SAN slow SAN --> local slow local --> SAN fast local --> local fast XioTech's docs say to change the queue_depth of the SAN hdisks to 8, their tech support says to change it to 40, I tried those and kept trying all the way up to 256 and saw no difference in performance. So I guess my question is, is this normal performance, or is there an issue? Thanks. [allowsmilie] => 1 [showsignature] => 0 [ipaddress] => [iconid] => 0 [visible] => 1 [attach] => 0 [infraction] => 0 [reportthreadid] => 0 [isusenetpost] => 1 [msgid] => <1116261706.677478.175400@f14g2000cwb.googlegroups.com> [ref] => [htmlstate] => on_nl2br [postusername] => TB [ip] => chessgame@gmail [isdeleted] => 0 [usergroupid] => [membergroupids] => [displaygroupid] => [password] => [passworddate] => [email] => [styleid] => [parentemail] => [homepage] => [icq] => [aim] => [yahoo] => [msn] => [skype] => [showvbcode] => [showbirthday] => [usertitle] => [customtitle] => [joindate] => [daysprune] => [lastvisit] => [lastactivity] => [lastpost] => [lastpostid] => [posts] => [reputation] => [reputationlevelid] => [timezoneoffset] => [pmpopup] => [avatarid] => [avatarrevision] => [profilepicrevision] => [sigpicrevision] => [options] => [akvbghsfs_optionsfield] => [birthday] => [birthday_search] => [maxposts] => [startofweek] => [referrerid] => [languageid] => [emailstamp] => [threadedmode] => [autosubscribe] => [pmtotal] => [pmunread] => [salt] => [ipoints] => [infractions] => [warnings] => [infractiongroupids] => [infractiongroupid] => [adminoptions] => [profilevisits] => [friendcount] => [friendreqcount] => [vmunreadcount] => [vmmoderatedcount] => [socgroupinvitecount] => [socgroupreqcount] => [pcunreadcount] => [pcmoderatedcount] => [gmmoderatedcount] => [assetposthash] => [fbuserid] => [fbjoindate] => [fbname] => [logintype] => [fbaccesstoken] => [newrepcount] => [vbseo_likes_in] => [vbseo_likes_out] => [vbseo_likes_unread] => [temp] => [field1] => [field2] => [field3] => [field4] => [field5] => [subfolders] => [pmfolders] => [buddylist] => [ignorelist] => [signature] => [searchprefs] => [rank] => [icontitle] => [iconpath] => [avatarpath] => [hascustomavatar] => 0 [avatardateline] => [avwidth] => [avheight] => [edit_userid] => [edit_username] => [edit_dateline] => [edit_reason] => [hashistory] => [pagetext_html] => [hasimages] => [signatureparsed] => [sighasimages] => [sigpic] => [sigpicdateline] => [sigpicwidth] => [sigpicheight] => [postcount] => 1 [islastshown] => [isfirstshown] => 1 [attachments] => [allattachments] => ) --> SAN slow > SAN --> local slow > local --> SAN fast > local --> local fast > > XioTech's docs say to change the queue_depth of the SAN hdisks to 8, > their tech support says to change it to 40, I tried those and kept > trying all the way up to 256 and saw no difference in performance. > > So I guess my question is, is this normal performance, or is there an > issue? > > Thanks.[/ref] Do the Fibre connections go straight from the SAN controller to the AIX box or is there a Fibre router in between? If so, perhaps it's causing the problem. Can you remove it to see if there's still a transfer bottleneck? -- DeeDee, don't press that button! DeeDee! NO! Dee... [allowsmilie] => 1 [showsignature] => 0 [ipaddress] => [iconid] => 0 [visible] => 1 [attach] => 0 [infraction] => 0 [reportthreadid] => 0 [isusenetpost] => 1 [msgid] => [ref] => <1116261706.677478.175400@f14g2000cwb.googlegroups.com> [htmlstate] => on_nl2br [postusername] => Michael [ip] => vilain@spamcop. [isdeleted] => 0 [usergroupid] => [membergroupids] => [displaygroupid] => [password] => [passworddate] => [email] => [styleid] => [parentemail] => [homepage] => [icq] => [aim] => [yahoo] => [msn] => [skype] => [showvbcode] => [showbirthday] => [usertitle] => [customtitle] => [joindate] => [daysprune] => [lastvisit] => [lastactivity] => [lastpost] => [lastpostid] => [posts] => [reputation] => [reputationlevelid] => [timezoneoffset] => [pmpopup] => [avatarid] => [avatarrevision] => [profilepicrevision] => [sigpicrevision] => [options] => [akvbghsfs_optionsfield] => [birthday] => [birthday_search] => [maxposts] => [startofweek] => [referrerid] => [languageid] => [emailstamp] => [threadedmode] => [autosubscribe] => [pmtotal] => [pmunread] => [salt] => [ipoints] => [infractions] => [warnings] => [infractiongroupids] => [infractiongroupid] => [adminoptions] => [profilevisits] => [friendcount] => [friendreqcount] => [vmunreadcount] => [vmmoderatedcount] => [socgroupinvitecount] => [socgroupreqcount] => [pcunreadcount] => [pcmoderatedcount] => [gmmoderatedcount] => [assetposthash] => [fbuserid] => [fbjoindate] => [fbname] => [logintype] => [fbaccesstoken] => [newrepcount] => [vbseo_likes_in] => [vbseo_likes_out] => [vbseo_likes_unread] => [temp] => [field1] => [field2] => [field3] => [field4] => [field5] => [subfolders] => [pmfolders] => [buddylist] => [ignorelist] => [signature] => [searchprefs] => [rank] => [icontitle] => [iconpath] => [avatarpath] => [hascustomavatar] => 0 [avatardateline] => [avwidth] => [avheight] => [edit_userid] => [edit_username] => [edit_dateline] => [edit_reason] => [hashistory] => [pagetext_html] => [hasimages] => [signatureparsed] => [sighasimages] => [sigpic] => [sigpicdateline] => [sigpicwidth] => [sigpicheight] => [postcount] => 2 [islastshown] => [isfirstshown] => [attachments] => [allattachments] => ) --> SAN performance - Linux / Unix Administration

