are right UFS does not modify (write) cache setting and it is usually > disabled by default on most disks. If ZFS and UFS are on same disk, than ZFS > don't enable disk cache. It is a reason why put ZFS on separate disk is better. See > http://www.solarisinternals.com/wiki...#Storage_Pools > > > Anyway I think the attached wording is fine. > > Yes, it is. > > Zdenek > > PS: There are some articles about ZFS. > > http://www.solarisinternals.com/wiki...ractices_Guide > http://www.solarisinternals.com/wiki...l_Tuning_Guide > http://www.solarisinternals.com/wiki..._for_Databases > > ---------------------------(end of broadcast)--------------------------- > TIP 3: Have you checked our extensive FAQ? > > http://www.postgresql.org/docs/faq -- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB http://postgres.enterprisedb.com + If your life is a hard drive, Christ can be your backup. + ---------------------------(end of broadcast)--------------------------- TIP 5: don't forget to increase your free space map settings |
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