(Enhance) Concurrent Capable and Big vg Format Volume Group in AIX Unix (°È)¸¦ µ¿½Ã Áö¿ø ¹× ÇÁ·Î¹æ½º À¯´Ð½º¿¡ Çü½Ä ºò º¼·ý ±×·ì vg
In AIX Unix operating system, when you try to create a volume group (vg) or alter and change a vg, there are options or flags of Concurrent Capable (or Enhance Concurrent Capable) and Big vg Format available. ¿¢½º À¯´Ð½º ¿î¿µ üÁ¦¿¡¼ÇÏ¸é º¼·ý ±×·ì (vg) ¶Ç´Â º¯°æ°ú º¯È¸¦ ¸¸µå´Â vg, °Å±â¿¡ ¿É¼Ç ¶Ç´Â µ¿½Ã Áö¿ø (¶Ç´Â °È µ¿½Ã Áö¿ø)¿Í ºòÀÇ Çü½Ä¿¡ ÇØ´çÇÏ´Â Ç÷¡±× vgÇÏ´Â ½ÃµµÇϽʽÿÀ. The parameters are available in mkvg (create new volume group) or chvg (change the characteristics of a volume group) commands in AIX with -c (Concurrrent Capable), -C Enhance Concurrent Capable) and -B (Big vg Format) flags, or accessible via smit or smitty system management console. mkvg ¸Å°³ º¯¼ö () chvg »õ º¼·ý ±×·ìÀ» ¸¸µé°Å³ª »ç¿ëÇÒ ¼öÀÖ½À´Ï´Ù () - C Á¶ (Concurrrent Áö¿ø), - C¸¦ °È µ¿½Ã Áö¿ø)¿Í - B Á¶ (ºò), Ç÷¡±× Çü½Ä vg¿Í ÇÁ·Î¹æ½º¿¡¼ º¼·ý ±×·ìÀÇ Æ¯¼ºÀ» º¯°æ ¸í·É ½Ã½ºÅÛ °ü¸® ÄܼÖÀ» ÅëÇØ Á¢±ÙÇÒ ¼ö ¶Ç´Â Smit ¶Ç´Â ½º¹ÌƼ.
Concurrent Capable or Enhanced Concurrent Capable volume group is a volume group that you can vary online on more than one AIX instance at a time. µ¿½Ã Capable ¶Ç´Â Çâ»óµÈ µ¿½Ã Áö¿ø º¼·ý ±×·ì º¼·ý ±×·ìÀÌ Çϳª ÀÌ»óÀÇ ÀνºÅϽº¸¦ ÇÑ ¹ø¿¡ ¿¢½º ¿Â¶óÀÎ ´Ù¸¦ ¼öÀÖ½À´Ï´Ù. Concurrent Capable option can only be used in configurations with HACMP (not for enhanced version), HACMP ES (Group Services needed to be configured prior to using enhanced version) or Oracle RAC (aka OPS). µ¿½Ã Áö¿ø ¿É¼ÇÀº HACMP¿Í ±¸¼º¿¡¼ Çâ»óµÈ ¹öÀü (¾È), HACMP ES (±×·ì ¼ºñ½º¸¦ »çÀü¿¡ °³¼±µÈ ¹öÀüÀ» »ç¿ëÇϵµ·Ï ±¸¼ºµÇ¾î¾ßÇÏ´Â µ¥ ÇÊ¿äÇÑ) ¶Ç´Â Oracle RAC (Àϸí OPS´Â) »ç¿ëÇÒ ¼öÀÖ½À´Ï´Ù. It has no effect on volume groups and systems not using these HACMP products. º¼·ý ±×·ì ¹× ½Ã½ºÅÛ¿¡ ¾Æ¹«·± ¿µÇâÀÌ HACMP Á¦Ç°À» »ç¿ëÇÏÁö ¾Ê¾Ò´Ù. A Concurrent Capable volume group is only supported on Serial DASD and SSA disks, while Enhanced Concurrent Capable volume group is supported on all other disk types. Çâ»óµÈ µ¿½Ã º¼·ý ±×·ìÀ» Áö¿øÇÏ¸é¼ ´Ù¸¥ ¸ðµç µð½ºÅ© À¯Çü¿¡ Áö¿øµÇ´Â µ¿½Ã Áö¿ø º¼·ý ±×·ì¿¡¸¸ Á÷·Ä DASD ¹× Ư¼ö ¿ä¿ø µð½ºÅ©¿¡¼ Áö¿øµË´Ï´Ù. Only Enhanced Concurrent Capable supports volume group running with a 64 bit kernel. Çâ»óµÈ µ¿½Ã º¼·ý ±×·ì¿¡¸¸ Áö¿øÀ» Áö¿øÇÏ´Â 64 ºñÆ® Ä¿³ÎÀ» ½ÇÇàÇϰíÀÖ´Ù.