SAN performance - Linux / Unix Administration

Hi all, System: XioTech Magnitude SAN IBM p5 550 with AIX 5.2 and a Cambex PC2000 FC card. hdisk0 is local hdisk1 is local hdisk2 is on the SAN hdisk3 is on the SAN My issue is when I copy files either from SAN hdisk to local hdisk, or one SAN hdisk to the other SAN hdisk I get about 8 MB/s transfer rate (using iostat and the monitoring of the SAN). A 1.5 MB file takes a little over 3 minutes. If I transfer that same 1.5 GB file from either local hdisk to local hdisk OR local hdisk ...

Sponsored Links
  1. #1

    Default SAN performance

    Hi all,

    System:
    XioTech Magnitude SAN
    IBM p5 550 with AIX 5.2 and a Cambex PC2000 FC card.
    hdisk0 is local
    hdisk1 is local
    hdisk2 is on the SAN
    hdisk3 is on the SAN

    My issue is when I copy files either from SAN hdisk to local hdisk, or
    one SAN hdisk to the other SAN hdisk I get about 8 MB/s transfer rate
    (using iostat and the monitoring of the SAN). A 1.5 MB file takes a
    little over 3 minutes. If I transfer that same 1.5 GB file from either
    local hdisk to local hdisk OR local hdisk to SAN hdisk, I get 40 - 60
    MB/s. The file copies in 30 to 40 seconds.
    So basically:
    SAN --> SAN slow
    SAN --> local slow
    local --> SAN fast
    local --> local fast

    XioTech's docs say to change the queue_depth of the SAN hdisks to 8,
    their tech support says to change it to 40, I tried those and kept
    trying all the way up to 256 and saw no difference in performance.

    So I guess my question is, is this normal performance, or is there an
    issue?

    Thanks.

    Sponsored Links
    TB Guest

  2. #2

    Default Re: SAN performance

    In article <googlegroups.com>,
    "TB" <com> wrote:
     

    Do the Fibre connections go straight from the SAN controller to the AIX
    box or is there a Fibre router in between? If so, perhaps it's causing
    the problem. Can you remove it to see if there's still a transfer
    bottleneck?

    --
    DeeDee, don't press that button! DeeDee! NO! Dee...



    Michael Guest

  3. #3

    Default Re: SAN performance

    Sorry, Should have mentioned that. No, there is no switch. P2P.

    TB Guest

  4. #4

    Default Re: SAN performance

    Sorry, Should have mentioned that. No, there is no switch. P2P.

    TB Guest

Similar Threads

  1. Performance monitor causes performance problems
    By Jani in forum Windows Server
    Replies: 0
    Last Post: July 15th, 08:38 AM
  2. performance AIX
    By Chandan in forum AIX
    Replies: 8
    Last Post: November 16th, 04:40 PM
  3. performance tools for yzing java performance
    By dfdashk@unix.com in forum Sun Solaris
    Replies: 6
    Last Post: August 28th, 03:40 PM
  4. Performance hit on ASP.NET
    By Jeremy in forum ASP.NET General
    Replies: 2
    Last Post: July 9th, 09:03 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139