Big vg Format meanwhile supports volume group with up to 128 physical volumes and 512 logical volumes. ÇÑÆí ÃÖ´ë 128 ÇüÅ ū vg ¹°¸® º¼·ý°ú º¼·ý ±×·ì 512 °³ ³í¸®Àû º¼·ýÀ» ÇÔ²² Áö¿øÇÑ´Ù. If you want to create a Big vg Format volume group, it¡¯s best that you create the volume group with the setting selected, instead of trying to edit and change to volume group to support Big Format later on, as there are a lot of conditions to take care of and fulfill: ¸¸¾à ´ç½ÅÀÌ Å« vg Çü½Ä º¼·ý ±×·ìÀ» ¸¸µé·Á¸é, ±×°ÍÀ» ÃÖ°í·Î ¸¹ÀÌÇÏ´Â °æ¿ì¿¡´Â ¼³Á¤À» ¼±ÅÃÇϸé, ´ë½Å ÆíÁýÇÏ·Á°í ³ë·ÂÇÏ°í º¼·ý ±×·ìÀ» º¯°æ ³ªÁß¿¡ Å« Æ÷¸ËÀ» Áö¿ø°ú ÇÔ²², º¼·ý ±×·ìÀ» ¸¸µé°í ÀÖ¾î¿ä Á¶°ÇÀÇ Ã³¸® ¹× ÀÌÇà :
- The -B flag cannot be used if there are any stale physical partitions or there are any open logical volumes in the volume group. ¾î¶² °æ¿ì¿¡´Â ¿À·¡µÈ ¹°¸®Àû ÆÄƼ¼ÇÀ̳ª º¼·ý ±×·ì¿¡ ÀÖ°í ¿·ÁÀÖ´Â ³í¸® º¼·ýÀÖ´Â - B È£ Ç÷¡±×¸¦ »ç¿ëÇÒ ¼ö¾ø½À´Ï´Ù.
- Once the volume group is converted, it cannot be imported into AIX 4.3.1 or lower versions. ÀÏ´Ü º¼·ý ±×·ìÀ¸·Î º¯È¯µË´Ï´Ù, ¿¢½º 4.3.1 ¶Ç´Â ³·Àº ¹öÀüÀ¸·Î °¡Á®¿Ã ¼ö¾ø½À´Ï´Ù.
- The -B flag cannot be used if the volume group is varied on in concurrent mode. µ¿½Ã ¸ðµå¿¡ÀÖ´Â °æ¿ì º¼·ý ±×·ì¿¡ ´Ù¾ç - B Á¶ ±ê¹ßÀ» »ç¿ëÇÏ½Ç ¼ö¾ø½À´Ï´Ù.
- There must be enough free partitions available on each physical volume for the VGDA expansion for this operation to be successful. ÀÌ¹Ì ÃæºÐÈ÷ ÀÖ¾î¾ß ¹«·á·Î ÆÄƼ¼ÇÀÌ ÀÛ¾÷À» À§ÇØ VGDA È®Àå¿¡ ´ëÇÑ °¢ ¹°¸®Àû º¼·ý¿¡ ÇØ´çÇÏ´Â ¼º°øÇÒ ¼öÀÖ´Ù.
- Since the VGDA resides on the edge of the disk and it requires contiguous space for expansion, the free partitions are required on the edge of the disk. ÀÌÈÄ VGDA µð½ºÅ©ÀÇ °¡ÀåÀÚ¸®¿¡ÀÖ´Â ¹× È®ÀåÀ» À§ÇØ ¿¬¼ÓµÈ °ø°£ÀÌ ÇÊ¿äÇÕ´Ï´Ù, ÀÚÀ¯ ÆÄƼ¼ÇÀ» µð½ºÅ©ÀÇ °¡ÀåÀÚ¸®¿¡ ÇÊ¿äÇÕ´Ï´Ù. If those partitions are allocated for user usage, they will be migrated to other free partitions on the same disk. ±× ÆÄƼ¼Ç¿¡ ÇÒ´çµÈ »ç¿ëÀÚ°¡ »ç¿ëÇϰíÀÖ´Ù¸é, ±×µéÀº ´Ù¸¥ ¹«·á ÆÄƼ¼Ç¿¡ µ¿ÀÏÇÑ µð½ºÅ©¿¡ ¸¶ÀÌ ±× ·¹À̼ǵ˴ϴÙ. The rest of the physical partitions will be renumbered to reflect the loss of the partitions for VGDA usage. ½ÇÁ¦ ÆÄƼ¼ÇÀÇ ³ª¸ÓÁö VGDA »ç¿ë¿¡ ´ëÇÑ ÆÄƼ¼ÇÀÇ ¼Õ½ÇÀ» ¹Ý¿µÇϵµ·Ï renumberedµË´Ï´Ù. This will change the mappings of the logical to physical partitions in all the PVs of this VG. ÀÌ VGÀÇ ¸ðµç º£Æ®³² ÈÄ ÁõÈıº¿¡ ¹°¸®ÀûÀ¸·Î ³í¸® ÆÄƼ¼ÇÀÇ ¸ÅÇÎÀ» º¯°æµË´Ï´Ù. If you have saved the mappings of the LVs for a potential recovery operation, you should generate the maps again after the completion of the conversion operation. ¸¸¾à ´ç½ÅÀÌ ÀáÀçÀûÀÎ º¹±¸ ÀÛ¾÷À»À§ÇÑ Á¤¸Æ ÁÖ»çÀÇ ¸ÅÇÎÀ» ±¸ÇØ °¡Áö°í, ´Ù½Ã Àüȯ ÀÛ¾÷ÀÇ ¿Ï·á ÈÄ¿¡Áöµµ¸¦ »ý¼ºÇؾßÇÑ´Ù. Also, if the backup of the VG is taken with the map option and you plan to restore using those maps, the restore operation may fail since the partition number may no longer exist (due to reduction). ¶ÇÇÑ, ¸¸¾à VGÀÇ ¹é¾÷ ¿É¼Ç°ú ÇÔ²² ÂïÀºÁöµµÇÏ°í ±×Áöµµ¸¦ »ç¿ëÇÏ¿© º¹¿øÇÏ´Â °èȹ ÀÌÈÄ ÆÄƼ¼Ç ¹øÈ£¸¦ ´õ ÀÌ»ó (°¨¼Ò)À¸·Î Á¸ÀçÇÒ ¼öÀÖ½À´Ï´Ù º¹¿ø ÀÛ¾÷ÀÌ ½ÇÆÐÇÒ ¼öÀÖ½À´Ï´Ù. It is recommended that backup is taken before the conversion, and right after the conversion if the map option is utilized. ±×°ÍÀº Àüȯ Àü¿¡ ÂïÀºÀ̸ç, ±ÇÀåµÇ´Â ¹é¾÷ Àüȯ Á÷ÈÄÁöµµ ¿É¼ÇÀ» Ȱ¿ëÇÏ´Â °æ¿ìÀÌ´Ù. Since the VGDA space has been increased substantially, every VGDA update operation (creating an LV, changing an LV, adding a PV, and so forth) may have a considerably longer duration. ÀÌÈÄ VGDA °ø°£À» ½ÇÁúÀûÀ¸·Î, ¸ðµç VGDA ¾÷µ¥ÀÌÆ® ÀÛ¾÷ (LV´Â ÀÛ¼º, LV´Â º¯ÈÇϰí, ±×·¸°Ô °¡´Â°Ô PV¸¦ Ãß°¡) »ó´çÈ÷ ±ä ±â°£ÀÌÀÖÀ» ¼öÀÖ½À´Ï´Ù Áõ°¡µÇ¾ú½À´Ï´Ù.
- A big VG only supports Enhanced Concurrent Capable. Å« VG µ¿½Ã Áö¿ø °È¸¸À» Áö¿øÇÕ´Ï´Ù.
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